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Will the back up heater and booster heater work simultaneously?

April 26, 2017booster heater simultaneously

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Will the back up heater and booster heater work simultaneously?

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The back up heater will never be operational in heat pump hot water mode. Both heaters can be operational if the back up heater is running and the booster heater ON temperature is reached, or if the outdoor unit breaks down and the back up heater has to cover the entire space heating load.The simultaneous operation of the back up heater and booster can be prevented by a field setting.