Residential Gas Water Heater - AO Smith
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Installa on Instruc ons and
Use & Care Guide
Residential Gas
Water Heater
Residen al Atmospheric Ultra Low Nox Gas Water Heater
with the Flammable Vapor Igni on Resistant Safety System
DO NOT RETURN THIS UNIT TO THE STORE WARNING: If the informa on in
Read this manual and the labels on the water heater before you install, these instruc ons is not followed
operate, or service it. If you have difficulty following the direc ons, or exactly, a fire or explosion may
aren’t sure you can safely and properly do any of this work yourself: result causing property damage,
personal injury or death.
• Call our Technical Assistance Hotline at 1-877-817-6750 or visit h p://
www.AOSmithAtLowes.com. We can help you with installa on, opera ons, Do not store or use gasoline or other
troubleshoo ng, or maintenance. Before you call, write down the model and flammable vapors and liquids in the
serial number from the water heater’s data plate. vicinity of this or any other appliance.
• Incorrect installa on, opera on, or service can damage the water heater, your WHAT TO DO IF YOU SMELL GAS
house and other property, and present risks including fire, scalding, electric • Do not try to light any appliance.
shock, and explosion, causing serious injury or death. • Do not touch any electrical switch;
do not use any phone in your build-
ing.
• Immediately call your gas supplier
from a neighbor’s phone. Follow the
gas supplier’s instruc ons.
• If you cannot reach your gas sup-
Table of Contents Page plier, call the fire department.
IMPORTANT SAFETY INFORMATION ............................................. 3 Installa on and service must be per-
GETTING STARTED ........................................................................ 7 formed by a qualified installer, service
agency or the gas supplier.
INSTALLATION ............................................................................. 14
OPERATION ................................................................................. 23
TROUBLESHOOTING ................................................................... 25
MAINTENANCE ........................................................................... 28
NOTES ......................................................................................... 31 LOW LEAD
REPAIR PARTS ............................................................................. 35 CONTENT
Keep this manual in the pocket on heater for future reference whenever maintenance, adjustment or service is required.
Retain your original receipt as proof of purchase.
100307708_2000560173_(REV. B)
January 2020COMPLETED INSTALLATION TYPICAL
Vent
pipe Cold water
shut off
Expansion
tank
(Connect to
Hot cold water
water supply)
line
Cold
water
Dra hood line
T&P
relief
valve
T&P
discharge
pipe
Gas supply
shut off
Drain valve
Gas supply
Drain pan
discharge
pipe
Gas control
valve/thermostat
Sediment Trap Metal drain panIMPORTANT SAFETY INFORMATION
SAFETY
Read and follow all safety messages and instruc ons in
Important informa on to keep
this manual.
Fill out this sec on and keep this
manual in the pocket of the water
This is the safety alert symbol. It is used to alert you to heater for reference.
poten al physical injury hazards. Obey all safety mes-
sages that follow this symbol to avoid possible property Date Installed:
damage, serious injury or death. Do not remove any
permanent instruc ons, labels, or the data plate from either the outside of
the water heater or on the inside of the access panels. Keep this manual
Model number:
near the water heater.
Serial number:
DANGER indicates hazardous situa-
DANGER on that, if not avoided, will result
in death or serious injury. Maintenance performed:* Date:
WARNING indicates a hazardous
WARNING situa on that, if not avoided, could
result in death or serious injury.
CAUTION indicates a hazardous
CAUTION situa on that, if not avoided, could
result in minor or moderate injury.
NOTICE indicates prac ces not
NOTICE related to physical injury.
WARNING! If the informa on in these instruc ons is not followed exactly,
a fire or explosion may result causing property damage, personal injury or
death. Do not store or use gasoline or other flammable vapors and liquids in
the vicinity of this or any other appliance.
*Drain and flush tank and remove and
An odorant is added by the gas supplier to the gas used by this water heater. inspect anode rod a er first six months
This odorant may fade over an extended period of me. Do not depend upon of opera on and at least annually
this odorant as an indica on of leaking gas. We recommend installing a fuel gas therea er. Operate the Temperature
and carbon monoxide detector. and Pressure Relief Valve (T&P) annu-
ally and inspect T&P valve every 2-4
years (see the label on the T&P valve for
maintenance schedule). If no label is
a ached to the T&P Relief Valve, follow
the instruc ons in the T&P Relief Valve
Maintenance sec on of this manual.
See the Maintenance sec on for more
informa on about maintaining this
water heater.
Residen al Ultra Low NOx Gas Water Heater Use and Care Guide • 3IMPORTANT SAFETY INFORMATION
SAFETY
T o reduce the risk of property
damage, serious injury or death,
read and follow the precau ons below,
Gas Pressure
WARNING! The gas supply pressure
must not exceed the maximum supply
Table 1
Time to Produce
Temperature a Serious Burn
all labels on the water heater, and pressure as stated on the water
the safety messages and instruc ons heater’s data plate. The minimum 120°F (49°C) More than 5 minutes
throughout this manual. supply pressure is for the purpose of
input adjustment. L.P. gas supply 125°F (52°C) 1½ to 2 minutes
RISKS DURING pressure must not exceed 13” water 130°F (54°C) About 30 seconds
column. Have a qualified person
INSTALLATION AND (licensed plumber, gas company 135°F (57°C) About 10 seconds
MAINTENANCE personnel, or authorized service
technician) check for proper L.P. gas 140°F (60°C) Less than 5 seconds
Li ing Risk
pressure. L.P. gas pressures exceeding
145°F (63°C) Less than 3 seconds
WARNING! The 13” water column can result in serious
water heater is heavy. injury or death from explosion or fire. 150°F (66°C) About 1½ seconds
Follow these precau-
ons to reduce the RISKS DURING 155°F (68°C) About 1 second
risk of property damage, injuries from OPERATION For informa on about changing the
li ing or impact injuries from dropping
Scalding Risk factory temperature se ng, refer to
the water heater.
the “Adjus ng the Temperature” sec-
• Use at least two people to li the This water heater on in this manual .
water heater. can make water hot Even if you set the water heater’s gas
• Be sure you both have a good grip enough to cause severe burns instantly, control valve to a low se ng, higher
before li ing. resul ng in severe injury or death. water temperatures may occur in cer-
• Use an appliance dolly or hand • Feel water before bathing or tain circumstances:
truck to move the water heater. showering. • In some cases, repeated small draws
• To reduce the risk of scalding,
of water can cause the hot and cold
install Thermosta c Mixing Valves
water in the tank to “stack” in layers.
(temperature limi ng valves) at
Explosion Risk If this happens, the water can be as
each point-of-use. These valves
much as thirty degrees ho er than
automa cally mix hot and cold
WARNING! Read the water heater’s the gas control valve se ng. This
water to limit the temperature at
data plate to determine the type of temperature varia on is the result
the tap. Mixing valves are available
gas required. Failure to follow these of your usage pa ern and is not a
from Lowe’s®. Follow manufac-
instruc ons can result in serious injury malfunc on.
turer’s instruc ons for installa on
or death from explosion, fire or • Water temperature will be ho er if
and adjustment of the valves.
carbon monoxide poisoning. • The gas control valve on this water someone adjusted the gas control
heater has been factory set to its valve to a higher se ng.
• Do not connect a natural gas water
lowest se ng to reduce the risk • Problems with the gas control valve
heater to an L.P. gas supply.
of scalding. Higher temperatures or other malfunc ons may result in
• Do not connect an L.P. gas water increase the risk of scalding, but higher than expected water tem-
heater to a natural gas supply. even at 120°F, hot water can scald. peratures.
• Use a new CSA approved gas If you choose a higher tempera- • If the water heater is in a hot envi-
supply line. ture se ng, Thermosta c Mixing ronment, the water in the tank can
• Install a shut-off valve on the gas Valves located at each point-of-use become as hot as the surrounding
supply line. are par cularly important to help air, regardless of the temperature
avoid scalding. se ng.
4 • Residen al Ultra Low NOx Gas Water Heater Use and Care GuideIMPORTANT SAFETY INFORMATION
SAFETY
• If the water supplied to the water Fire Risk heater itself can damage property
heater is pre-heated (for example, and could cause a fire risk). If the
by a solar system) the temperature This water heater is water heater is subjected to flood
in the tank may be higher than the equipped with a Flam- condi ons or the thermostat(s) have
water heater’s temperature se ng. mable Vapor Igni on been submerged in water, the en re
• Should overhea ng occur or the Resistance (FVIR) system. water heater must be replaced.
burner fail to shut off, turn off the FVIR is designed to reduce the risk of
• Replace the water heater’s viewport
manual gas supply valve to the water flammable vapor-related fires. FVIR
if glass is missing or damaged. Repair
heater and call a qualified person. makes this product more sensi ve to
the combus on chamber door seals
installa on errors or improper installa-
To reduce the risk of unusually hot wa- if damaged.
on environments. The FVIR system will
ter reaching the fixtures in the house,
not prevent a possible fire/explosion if Explosion Risk
install Thermosta c Mixing Valves at
the igniter is depressed and flammable
each point-of-use. High temperatures and
vapors have accumulated in the combus-
If anyone in your home is at par cular on chamber with the pilot light off. pressures in the water
risk of scalding (for example, the elder- heater tank can cause an explosion re-
ly, children, or people with disabili es) Do not a empt to light this appliance, sul ng in property damage, serious in-
or if there is a local code or state law or depress the igniter bu on, if you jury or death. A new Temperature and
requiring a certain water temperature suspect flammable vapor have accumu- Pressure (T&P) Relief Valve is included
at the hot water tap, these precau ons lated inside or outside the appliance. with your water heater to reduce risk
are par cularly important. Immediately call a qualified person to of explosion by discharging hot water.
According to a na onal standard (ASSE inspect the appliance. Water heaters Addi onal temperature and pressure
1070) and many local plumbing codes, subjected to a flammable vapors inci- protec ve equipment may be required
the water heater’s gas control valve dent will show a discolora on on the by local codes.
should not be used as the sole means flame arrestor and require replacement
of the en re water heater. Improper A na onally recognized tes ng labo-
to regulate water temperature and
installa on or an inadequate air supply ratory maintains periodic inspec on
avoid scalds.
can also cause the FVIR system to dis- of the valve produc on process and
Properly adjusted Thermosta c Mixing cer fies that it meets the requirements
able the water heater.
Valves installed at each point-of-use al- for Relief Valves for Hot Water Supply
low you to set the tank temperature to To reduce the risk of a fire that could Systems, ANSI Z21.22. The T&P Relief
a higher se ng without increasing risk destroy your home and seriously injure Valve’s relief pressure must not exceed
of scalds. A higher temperature se ng or kill people: the working pressure ra ng of the wa-
allows the tank to provide much more ter heater as stated on the ra ng plate.
• Do not store things that can burn
hot water and can help provide proper
easily such as paper or clothes next
water temperatures for appliances such Maintain the T&P Relief Valve properly.
to the water heater.
as dishwashers and washing machines. Follow the maintenance instruc ons
Higher tank temperatures (140°F) • Do not store or use gasoline or other provided by the manufacturer of the
also kill bacteria that cause a condi- flammable substances in the vicinity T&P Relief Valve (label a ached to T&P
on known as “smelly water” and can of this or any other appliance. Relief Valve). If no label is a ached to
reduce the levels of bacteria that cause • Keep the water heater from becom- the T&P Relief Valve, follow the instruc-
water-borne diseases. ing wet. Immediately shut the water ons in the T&P Relief Valve Main-
Water Contamina on Risk heater off and have it inspected by a tenance sec on of this manual. An
qualified person if you find that the explosion could occur if the T&P Relief
Do not use chemicals that could con-
wiring, thermostat(s) or surround- Valve or discharge pipe is blocked. Do
taminate the potable water supply. Do
ing insula on have been exposed not cap or plug the T&P Relief Valve or
not use piping that has been treated
to water in any way (e.g., leaks from discharge pipe.
with chromates, boiler seal, or other
chemicals. plumbing, leaks from the water
Residen al Ultra Low NOx Gas Water Heater Use and Care Guide • 5IMPORTANT SAFETY INFORMATION
SAFETY
Fire and Explosion Risk if Hot Water is • Do not install this water heater in Installa on Accessories
Not Used for Two Weeks or More. a mobile home or manufactured
housing.
CAUTION! Hydrogen gas builds up
in a hot water system when it is not • Failure to follow these instruc-
used for a long period (two weeks or ons can result in serious injury
more). Hydrogen gas is extremely or death from carbon monoxide
flammable. If the hot water system poisoning.
has not been used for two weeks or Burn Risk
more, open a hot water faucet for
several minutes at the kitchen sink This water heater’s vent-
before using any electrical appliances ing system can become
connected to the hot water system. If hot enough to burn. Do not touch the
Figure 1 - Gas Water Heater Hook-Up Kit
hydrogen is present there will ven ng system while water heater is
probably be an unusual sound such as on, or un l the water heater is turned
“air” escaping through the pipe as hot off and the ven ng allowed to cool.
water begins to flow. Do not smoke or
have an open flame or other igni on
source near the faucet while it is
open.
Carbon Monoxide Risk
WARNING! This water heater
operates by burning gas. Carbon
monoxide is a colorless, odorless, gas Figure 2 - Install a Pressure Reducing Valve set
to 50 to 60 PSI.
that is a by-product of burning of fuels
such as coal, wood, charcoal, oil,
kerosene, propane, and natural gas.
Breathing excessive and abnormal
amounts of carbon monoxide can
cause carbon monoxide poisoning,
resul ng in serious
injury or death. This
water heater must
be supplied with
adequate combus-
on air and must be properly vented
to the outdoors. Have a qualified
person (licensed plumber, authorized
gas company personnel, or authorized
service technician) install the ven ng
system using these installa on
instruc ons. When the installa on is
complete, check the vent’s dra using
the instruc ons on pages 23-24.
• Install a fuel gas and carbon mon-
oxide detector in the living areas
of your home.
6 • Residen al Ultra Low NOx Gas Water Heater Use and Care GuideGETTING STARTED
Review all of the instruc ons Massachuse s code requires this water • Thermosta c Mixing Valves at each
1 before you begin work. If you heater to be installed in accordance point-of-use.
aren’t sure that you can safely with Massachuse s 248-CMR 2.00 and • Fuel gas and carbon monoxide
and properly do this work yourself, call 248-CMR 5.00: State Plumbing Code. detector.
your Lowe’s® store to arrange for Other local and state authori es may
Professional Installa on (you may also
Combus on and
have similar requirements or other
call a qualified person of your choice, codes applicable to the installa on of Ven la on Air Supply
GETTING STARTED
such as a licensed plumber, to have the this water heater. Before installing the water heater, you
work done). Improper installa on can must determine the amount of air
damage the water heater, your home Before you start, be sure you
needed to supply this water heater
and other property, and can present
3 have the following tools and
and any other gas appliances in the
risks of serious injury or death. supplies:
same area and provide adequate air for
• Common plumbing tools (depend- combus on and ven la on. Consult a
This water heater is design- ing on what type of water pipes qualified person if you’re unsure of the
2 cer fied by CSA Interna onal you have). proper way to supply air to your water
as a Category I, non-direct • Thread sealan tape or pipe joint heater.
vented water heater which takes its compound approved for potable
combus on air either from the installa- WARNING! This gas water heater
water. requires an adequate source of clean
on area or from air ducted to the unit • For homes with copper pipes,
from the outside. This water heater air for combus on and ven la on.
you may purchase a Gas Water Without sufficient air, your water
must be installed according to all local Heater Hook-Up Kit (available from
and state codes or, in the absence of heater will have frequent pilot outages
Lowe’s®) with compression fi ngs and may emit excessive and abnormal
local and state codes, the “Na onal that don’t require soldering. This
Fuel Gas Code”, ANSI Z223.1(NFPA amounts of carbon monoxide.
kit includes two 12” flex water
54)-current edi on. This is available Before beginning:
lines, two compression fi ngs, an
from the following: 18” flexible gas line, two nipples, Calculate total BTU/HR ra ng of all ap-
and thread sealant tape. pliances.
CSA America, Inc.
8501 East Pleasant Valley Road • For homes with plas c pipe, use To calculate the combus on air and
Cleveland, OH 44131 threaded connectors suitable for ven la on required, add up the total
the specific type of plas c pipe BTU/HR ra ngs of all gas burning ap-
Na onal Fire Protec on Associa on used: CPVC or PEX (cross-linked pliances (e.g., water heaters, furnaces,
1 Ba erymarch Park polyethylene). Do not use PVC clothes dryers) in the same area.
Quincy, MA 02269 pipe. Your water heater’s BTU/HR ra ng is on
• Non-corrosive gas leak detec on the data plate, located next to the gas
Check with local code officials about solu on made from hand dish- control valve/thermostat. The BTU/HR
codes governing this installa on. Have washing soap mixed with water (1 ra ngs should be on the other appli-
your installa on inspected by a code part soap to 15 parts water) or chil- ances’ data plates. If you have trouble
official to ensure the installa on meets dren’s soap bubbles and a small, determining the BTU/HR ra ngs,
all local codes. so -bristled brush. contact the manufacturer or have a
• An appliance dolly or hand truck to qualified person determine the ven la-
NOTICE: If you lack the necessary skills
move the water heater. on requirements. NOTICE: If you are
required to properly install this water
Recommended Accessories: replacing your old water heater with
heater, or you have difficulty follow-
ing the instruc ons, you should not • A metal drain pan. one that has a higher BTU/HR ra ng,
proceed but have a qualified person • Automa c water leak detec on the amount of ven la on required may
perform the installa on of this water and shut-off device. be greater.
heater. • Pressure Reducing Valve.
• Thermal Expansion Tank.
Residen al Ultra Low NOx Gas Water Heater Use and Care Guide • 7GETTING STARTED
Example: Op on A: Installa on without Check for Chemicals:
Gas Burning Appliance BTU/HR Ra ng outside ven la on (not recom- Installa ons where corrosive chemi-
Gas Water Heater 40,000
mended) cals may be present require outside
Furnace 75,000 Ven la on with outside air is recom- air. Air for combus on and ven la on
Dryer 20,000 mended for all installa ons. Even if must be clean and free of corrosive or
the water heater is installed in a large, acid-forming chemicals such as sulfur,
open room inside the house, outdoor fluorine, and chlorine. Ven la on with
GETTING STARTED
air is usually needed because modern outside air will reduce these chemicals,
Total 135,000
homes are very ghtly sealed and but it may not completely eliminate
Your Appliances: o en do not supply enough air to the them. Failure due to corrosive chemi-
Gas Burning Appliance BTU/HR Ra ng water heater. However, when installed cals is not covered by the warranty.
Gas Water Heater in a large indoor space, it may be pos- Examples of loca ons that require
sible to provide enough air without outside air due to chemicals include:
outside ven la on. If you are unsure if • Beauty salons
your installa on loca on has enough
• Photo processing labs
ven la on, contact your local gas
u lity company or code officials for a • Indoor pools
Total • Laundry, hobby, or cra rooms
safety inspec on.
Table 2 provides examples of minimum The following instruc ons will help de- • Chemical storage areas
square footage (area) required for termine if it may be possible to install Products such as aerosol sprays, de-
various BTU/HR totals. Areas used for without outside ven la on. Even if tergents, bleaches, cleaning solvents,
storage or which contain large objects this may be possible, you will need to gasoline, air fresheners, paint and
containing less air than is assumed for conduct the vent dra test on pages varnish removers, and refrigerants
the room sizes in Table 2 – see Op on 23-24 when installa on is finished. If should not be stored or used near the
A for more specific calcula ons. there is not enough ven la on, you water heater.
will need to ven late with outside air.
A1: Calculate the air volume of
the room
Table 2
Air requirements depend on the size of
BTU/HR Minimum Square Typical Room the room.
Input Feet with 8’ Ceiling with 8’ Ceiling Floor Area (Square feet) X Ceiling
Height (feet) = Room Volume (cubic
30,000 188 9 x 21
feet)
45,000 281 14 x 20 If there are large objects in the room
(e.g., refrigerator, furnace, car), sub-
60,000 375 15 x 25 tract their volume from the volume of
the room to get a be er es mate of
75,000 469 15 x 31
the air available.
90,000 563 20 x 28 Room Volume – Object Volume = Air
Volume
105,000 657 20 x 33
120,000 750 25 x 30
135,000 844 28 x 30
8 • Residen al Ultra Low NOx Gas Water Heater Use and Care GuideGETTING STARTED
A2: Calculate required air volume mum free area is sized according to Table may be adequate).
A water heater installed in an unconfined
3. Two openings must be used when B3: Determine minimum free
a c or garage requires that the space
ven la ng with air from another room. area required for each vent
be at least 50 cubic feet per 1,000 BTU/ The outside air can be taken from a opening
HR of the total input for all gas burning crawl space or a c open to the out- The size of the vent openings depends
appliances in the same area. doors and adequately ven lated. You on the total BTU/HR ra ng of all appli-
may use ver cal or horizontal ducts. ances in the space (use your calcula on
[Total BTU/HR/1000] x 50 = Cubic feet
GETTING STARTED
of air required. from “Before beginning”) and the type
B2: Determine type of ven la-
of vent used. Table 3 provides the mini-
Example: on
mum free area for each vent opening
(135,000 / 1000) x 50 = 6,750 There are several types of ven la on depending on the type of ven la on.
If the air volume of the room is less that can be used :
than the required air volume, you must 1. Direct to outdoors B4: Calculate minimum size of
provide two permanent outside air vent openings and ducts
2. Ver cal ducts
openings that draw in sufficient air. Use 3. Horizontal ducts The vent cross-sec onal area needed to
Op on B. 4. Single opening (not recom- provide the free area depends on the
If the air volume of the room is greater mended; must be at least 100 covering on the vent openings. Typical
than the required air volume, it may square inches. Not appropriate vents use louvers or grilles to protect
be possible to install the water heater for confined spaces smaller than the opening. The louver or grill itself
without outside ven la on. 50 cubic feet per 1,000 BTU/HR as blocks some of the free area, so the
calculated in sec on A or when opening may need to be larger to meet
A3: Check that combus on ven- the minimum free area requirements.
la on is adequate ge ng air from another room.)
5. From a larger room inside the Use the following formula to calculate
Because modern homes are o en well-
house (not recommended – refer the required cross-sec onal area:
sealed to prevent dra s, even a large
room may not provide enough combus- to sec on A above to determine if Cross-sec onal area = minimum free
on air without ven la on. To con- the combined volume of the rooms area required ÷ percent free area of
firm that your installa on has enough Table 3
combus on air, conduct the vent dra
test on pages 23-24 when installa on is Minimum Free Area of Permanent Openings for Ven la on and Combus on Air
finished. Supply – All Air from Outdoors Only.
Op on B: Install with outside Based on the total BTU/HR input ra ng for all gas burning appliances within a
ven la on confined space.
Ven la on with outside air is recom-
Opening Source Minimum Free Area
mended, and, for most installa ons, is
Per Opening (sq. in.)
needed. There may be exis ng ven la-
on that is adequate, or you may need *Direct to outdoors 1 sq. in. per 4,000 BTU/HR (see figure on page 10)
to add more ven la on.
Ver cal ducts 1 sq. in. per 4,000 BTU/HR (see figure on page 10)
Supplying outside air typically requires
two openings. One opening must be Horizontal ducts 1 sq. in. per 2,000 BTU/HR (see figure on page 10)
within 12 inches from the floor and
the second opening must be within 12 Single Opening 1 sq. in. per 3,000 BTU/HR (see figure on page 10)
inches from the ceiling. Although a single
*These openings connect directly with the outdoors through a ven lated a c, a
opening is not preferred, you may use a
ven lated crawl space, or through an outside wall.
single opening to outside air if the mini-
Residen al Ultra Low NOx Gas Water Heater Use and Care Guide • 9GETTING STARTED
covering (in decimals – e.g., 60% = .6) B5: Check that air source is
For example, an installa on area that clean and free of chemicals
requires openings with 100 square Air for combus on and ven la on
inches of free area would need 134 must be clean and free of corrosive
square inch openings if using metal or flammable chemicals. A failure due
louvers rated at 75% free area (100 sq. to corrosive chemicals in the air is not
in. ÷ .75 = 134 sq. in.). covered by the warranty. Combus-
GETTING STARTED
If you do not know the % free area for on air must be free of acid-forming
your louver or grill, use the following chemicals such as sulfur, fluorine, and
values: chlorine. Be sure that air at the vent
Figure 5 - Horizontal duct openings
inlets is free of such chemicals.
• For wood louvers or grilles: 20%
• For metal louvers or grilles: 60% B6: Check that combus on
Follow these rules to ensure that vents ven la on is adequate
and ducts provide adequate air flow: To confirm that your installa on has
• Each vent opening must be no enough combus on air, conduct the
smaller than 100 square inches . vent dra test on pages 23-24 when
installa on is finished.
• Ducts must have the same cross-
sec onal area as free area of the
Combus on Air Supply Op ons
opening. Figure 6 - Single opening
• Rectangular ducts must have a
minimum dimension of no less
than three inches .
• All screens must have mesh ¼” or
larger.
• Moveable louvers must be locked
open or interconnected with the
equipment so that they open au-
toma cally during opera on.
• Keep louvers and grills clean and Figure 3 - Direct to outdoors openings
free of debris or other obstruc-
ons.
Figure 4 - Vertical duct openings
10 • Residen al Ultra Low NOx Gas Water Heater Use and Care GuideGETTING STARTED
Ven ng Installing a New Vent System install without dips or sags with an
upward slope of at least ¼ inch per
WARNING! Carbon Monoxide The vent pipe must meet the following foot. Install pipe avoiding unnecessary
Hazard. This water heater must be specifica ons: bends. Pipe joints must be fastened by
supplied with adequate air and vented sheet metal screws or other approved
to outdoors. The vent system must be Type of Material
means. Support the pipe to maintain
installed by a qualified person. UL listed Type B double wall or single
clearances and to avoid separa on of
Examples of a qualified person include wall metal vent pipe must be used.
GETTING STARTED
joints or other damage. Vent pipe must
gas technicians, authorized gas Local codes may be more restric ve
be accessible for cleaning, inspec on,
company personnel, and authorized and may not allow single wall vent pipe.
and replacement.
service technicians. Failure to properly Single-wall vent pipe cannot be used for
vent the water heater can result in water heaters located in a cs and may
Termina ons
severe injury or death from carbon not pass through a c spaces, crawl
If local codes allow, this water heater
monoxide poisoning. spaces, or any confined or inaccessible
may be terminated into an exis ng
loca on. Single-wall vent pipe cannot
chimney using the instruc ons below.
The vent system must be installed pass through any interior wall.
Otherwise, this water heater’s vent
according to local and state codes, or
Clearance to Combus ble Materials must terminate ver cally (sidewall or
in the absence of local or state codes,
All parts of the vent system must main- other horizontal termina ons are not
the current edi on of the Na onal Fuel
tain the following clearances from any allowed).
Gas Code, ANSI Z223.1 (NFPA 54). Do
not common vent this water heater combus ble materials:
Chimney Termina on
with any power vented appliance. Do
• Single-wall vent pipe must main-
not use a vent damper anywhere in the
tain a six inch clearance from
vent system of this water heater.
combus ble materials. The single-
To reduce the risk of carbon monoxide wall vent pipe cannot pass through
poisoning, install a fuel gas and carbon any ceiling, floor, firewall, or fire
monoxide detector. Install and maintain par on.
the detector in accordance with the
• The clearance from combus ble
manufacturer’s instruc ons and local
materials of UL listed Type B dou-
codes.
ble-wall vent pipe is specified by
the manufacturer of the vent pipe. Figure 7 - Chimney termination vent system
Replacing a Water Heater Using UL listed Type B double-wall vent
NOTICE: Before connec ng a vent to
the Exis ng Vent System pipe may pass through walls or par-
a chimney, make sure the chimney
ons constructed of combus ble
Read the “Installing a New Vent Sys- passageway is clear and free of obstruc-
material if the minimum clearance
tem” sec on of this manual and make ons. The chimney must be cleaned if
specified by the manufacturer of
sure your vent system is properly in- previously used for ven ng solid fuel
the vent pipe is maintained.
stalled. Inspect the exis ng vent system appliances or fireplaces. Also consult lo-
for obstruc ons, corrosion, and proper Vent Installa on cal and state codes for proper chimney
installa on. Repair or replace if neces- To improve the flow of exhaust gases, sizing and applica on or, in the absence
sary. The exis ng vent system must be we recommend that a minimum of 12 of local and state codes, the “Na onal
UL listed Type B double wall or single inches of ver cal vent pipe be installed Fuel Gas Code”, ANSI Z223.1(NFPA
wall metal vent pipe of either 3 inch or on the dra hood prior to any elbow. 54)-current edi on.
4 inch diameter and installed according A por on of the vent pipe (up to 75%
• The vent pipe must be installed
to the vent manufacturer’s instruc ons of the total ver cal height) can be
above the extreme bo om of the
and the terms of its lis ng. Do not use horizontal, but the termina on must
chimney to prevent poten ally
other materials such as dryer vent hose. be ver cal. For the horizontal sec on,
blocking the flue gases.
Residen al Ultra Low NOx Gas Water Heater Use and Care Guide • 11GETTING STARTED
• The vent pipe must be firmly at- 1. Install a readily accessible manual
tached and sealed to prevent it shut-off valve in the gas supply line
from falling out. as recommended by the local u l-
ity. Know the loca on of this valve
• To aid in removing the vent pipe, a and how to turn off the gas to this
thimble or slip joint may be used. unit.
• The vent pipe must not extend 2. Install a Sediment Trap as shown
GETTING STARTED
beyond the inner edge of the in the Gas Piping figure below. The
chimney as it may restrict the Sediment Trap must be no less than
space between it and the opposite three inches long for the accumula-
Figure 8 - Vertical gas vent system with type B on of dirt, foreign material, and
wall of the chimney.
double wall vent pipe
water droplets.
Do not terminate the vent pipe in a
3. Install a ground joint union be-
chimney that has not been cer fied
tween the gas control valve and
for this purpose. Some local codes may
the manual gas shut-off valve. This
prohibit the termina on of vent con-
is to allow easy removal of the gas
nectors in a masonry chimney.
control valve.
Common (combined) ven ng is allow- 4. Turn the gas supply on and check
able with ver cal Type B vent systems for leaks. Use a small, so -bristled
and lined masonry chimneys as long brush to apply a hand dishwash-
as proper dra for the water heater ing soap and water mixture (1
Figure 9 - Venting through a chimney with type
is established under all condi ons of B double wall vent pipe part soap to 15 parts water) or
opera on. Do not common vent this children’s soap bubbles to all con-
Gas Piping
water heater with any power vented nec on points of the gas piping.
appliance. Gas piping must be installed accord-
Saturate all the connec ons and
ing to local and state codes or, in the
check for gas leaks (which will ap-
Ver cal Termina on absence of local and state codes,
pear as small bubbles). If any leaks
NOTICE: The gas vent must be termi- the “Na onal Fuel Gas Code”, ANSI
are detected, ghten the appropri-
nated in a ver cal posi on to facilitate Z223.1(NFPA 54)-current edi on.
ate connec on(s) and re-check.
the removal of exhaust gases.
NOTICE: When installing gas piping, Gas Pressure
Ver cal exhaust vents must terminate apply pipe joint compound or thread
with a listed cap or other roof assem- sealant tape approved for fuel gases. NOTICE: When tes ng gas pipes with
bly and be installed according to their a test pressure of more than ½ psi (3.5
manufacturer’s instruc ons. An unused kPa), disconnect the gas line at the
chimney flue or masonry enclosure manual shut off valve and cap the gas
may be used as a passageway for the line. Do not subject the water heater’s
installa on of vent pipe. Do not com- gas control valve or manual shut off
mon vent this water heater with any valve to more than ½ psi (3.5 kPa)
power vented appliance. The follow- pressure for any reason. If you are
ing figures are examples of vent pipe pressure tes ng the gas line with test
system installa ons and may or may pressure of ½ psi (3.5 kPa) or less, you
not be suitable for your specific appli- may isolate the water heater from the
ca on. Consult the “Na onal Fuel Gas gas line by closing the manual shut off
Figure 10 - Gas Piping
Code”, NFPA 54, ANSI Z223.1-current valve.
edi on and local codes.
12 • Residen al Ultra Low NOx Gas Water Heater Use and Care GuideGETTING STARTED
Space Hea ng con nuous flow of water through the
air handler circuit during the off cycle.
TYPICAL MIXING VALVE INSTALLATION
COMBINATION SPACE HEATING / POTABLE WATER HEATING SYSTEM • The domes c hot water line from the
water heater should be ver cal past
EXPANSION TANK COLD WATER INLET
any mixing valve or supply line to the
CHECK VALVE † SHUT-OFF
(1/8” HOLE VALVE air handler to remove air bubbles from
TEMPERED WATER CHECK VACUUM
DRILLED IN CLAPPER)
TO FIXTURES VALVE † RELIEF
VALVE
the system. Otherwise, these bubbles
GETTING STARTED
(MUST MEET TEMPS LISTED
IN MASS. CODE 248 CMR † ) will be trapped in the air handler heat
FLOW CONTROL exchanger coil, reducing efficiency.
VALVE
UNION UNION
PUMP * • Do not connect the water heater to
TEMP/
MUST BE VERTICAL TO PRESSURE OUT IN
any system or components previously
REMOVE AIR BUBBLES RELIEF
HOT
VALVE used with non-potable water heat-
WATER TO COIL
OUT AIR ing appliances when used to supply
MIXING VALVE
HANDLER
(MUST BE INSTALLED BELOW potable water.
TOP OF WATER HEATER SEE
AS PER MANUFACTURER’S NOTE ‡
RECOMMENDATIONS)
AIR
HANDLER Solar Installa on
SHUT-OFF
VALVE *
WATER HEATER ACCEPTED If this water heater is used as a solar stor-
BY THE BOARD FOR
INSTALLATION IN
100’-0” MAXIMUM DISTANCE
age heater or as a backup for the solar
MASSACHUSETTS. †
FROM WATER HEATER †
TO FAN COIL AND BACK system, the water supply temperatures
(DEVELOPED LENGTH) NOT
INCLUDING COIL IN HEATING UNIT. to the water heater tank may be in excess
* MASSACHUSETTS INSTALLATION REQUIREMENTS:
1.) CONNECT ELECTRONICALLY-CONTROLLED TIMER TO AN ALL-BRONZE PUMP. PUMP MUST ACTIVATE EVERY 6 HOURS
of 120°F. A Thermosta c Mixing Valve or
FOR 60 SECONDS. TURN PUMP TIMER OFF BEFORE CLOSING PIPING LOOP SHUT-OFF VALVE.
2.) ALL WATER PIPING MUST BE INSTALLED AND INSULATED IN ACCORDANCE WITH MASSACHUSETTS CODE (248 CMR
other temperature limi ng valve must be
& 780 CMR). installed in the water supply line to limit
3.) PIPING LOOP BETWEEN WATER HEATER AND AIR HANDLER MUST BE INSTALLED IN COMPLIANCE WITH 248 CMR.
† REQUIRED FOR MASSACHUSETTS.
the supply temperature to 120°F. The unit
‡ PIPING FROM THE TOP OF THE WATER HEATER WITH TEES IS ACCEPTABLE. must be set to Standard Mode (See Operat-
ing Modes in Opera on sec on on page
Figure 11 - Combustion Space Heating and Potable Water (Typical Installation)
24).
Some water heater models are equipped
• Do not use with piping that has been NOTICE: Solar water hea ng systems can
with inlet/outlet connec ons for use with
treated with chromates, boiler seal or o en supply water with temperatures
space hea ng applica ons. If this water
other chemicals and do not add any exceeding 180°F and may result in water
heater is to be used to supply both space
chemicals to the water heater piping. heater malfunc on.
hea ng and domes c potable (drinking)
water, the instruc ons listed below must • If the space hea ng system requires
be followed. water temperatures in excess of 120°F,
install a Thermosta c Mixing Valve
• This water heater is suitable for in the domes c (potable) hot water
combina on water (potable) hea ng supply at each point-of-use to limit the
and space hea ng and not suitable for risk of scald injury. Install the mixing
space hea ng applica ons only. valve per its manufacturer’s instruc-
• Be sure to follow the manual(s) ons.
shipped with the air handler system. • Pumps, valves, piping, and fi ngs
• This water heater is not to be used as must be compa ble with potable
a replacement for an exis ng boiler water.
installa on. • A properly installed flow control valve
is required to prevent thermosiphon-
ing. Thermosiphoning is the result of a
Residen al Ultra Low NOx Gas Water Heater Use and Care Guide • 13INSTALLATION
✓
an outside faucet and measure the Water pressure
Step 1: maximum water pressure experienced
throughout a 24-hour period (highest
increase caused
✓ Verify that your
home is equipped
water pressures o en occur at night). by thermal expansion
Verify that you have a properly sized
Thermal Expansion Tank. We recom-
and up-to-date for mend installing an expansion tank if
proper opera on your home does not have one. Plumb-
ing codes require a properly pressur-
Installing a new water heater is the
ized, properly sized Thermal Expan-
perfect me to examine your home’s
sion Tank in almost all homes.
plumbing system and make sure the
system is up to current code stan-
dards. There have likely been plumb- Figure 12 - Use a Water Pressure Gauge to make
ing code changes since the old water sure your home’s water pressure is not too
high.
heater was installed. We recommend
installing the following accessories To adjust your home’s water pressure:
and any other needed changes to Locate your home’s Pressure Reduc-
bring your home up to the latest code ing Valve (PRV) on the main incoming
requirements. Upda ng your plumb- (cold) water supply line and adjust the
INSTALLATION
ing system can help extend the life of water pressure control to between
your water heater, avoid damage to 50 and 60 psi. If your home does not
your home and property, and reduce have a Pressure Reducing Valve, install
the risk of serious injuries or death. a PRV on the home’s main water sup-
Inspect your home and install any de- ply line and set it to between 50 and
Figure 13 - A Thermal Expansion Tank helps
vices you need to comply with current 60 psi. Pressure Reducing Valves are protect the home’s plumbing system from pres-
codes and assure that your new water available at Lowe’s®. sure spikes.
heater performs at its best. Check BACKGROUND: Over the years, HOW: Connect the Thermal Expan-
with your local plumbing official for many u li es have increased water sion Tank (available at Lowe’s®) to the
more informa on. supply pressures so they can serve cold water supply line near the water
more homes. In some homes today, heater. The expansion tank contains
pressures can exceed 100 psi. High a bladder and an air charge. To work
✓ Water pressure
Most codes allow a maximum
water pressures can damage water
heaters, causing premature leaks. If
properly, the Thermal Expansion Tank
must be sized according to the water
you have replaced toilet valves, had heater’s tank capacity and pressurized
incoming water pressure of 80 psi
a water heater leak, or had to repair to match the home’s incoming water
(we recommend a working pressure
appliances connected to the plumb- pressure. Refer to the instruc ons
no higher than 50-60 psi). Check your
ing system, pay par cular a en on provided with the Thermal Expansion
home’s water pressure with a pressure
to your home’s water pressure. When Tank for installa on details.
gauge and adjust if necessary. High
purchasing a PRV, make sure the PRV
water pressure can damage the water
has a built-in bypass. BACKGROUND: Water expands when
heater, piping, and other appliances.
heated, and the increased volume
of water must have a place to go, or
HOW: Purchase an inexpensive water
thermal expansion will cause large
pressure gauge from Lowe’s®. Con-
increases in water pressure (despite
nect the water pressure gauge to
14 • Residen al Ultra Low NOx Gas Water Heater Use and Care GuideINSTALLATION
the use of a Pressure Reducing Valve and shutoff device (available at
in the home’s main water supply line). Lowe’s®). These devices can detect
The Safe Drinking Water Act of 1974 water leaks and can shut off the
requires the use of backflow preven- water heater’s water supply if a leak
ters and check valves to restrict water occurs.
from your home reentering the public • Install a metal drain pan (available
water system. Backflow preventers are at Lowe’s®) under the water heater
o en installed in water meters and to catch condensa on or leaks from
may not be readily visible. As a result, the piping connec ons or tank.
most all plumbing systems today are Most codes require, and we recom-
now “closed,” and almost all homes mend, installing the water heater in
Figure 15 - Thermostatic Mixing Valves installed
now need a Thermal Expansion Tank. a metal drain pan that is piped to an at each point-of-use can help avoid scalding
adequate drain. The drain pan must
BACKGROUND: A Thermosta c Mixing
A Thermal Expansion Tank is a prac - be at least two inches wider than
Valve, installed at each point-of-use,
cal and inexpensive way to help avoid the diameter of the water heater.
mixes hot water from the water heater
damage to the water heater, washing Install the drain pan so the water
with cold water to more precisely
machine, dishwasher, ice maker, and level would be limited to a maximum
regulate the temperature of hot water
even toilet valves. If your toilet oc- depth of 1-3/4”. The pan must not
supplied to fixtures. If you aren’t sure
casionally runs for no apparent reason restrict air flow to the burner.
if your plumbing system is equipped
INSTALLATION
(usually briefly at night), that may be
with properly installed and adjusted
due to thermal expansion increasing
the water pressure temporarily.
✓ Water Tempera-
ture Regula on
Thermosta c Mixing Valves at each
point where hot water is used, contact
a qualified person.
✓
Install Thermosta c Mixing Valves to
Water Pipe and
regulate the temperature of the water
Tank Leaks supplied to each point-of-use (for
example, kitchen sink, bathroom sink,
bath, shower). Install and adjust the
mixing valve according to its manufac-
turer’s instruc ons.
WARNING! Even if the water
heater’s thermostat is set to a rela-
vely low temperature, hot water can
scald. Install Thermosta c Mixing
Valves at each point-of-use to reduce
the risk of scalding.
Figure 14 - A metal drain pan piped to an ad-
equate drain can help protect flooring from leaks
and drips.
Leaks from plumbing pipes or from the
water heater itself can damage prop-
erty and could cause a fire risk.
• Install an automa c leak detec on
Residen al Ultra Low NOx Gas Water Heater Use and Care Guide • 15INSTALLATION
or oily vapors, at least annually • Avoid loca ons such as a cs, up-
Step 2: check and clean the air filter. See per floors, or where a leak might
Verify that the loca on Maintenance sec on for steps on damage the structure or furnish-
cleaning the air filter. ings. Due to the normal corrosive
is appropriate • Do not install in a bathroom, ac on of water, the tank will
WARNING! Do not store or use bedroom, or any occupied room eventually leak. To minimize prop-
flammable materials, vapors, or
normally kept closed. erty damage from leaks, inspect
liquids in the same loca on where this
• If the water heater is installed di- and maintain your water heater
water heater is installed.
rectly on carpe ng, it shall be in- in accordance with this manual’s
Before installing your water heater, stalled on a metal or wood panel instruc ons. Install a metal drain
ensure that it will be located: extending beyond the full width pan under the water heater piped
• Indoors in an area with adequate and depth of the water heater to an adequate drain. Inspect the
air supply. by at least 3 in (76.2mm) in any drain pan, pipes, and surrounding
• In an area that will not freeze. direc on. If the water heater is area regularly and fix any leaks
• As close as possible to a chimney installed in an alcove or closet, found.
or vent. the en re floor shall be covered
• In a metal drain pan piped to an by the aforestated panel. Step 3:
adequate drain. • If your area is prone to earth-
• In an area suitable for ver cal quakes, use special straps as
Removing the old
INSTALLATION
installa on. required by local building codes.
• In an area with adequate space NOTICE: The state of California re- water heater
(clearances) for periodic servicing quires bracing, anchoring, or strap-
(there must be a minimum of 24 Read each installa on step and
inches of front clearance).
ping the water heater to avoid its 1 decide if you have the neces-
moving during an earthquake. Contact
• In an area that allows a minimum sary skills to install the water
local u li es for code requirements in
clearance from combus ble sur- heater. Only proceed if you are comfort-
your area, visit h p://www.dsa.dgs.
faces as stated on the data plate. able you can safely perform the work. If
ca.gov, or call 1-916-445-8100 and
• On a floor that can support the you are not sure, have a qualified person
request instruc ons. Other loca ons
weight of a water heater full of perform the installa on.
may have similar requirements. Check
water. with your local and state authori es.
You will also want to follow these
• Do not install in a loca on prone
guidelines while considering an appro-
to physical damage by vehicles,
priate loca on:
flooding, or other risks.
• Do not install near air-moving
devices such as exhaust fans,
ven la on systems, or clothes
dryers.
Vehicle
• Do not obtain ven la ng air for Stop
the furnace/air handler from the
same space as the water heater. Drain Drain
Pan
Ensure that any return air ducts
Figure 16 - In a garage, install a vehicle stop to
near the water heater are sealed.
avoid water heater damage.
• If the water heater is located
in an area subject to lint, dust,
16 • Residen al Ultra Low NOx Gas Water Heater Use and Care GuideINSTALLATION
On the old water heater, turn drain, outside, or in buckets. (Sedi-
2 the control knob on the gas ment in the bo om of the tank may
control valve to the clog the valve and prevent it from
OFF posi on. draining. If you can’t get the tank to
drain, contact a qualified person.)
Turn the cold water supply
6 valve OFF.
Figure 21 - Removing the T&P Relief Valve
discharge pipe.
Allow the vent pipe and dra
10 hood to cool. Once cooled,
Gas
control disconnect the vent pipe from
knob the dra hood. You may need to
support the vent pipe un l the new
Figure 19 - Cold water supply in off position. water heater is in place.
Figure 17 - Turn gas control/temperature knob OFF.
Turn the manual gas valve for Using a standard flat-blade
INSTALLATION
3 the water heater’s supply line
7 screwdriver, open the drain
OFF. valve. Sediment build up in
Open a hot water faucet and the bo om of the water heater may
4 let the hot water run un l it is hinder or prevent draining.
cool (This may take 10 min
utes or longer).
Figure 22 - Disconnect the vent pipe from the
draft hood.
Disconnect the water pipes.
11 Many water pipes are con-
Figure 20 - Draining the old water heater. nected by a threaded union
Also open a hot water faucet which can be disconnected with
8 to help the water in the tank wrenches. If you must cut the water
Figure 18 - Let the hot water run until it is cool. drain faster. pipes, cut the pipes close to the water
WARNING! Be sure the water runs When the tank is empty, heater’s inlet and outlet connec ons,
cool before draining the tank to reduce 9 disconnect the Temperature & leaving the water pipes as long as
the risk of scalding. Pressure (T&P) Relief Valve possible. If necessary, you can make
discharge pipe. You may be able to them shorter later when you install the
Connect a garden hose to the reuse the discharge pipe, but do not new water heater.
5 drain valve and place the reuse the old T&P Relief Valve. A new Confirm the manual gas valve
other end of the hose in a T&P Relief Valve comes with your new 12 for the water heater’s supply
water heater.
Residen al Ultra Low NOx Gas Water Heater Use and Care Guide • 17INSTALLATION
line is turned off. Disconnect the gas Set the water heater in place
line from the water heater’s gas 3 taking care not to damage the
control valve and cap it. drain pan. When installing
Remove the old water heater. directly on carpet, the water heater
13 Use an appliance dolly or must be installed on a wood or metal
hand truck to move the water base that extends beyond the dimen-
heater. sions of the water heater (width and
depth) by at least 3 inches (76.2 mm)
WARNING! Use two or more
in any direc on. If the water heater is
people to remove or install a water
installed on carpet in an alcove or
heater. Failure to do so can result in
closet, the en re floor must be covered
back or other injury.
by a wood or metal panel. Figure 24 - Filter attached to water heater.
NOTICE: Most codes require se ng
Step 4: the water heater in a metal drain pan
Installing the New piped to an adequate drain. The drain
pan helps avoid property damage
Water Heater which may occur from condensa on
Completely read all instruc- or leaks in the piping connec ons or
1 ons before beginning. If you tank. The drain pan must be at least
INSTALLATION
are not sure you can safely two inches wider than the diameter
complete the installa on, seek assis- of the water heater. Install the drain
tance from any of the following sources: pan so the water level is limited to a
• Lowe’s® Professional Installa on maximum depth of 1-3/4”.
is available for this product and Verify that the water heater is
the work is guaranteed. Call your 4 set in place properly. Check
Lowe’s® store to have this water that:
heater installed. • There is adequate space to install
• Schedule an appointment with the T&P Relief Valve discharge
a qualified person to install your pipe and that it can be piped to a
water heater. separate drain (and not into the
• Call our Technical Assistance Hotline drain pan).
at 1-877-817-6750. • There is adequate access and
space around the water heater
Install a metal drain pan that
2 is piped to an adequate drain.
for future maintenance.
The water heater is installed ver cally.
Step 5:
Air Filter Installa on
This water heater is equipped with a
base-ring air filter. Before proceeding
to the next step, visually check the
filter to ensure it is properly seated
in the base-ring. Do not operate the
Figure 23 - Metal drain pan piped to drain. water heater without the a clean air
filter in place.
18 • Residen al Ultra Low NOx Gas Water Heater Use and Care GuideINSTALLATION
Step 6: Step 7:
Connect the Tempera- Install Shutoff and Ther-
ture and Pressure (T&P) mosta c Mixing Valves
Relief Valve/Pipe If one is not already installed,
1 install a manual shutoff valve
Most T&P Relief Valves are pre-
in the cold water line that
installed at the factory. In some cases,
supplies the water heater. Install the
they are shipped in the carton and
shutoff valve near the water heater so
must be installed in the opening
Figure 26 - Temperature and Pressure Relief that it is readily accessible. Only use a
marked “T&P Relief Valve” and accord- Valve Pipe
full-flow ball or gate valve compa ble
ing to local codes. • The discharge pipe must not be with potable water.
smaller than the pipe size of the Install a Thermosta c Mixing
T&P Relief Valve. The pipe must 2 Valve at each point-of-use (for
also be able to withstand 250°F example, kitchen sink,
(121°C) without distor on. Use bathroom sink, bath, shower) per the
only copper or CPVC pipe. Do not valve manufacturer’s instruc ons.
use any other type of pipe, such as
INSTALLATION
PVC, iron, flexible plas c pipe, or
any type of hose.
• Terminate the discharge pipe a
maximum of six inches above a
Figure 25 - Temperature and Pressure Relief Valve floor drain or outside the building.
Do not drain the discharge pipe
WARNING! To avoid serious injury
into the drain pan; instead pipe it
or death from explosion, install a T&P
Relief Valve according to the following separately to an adequate drain.
instruc ons: In cold climates, terminate the dis-
If the T&P Relief Valve was not charge pipe inside the building to Figure 27 - Install Thermostatic Mixing Valves at
1 factory installed, install the an adequate drain. Outside drains each point where hot water will be used.
could freeze and obstruct the WARNING! Even if the water
new T&P Relief Valve that
heater’s thermostat is set to a rela-
came with your water heater. Do not drain line—protect the discharge
vely low temperature, hot water can
reuse an old T&P Relief Valve. pipe from freezing.
scald. Install Thermosta c Mixing
• The discharge pipe should be at • Do not place any valve or other
Valves at each point-of-use to reduce
least 3/4” inside diameter and restric on between the tank and the risk of scalding.
sloped for proper drainage. Install T&P Relief Valve. Do not cap,
it to allow complete drainage of block, plug, or insert any valve
both the T&P Relief Valve and the between the T&P Relief Valve and
discharge pipe. the end of the discharge pipe. Do
not insert or install any reducer in
the discharge pipe.
Residen al Ultra Low NOx Gas Water Heater Use and Care Guide • 19INSTALLATION
For water heaters that are fed IF YOU HAVE COPPER PIPES: connec ons contain non-metallic parts
3 by a solar water hea ng
which could be damaged. The proper
If your home has copper water pipes, way to connect the water heater to
system (or any other pre- you can solder the water pipe connec- copper water pipes is as follows:
hea ng system), always install a ons or use compression fi ngs which
Thermosta c Mixing Valve or other don’t require soldering. Compression
temperature limi ng device in the fi ngs are easier to install than solder-
inlet water supply line to limit water ing pipe. Check with local plumbing
supply inlet temperature to 120°F. officials to determine what types of
Solar water hea ng systems can pipe materials are suitable for your
supply water with temperatures loca on. Do not use lead-based solder.
exceeding 180°F and may result in
water heater malfunc on.
• Solder a short length of pipe (about a
WARNING! Hot water provided by
solar hea ng systems can cause foot or so) to a threaded adapter us-
severe burns instantly, resul ng in ing only 95/5 n-an mony or equiva-
severe injury or death. lent solder. A ach the threaded
adapters to the water heater’s con-
nec ons (using thread sealant tape
INSTALLATION
Compression fi ngs don’t require soldering.
or pipe joint compound). Connect
NOTICE: Do not solder pipes while the home’s water pipes by soldering,
they are a ached to the water heater. keeping the connec ons at the water
The water heater’s inlet and outlet heater cool with wet rags.
Step 8: Connect the cold water
2
supply using 3/4 inch
Connect the Water Na onal Pipe Thread “NPT” to the
Supply fi ng marked “C” (COLD).
Note that all piping and components
For ease of removing the water heater
connected to the water heater must
for service or replacement, con-
be suitable for use with potable water.
nect the water pipes with a coupling
called a union. We recommend using
Determine the type of water
1 pipes in your home. Most
a dielectric-type union (available at
Lowe’s®). Dielectric unions can help
homes use copper water
prevent corrosion caused by ny elec-
pipes, but some use CPVC or cross-
tric currents common in copper water
linked polyethylene (PEX). Use fi ngs
pipes and can help extend the life of
appropriate for the type of pipe in
the water heater
your home. Do not use iron or PVC
pipe.
20 • Residen al Ultra Low NOx Gas Water Heater Use and Care GuideYou can also read
