HPWH impact on load calcs
If one installs a heat pump water heater (HPWH) in the conditioned space, how does that impact the calculation of the design heat load and design cooling load?
For example, if the specs say that it uses 500 watts in heat pump mode and has a COP of 2.5, should the heat load include the (2.5-1)*500 = 750 watts that comes out of the house air? Or, is it not necessary to include the whole amount because the HPWH runs intermittently?
I am guessing that you can’t take a credit for it in the cooling load since it won’t necessarily be running.
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