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I only know about the heat pump in a 2008. It will not heat the water tanks. When it is running, it is supposed to switch over automatically to furnace around 28˚. Below 40˚ it isn't all that efficient and never quite gets the cabin up to the temp set. It has to cycle through a phase to defrost the coils, then cycle into the next phase to send warm air to the cabin. The result is the colder it gets, the more it runs and the weirder the noises. But propane is expensive and I run it in the evening and when we go to bed, but if I wake up in the middle of the night and it's in the mid-30's outside, I turn on the furnace.
I don't know if this is any help unless you have a new A/C and the digital thermostat with the auto switch over in your Excella.
Gene
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