Hi,
We have a 2003 5210 with heated tanks and a single house battery. I have never used the heated tank option but I can tell you that with our unit, the furnace blower is 120v and will only work when the rig is hooked to shore power or the generator is on line. Our refrigerator is gas/electric but needs 120v for the electric bit.
The house battery really only services the interior lights, the electric steps and the vent fan in the bathroom.
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