[quote author=]We aren't using the Hurricane. It's off. However, our engine circulates and heats the motorhome apparently if this water valve is not turned to restrict water to the hot water heater. If I have this wrong, would love more input. [/quote]
I believe the way it works is that there is a heat exchanger on the engine coolant loop but for the hurricant to actaully heat the air handlers the circulation pump must run which it does not unless it's either "on" or the dash switch is in the "preheat" position.
Baring that, there shouldn't be any appreciable heat inside the coach.