Installation Guide

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-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 tem-
perature 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, connect
the water pipes with a coupling called
a union. We recommend using a
dielectric-type union (available at lo-
cal plumbing supplies stores). 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.
12 • Residen al 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 compres-
sion fi  ngs which don’t require
soldering. Compression fi  ngs
are easier to install than soldering
pipe. Check with local plumbing
offi 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 con-
nect the water heater to copper
water pipes is as follows:
• Solder a short length of pipe
(about a foot or so) to a thread-
ed adapter using only 95/5  n-
an mony or equivalent solder.
A ach the threaded adapters to
the water heater’s connec ons
(using thread sealant tape or
pipe joint compound). Connect
the home’s water pipes by sol-
dering, keeping the connec ons
at the water heater cool with
wet rags.
INSTALLATION