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Install shutoff and
tempering valves
1
If one is not already installed,
install a manual shutoff valve
in the cold water line that
supplies the water heater. Install the
shutoff valve near the water heater so
that it is readily accessible. Only use
valves that are compa ble with
potable water. Use only full-fl ow ball
or gate valves. Other types of valves
may cause excessive restric on to the
water fl ow.
2
Install a Thermosta c Mixing
Valve at each point-of-use
(for example, kitchen sink,
bathroom sink, bath, shower).
Consult the valve manufacturer’s
instruc ons or a qualifi ed person.
Figure 14 - Install Thermostatic Mixing Valves at
each point where hot water will be used.
WARNING! Even if the water
heater’s thermostat(s) are 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. (See page 4.)
3
For water heaters that are fed
by a solar water hea ng
system (or any other pre-heat-
ing system), always install a Thermo-
sta c Mixing Valve or other tempera-
ture 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 170°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 (see page 4).
1
Connect the water
supply
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 – they are not suitable for potable
water.
2
Connect the cold water
supply using 3/4 inch
Na onal Pipe Thread “NPT”
to the fi ng marked “C” (COLD).
For ease of removing the water heater
for service or replacement, con-
nect the water pipes with a coupling
called a union. We recommend using
a dielectric-type union (available at
your local plumbing supplier). Dielec-
tric unions can help prevent corro-
sion caused by ny electric currents
common in copper water pipes and
can help extend the life of the water
heater. See step 10 for installing the
leak detec on system, for further
installa on instruc ons.
NOTICE: Some models come with a
cold water shut-off valve. This is to
be installed in the cold water line
near the water heater. Make sure the
module cable can be easily plugged
into the control assembly (within 30”).
See included kit instruc ons found
with the automa c cold water shut-off
valve, for further installa on instruc-
ons.
12 • Residen al Electronic Thermostat Electric Water Heater Use and Care Guide
INSTALLATION
Step 6:
Step 7:
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 of-
fi 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 us-
ing only 95/5 n-an mony or equiva-
lent solder. A ach the threaded
adapters to the water heater’s con-
nec ons (using thread sealant 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.
INSTALLATION
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