Rinnai RH180, Installation Fundamentals

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Water Requirements (continued)
- Make sure the water heater and its water lines are protected from freezing. Damage due
to freezing is not covered by the warranty.
- Do not use this appliance in an application such as a pool or spa heater that uses
chemically treated water. (the RH180 is suitable for filling large or whirlpool spa tubs using
potable water).
- If a water heater is installed in a closed water supply system, such as one having a
backflow preventer, a means shall be provided to control thermal expansion (expansion
tank).
- If required, install a vacuum relief valve per local codes. (Massachusetts 248 CMR section
10.14 (I) “All potable water pressure tanks shall be provided with a vacuum relief valve at
the top of the tank that will operate up t a maximum water pressure of 200 P.S.I.G. and to
a maximum water temperature of 200
°
F.”)
Electrical and Water Installation