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Use a WaterHeater:HeatPump:WrappedCondenser object that references a WaterHeater:Stratified storage tank with natural gas fuel type.

By default, the heat pump will strive to meet the hot water load and the natural gas will serve as backup. If you want to disable the heat pump at various times, you can write an EMS program to, for example, actuate the Schedule Value of the heat pump compressor availability schedule.