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Some details to consider when piping a heat pump water heater: Temp set-point, I set the tank temp higher and mix to a safe, desirable temp using a high quality thermostatic mixing valve. Shown: @caleffi_na 520 Angle Mix Thermal expansion protection is code and (h2o htr) manufacturer required if there is a check valve anywhere on the cold inlet piping for the tank. For MN if there’s no check on the main then the expansion tank isn’t needed, this house has a dual check on the main at the meter. T