Whirlpool 188413 User Manual

Piping, fittings, and valves should be installed according 
to the installation drawing (Figure 2). If the indoor 
installation area is subject to freezing temperatures, the 
water piping must be protected by insulation.

Water supply pressure should not exceed 80% of the 
working pressure of the water heater. The working 
pressure is stated on the water heater’s data plate. If 
this occurs a pressure limiting valve with a bypass may 
need to be installed in the cold water supply 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 fittings 
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 fittings.

Important: Always use a good grade of joint compound 
and be certain that all fittings are drawn up tight.

1.

Install the water piping and fittings as shown in 
Figure 2. Connect the cold water supply (3/4 NPT) 
to the fitting  marked “C”. Connect the hot water 
supply (3/4 NPT)  to the fitting marked “H”.

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 unions in both the hot and cold 
water supply lines is recommended for ease of 
removing the water heater for service or 
replacement.

3.

The manufacturer of this water heater recommends 
installing a tempering valve in the domestic hot 
water line as shown in Figures 3 and 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 temperature and pressure relief valve and 
discharge line 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 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.