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LP-505 REV. 4.29.14
To control thermal expansion, a thermal expansion tank should be installed in systems with an installed backflow preventer. DO NOT
use a closed type expansion tank. Follow expansion tank manufacturer’s specifications 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
Use at least the MINIMUM pipe size for all water heater loop piping This is to avoid the possibility of inadequate flow 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” domestic water inlet and outlet. Tankless isolation valves between the city
water supply and tank inlet are recommended for ease of service.
D. PIPING DIAGRAM
Figure 17 – DHW Piping
Figure 18 – Piping with Recirculation
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