Instructions / Assembly
AP18733 REV. 3.2.17
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CAUTION
Use at least the MINIMUM pipe size for all water heater loop piping This is to avoid the possibility of inadequate ow through the water heater.
Using less than the required minimum pipe size and piping could result in system problems, property damage, and premature water heater
failure. Such problems ARE NOT covered by product warranty.
Use both thread tape and pipe dope to connect to the ¾" (1.9 cm) domestic water inlet and outlet. Tankless isolation valves between the city
water supply and tank inlet are recommended for ease of service.
▪ D. APPLICATIONS
▪ B. INSTALL A BACKFLOW PREVENTER
It may be recommended to use a back ow preventer – check local codes. If a back ow preventer or a no return valve is used, a thermal
expansion tank must be installed on the cold water supply between the water heater and valve.
WARNING
To control thermal expansion, a thermal expansion tank should be installed in systems with an installed backow preventer. DO NOT use
a closed type expansion tank. Follow expansion tank manufacturer’s specications to properly size an expansion tank to the installation.
Failure to properly accommodate thermal expansion could result in property damage, severe personal injury, or death.
▪ C. PIPING THE WATER HEATER