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Water supply pressure should be around 50 to 60 psi
and should not exceed 80 psi. If this occurs, a pressure
reducing valve should be installed in the cold water inlet
line. This should be placed on the supply to the entire
house in order to maintain equal hot and cold water
pressures.
IMPORTANT: Heat cannot be applied to the water fi ttings
on the heater as they may contain nonmetallic parts.
If solder connections are used, solder the pipe to the
adapter before attaching the adapter to the hot and cold
water fi ttings.
IMPORTANT: Always use a good grade of joint com-
pound and be certain that all fi ttings are drawn up tight.
1. Install the water piping and fitting as shown in
Figure 3. Connect the cold water supply (3/4” NPT)
to the fitting marked “Cold”. Connect the hot water
supply (3/4” NPT) to the fitting marked “Hot”.
IMPORTANT: Some models may contain energy saving
heat traps to prevent the circulation of hot water within
the pipes. Do not remove these inserts.
2. The Installation of dielectric unions in both the hot
and cold water supply lines is recommended for
ease of removing the water heater for service or
replacement.
3. Some local codes may require, and the manufac-
turer of this water heater recommends,
installing a mixing valve in the domestic hot water
line as shown in Figure 4. These valves reduce the
point-of-use temperature of the hot water by mixing
cold and hot water and are readily available.
Contact a licensed plumber or the local plumbing
authority.
4. If installing the water heater in a closed water
system, install a relief valve or expansion tank in
the cold water line as specified under “Closed
System/Thermal Expansion”.
5. Install a shut-off valve in the cold water inlet line. It
should be located close to the water heater and be
easily accessible. Know the location of this valve
and how to shut off the water to the heater.
6. Install a discharge line from the temperature and
pressure relief valve in the opening marked “T & P
RELIEF VALVE”. Install as specified under
“Temperature and Pressure Relief Valve”.
7. After piping has been properly connected to the
water heater, open the nearest hot water faucet.
Then open the cold water shut off valve and
allow the tank to completely fill with water. To purge
the lines of any excess air and sediment, keep the
hot water faucet open for 3 minutes after a constant
flow of water is obtained. Close the faucet and
check all connections for leaks.
In a Closed System use a
Thermal Expansion Tank.
Pressure Reducing
Valve With Bypass
Main
Water
Supply
Cold Water
Supply to
Fixtures
Cold Water
Inlet Valve
Hot Water
Outlet
Union
Temperature and
Pressure Relief Valve
Discharge line 6” maximum
above drain
Drain line
3/4” ID
minimum
Drain
Metal Drain Pan
2-1/2” depth max.
1”
Min.
Massachusetts:
Install vacuum relief
in cold water line per
section 19 MGL 142.
Figure 3
Water Piping Installation
GRID
ENABLED
VACATION
STANDARD
ENERGY
SMART
°F/°C
F
Figure 4
Mixing Valve
Top Water Connections
Unmixed
Hot Water
Mixed Water
To Fixtures
Cold Water
Inlet
Hot
Water
Outlet
Mixing Valve
(Set To 120 F)
0
Follow The Mixing Valve
Manufacturer’s Instructions
Water System Piping
Piping Installation
Piping, fi ttings, and valves should be installed according
to the installation drawing (Figure 3). If the indoor in-
stallation area is subject to freezing temperatures, the
water piping must be protected by insulation.