20 • Residen al Standard Gas Water Heater Use and Care Guide
INS
TALLA
TION
20 • Residen al Standard Gas Water Heater Use and Care Guide
INSTALLATION
Step 7:
Install Shuto
ff
and Ther-
mosta c Mixing Valves
1
If one is not already installed,
install a manual shuto
ff
valve
in the cold water line that
supplies the water heater. Install the
shuto
ff
valve near the water heater so
that it is readily accessible. Only use a
full-
fl
ow ball or gate valve compa ble
with potable water.
2
Install a Thermosta c Mixing
Valve at each point-of-use
(for example, kitchen sink,
bathroom sink, bath, shower) per the
valve manufacturer’s instruc ons.
Figure 27 -
Install Thermostatic Mixing Valves at
each point where hot water will be used.
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.
3
For water heaters that are fed
by a solar water hea ng
system (or any other pre-
hea ng system), always install a
Thermosta c Mixing Valve or other
temperature limi ng device in the
inlet water supply line to limit water
supply inlet temperature to 120°F.
Solar water hea ng systems can
supply water with temperatures
exceeding 180°F and may result in
water heater malfunc on.
WARNING! Hot water provided by
solar hea ng systems can cause
severe burns instantly, resul ng in
severe injury or death.
Step 8:
Connect the Water
Supply
Note that all piping and components
connected to the water heater must
be suitable for use with potable water.
1
Determine the type of water
pipes in your home. Most
homes use copper water
pipes, but some use CPVC or cross-
linked polyethylene (PEX). Use
fi
ngs
appropriate for the type of pipe in
your home. Do not use iron or PVC
pipe.
IF YOU HAVE COPPER PIPES:
If your home has copper water pipes,
you can solder the water pipe connec-
ons or use compression
fi
ngs which
don’t require soldering. Compression
fi
ngs are easier to install than solder-
ing pipe. Check with local plumbing
o
ffi
cials to determine what types of
pipe materials are suitable for your
loca on. Do not use lead-based solder.
NOTICE:
Do not solder pipes while
they are a ached to the water heater.
The water heater’s inlet and outlet
connec ons contain non-metallic parts
which could be damaged. The proper
way to connect the water heater to
copper water pipes is as follows:
• Solder a short length of pipe (about
a foot or so) to a threaded adapter
using only 95/5 n-an mony or
equivalent solder. A ach the thread-
ed adapters to the water heater’s
connec ons (using Te
fl
on® tape or
pipe joint compound). Connect the
home’s water pipes by soldering,
keeping the connec ons at the water
heater cool with wet rags.
Compression
fi
ngs don’t require soldering.
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