My 2017 Freedom Elite 26HE didn’t have a “primitive “ heating system such as you describe. But perhaps you mean it doesn’t have a heated basement like some rigs have and that is true. The tank is under the dinette seat and so is within the heated cabin. So is the water pump. It’s under the other dinette seat and the water lines connecting them are also above the floor. I think that if you keep the cabin comfortable you should be fine in all but the coldest temps. You could probably help your cause by cutting one or two large holes under the seats (ie under the table) and covering them with home style return air vent grills from a home center.
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