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14 • Residenal Electric Water Heater Use and Care Guide
IF YOU HAVE COPPER PIPES:
If your home has copper water
pipes, you can solder the water pipe
connecons or use compression
ngs which do not require
soldering. Compression ngs
are easier to install than soldering
pipe. Check with local plumbing
ocials to determine what types of
pipe materials are suitable for your
locaon. Do not use lead-based
solder.
NOTICE: Do not solder pipes while
they are aached to the water
heater. The water heater’s inlet
and outlet connecons 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-anmony
or equivalent solder. Aach the
threaded adapters to the water
heater’s connecons (using
thread sealant tape or pipe joint
compound). Connect the home’s
water pipes by soldering, keeping
the connecons at the water heater
cool with wet rags.
NOTICE: Do not over apply joint
compound.
5
Install insulaon (or heat
tape) on the water pipes
especially if the indoor
installaon area is subject to freezing
temperatures. Insulang the hot
water pipes can increase energy
eciency.
6
Double check to make sure
the hot and cold water pipes
are connected to the correct
hot and cold water ngs on the
water heater. Ensure unused hot and
cold connecons are plugged and
capped.
7
If needed, install (or adjust)
the home’s Pressure
Reducing Valve to 50-60 psi
and install a Thermal Expansion Tank.
Figure 17 - A Pressure Reducing Valve is
required if your home’s water pressure is above
80 psi.
Figure 18 - The Thermal Expansion Tank should
be pressurized with air to match the home’s
incoming water pressure.
Recirculang Loop
A recirculaon loop is somemes
provided in a hot water system where
it is desirable to have on demand hot
water at the xtures.
A smaller diameter size pipe with an
inline circulaon pump is plumbed
to a locaon near the furthest
xture and to a locaon near the
water heater. The pump can run
connuously or intermiently
circulang enough tempered water
to keep heat loss in the plumbing
system, during low or no demand,
within an acceptable limit.
A recirculaon loop in your home
provides on demand hot water
to your xtures quickly and helps
migate the amount of wastewater
sent down the drain while you wait,
but hot water may be connuously
owing through your plumbing
system. If your recirculaon pipes
are not insulated well enough to
prevent heat energy loss, then your
pipes will radiate heat throughout
the surrounding areas of your home.
The heat energy lost can cause your
heat pump water heater to work
connuously to maintain the heat in
the pipes.
This heat pump water heater is
programmed with proprietary
soware to ensure the water heater
operates at peak eciency. Demand
for hot water in the plumbing
system will draw hot water from the
tank causing a heang cycle as the
supply water temperature is much
cooler than the water in the tank.
You should consider alternaves to
installing a heat pump water heater
in conjuncon with a residenal
recirculaon loop to prevent
the water heater from running
connuously due to the lower input
INSTALLATION
INSTALLATION
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