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Residen al Standard Gas Water Heater Use and Care Guide • 11
GETTING STARTED
Residen al Standard Gas Water Heater Use and Care Guide • 11
GETTING STARTED
Ven ng
WARNING! Carbon Monoxide
Hazard. This water heater must be
supplied with adequate air and vented
to outdoors. The vent system must be
installed by a qualifi ed person.
Examples of a qualifi ed person include
gas technicians, authorized gas
company personnel, and authorized
service technicians. Failure to properly
vent the water heater can result in
severe injury or death from carbon
monoxide poisoning.
The vent system must be installed
according to local and state codes, or
in the absence of local or state codes,
the current edi on of the Na onal Fuel
Gas Code, ANSI Z223.1 (NFPA 54). Do
not common vent this water heater
with any power vented appliance. Do
not use a vent damper anywhere in the
vent system of this water heater.
To reduce the risk of carbon monoxide
poisoning, install a fuel gas and carbon
monoxide detector. Install and maintain
the detector in accordance with the
manufacturer’s instruc ons and local
codes.
Replacing a Water Heater Using
the Exis ng Vent System
Read the “Installing a New Vent Sys-
tem” sec on of this manual and make
sure your vent system is properly in-
stalled. Inspect the exis ng vent system
for obstruc ons, corrosion, and proper
installa on. Repair or replace if neces-
sary. The exis ng vent system must be
UL listed Type B double wall or single
wall metal vent pipe of either 3 inch or
4 inch diameter and installed according
to the vent manufacturer’s instruc ons
and the terms of its lis ng. Do not use
other materials such as dryer vent hose.
Installing a New Vent System
The vent pipe must meet the following
specifi ca ons:
Type of Material
UL listed Type B double wall or single
wall metal vent pipe must be used.
Local codes may be more restric ve
and may not allow single wall vent pipe.
Single-wall vent pipe cannot be used for
water heaters located in a cs and may
not pass through a c spaces, crawl
spaces, or any confi ned or inaccessible
loca on. Single-wall vent pipe cannot
pass through any interior wall.
Clearance to Combus ble Materials
The vent pipe cannot pass through any
ceiling, fl oor, fi rewall, or fi re par on.
Any part of the vent system must main-
tain the following clearances from any
combus ble materials:
• Single-wall vent pipe must main-
tain a six inch clearance from
combus ble materials.
• The clearance from combus ble
materials of UL listed Type B dou-
ble-wall vent pipe is specifi ed by
the manufacturer of the vent pipe.
UL listed Type B double-wall vent
pipe may pass through walls or par-
ons constructed of combus ble
material if the minimum clearance
specifi ed by the manufacturer of
the vent pipe is maintained.
Vent Installa on
To improve the fl ow of exhaust gases,
we recommend that a minimum of 12
inches of ver cal vent pipe be installed
on the dra hood prior to any elbow.
A por on of the vent pipe (up to 75%
of the total ver cal height) can be
horizontal, but the termina on must
be ver cal. For the horizontal sec on,
install without dips or sags with an
upward slope of at least ¼ inch per
foot. Install pipe avoiding unnecessary
bends. Pipe joints must be fastened by
sheet metal screws or other approved
means. Support the pipe to maintain
clearances and to avoid separa on of
joints or other damage. Vent pipe must
be accessible for cleaning, inspec on,
and replacement.
Termina ons
If local codes allow, this water heater
may be terminated into an exis ng
chimney using the instruc
ons below.
Otherwise, this water heater’s vent
must terminate ver cally (sidewall or
other horizontal termina ons are not
allowed).
Chimney Termina on
Figure 7 - Chimney termination vent system
NOTICE: Before connec ng a vent to
a chimney, make sure the chimney
passageway is clear and free of obstruc-
ons. The chimney must be cleaned if
previously used for ven ng solid fuel
appliances or fi replaces. Also consult lo-
cal and state codes for proper chimney
sizing and applica on or, in the absence
of local and state codes, the “Na onal
Fuel Gas Code”, ANSI Z223.1(NFPA
54)-current edi on.
• The vent pipe must be installed
above the extreme bo om of the
chimney to prevent poten ally
blocking the fl ue gases.
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