[robfogle]

Depending on the model and year I imagine that they are different. On My 2007 Endura 6340 the water and holding tank area is fully enclosed and insulated. There is a dedicated heater vent into this area. So whenever you are running the heater you are also pumping warm air to the storage tank area to keep them from freezing. A nice side effect is the floors in the bedroom stay nice and warm.