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8 • Residenal Electric Water Heater Use and Care Guide
increases in water pressure (despite
the use of a Pressure Reducing
Valve on the home’s main water
supply line). The Safe Drinking Act
of 1974 requires the use of backow
preventers and check valves to restrict
water from your home reentering
the public water system. Backow
preventers are oen installed in
water meters and may not be readily
visible. As a result, most all plumbing
systems today are now “closed,” and
almost all homes now need a Thermal
Expansion Tank.
A Thermal Expansion Tank is a
praccal and inexpensive way to help
avoid damage to the water heater,
washing machine, dishwasher, ice
maker and even toilet valves. If
your toilet occasionally runs for no
apparent reason (usually briey at
night), that may be due to thermal
expansion increasing the water
pressure temporarily.
✓
Water Pipe and
Tank Leaks
Leaks from plumbing pipes or from
the water heater itself can damage
property and could cause a re risk.
• Install the provided leak detecon
sensor (see “Step 15” on page 18).
An automac cold water shut-o
valve is also available for purchase
(kit p/n 100345338). If an automac
cold water shut-o valve has been
purchased, see “Step 9” on page 13
for installaon instrucons. These
devices can detect water leaks and
can shut o the water heater’s
water supply if a leak occurs.
Figure 7 - A suitable drain pan piped to an
adequate drain can help protect flooring from
leaks and drips.
• Install a suitable drain pan (available
at your local plumbing supplier)
under the water heater (Figure 7) to
catch condensaon or leaks in the
piping connecons or tank. Most
codes require, and we recommend,
installing the water heater in a drain
pan that is piped to an adequate
drain. The drain pan must be at least
2” (50 mm) wider than the diameter
of the water heater. Install the
drain pan so the water level would
be limited to a maximum depth of
1-3/4” (45 mm).
✓
Water Tempera-
ture Regulaon
Figure 8 - Thermostatic Mixing Valves installed
at each point-of-use can help prevent scalds.
Install Thermostac Mixing Valves
(Figure 8) to regulate the temperature
of the water supplied to each point-
of-use (for example, the kitchen sink,
bathroom sink, bath and shower).
Consult the valve manufacturer’s
instrucons or a qualied person.
WARNING! Even if the water
heater thermostat is set to a
relavely low temperature, hot water
can scald. Install Thermostac Mixing
Valves at each point-of-use to reduce
the risk of scalding (see page 4 and
Figure 8).
BACKGROUND: A Thermostac Mixing
Valve, installed at each point-of-use,
mixes hot water from the water
heater with cold water to more
precisely regulate the temperature of
hot water supplied to xtures. If you
are not sure if your plumbing system
is equipped with properly installed
and adjusted Thermostac Mixing
Valves, at each point of use where
hot water is used, contact a qualied
person for more informaon.
Step 2:
Verify that the Locaon
is Appropriate
Before installing your water heater,
ensure that:
1
The water heater will be:
• Installed indoors close to the center
of the plumbing system.
• In a suitable drain pan piped to an
adequate oor drain or external to
the building (Figure 7).
• In an area that will not freeze.
• In an area that is suitable for
installing the water heater vercally
and on a level surface.
• Installed where a typical home
appliance sound would not cause a
disturbance.
• Not used for space heang.
NOTICE: Water heater must be level!
INSTALLATION
INSTALLATION
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