I'm sorry for the confusion. I should have mentioned that I am off grid full timer.
Very aware of the heated basement and know all about winterizing. We lived in New Hampshire for 20 plus years.
Out here in Quartzsite I'm not worried about black/grey/water tanks freezing, does not get that cold.
Need suggestions for ventless propane heater. Not a portable with a small tank.
Current furnaces extremely inefficient with both DC and propane!
Going to connect external tank and going to plumb a portable ventless heater.
Would like to hear from other full timers that winter in their rigs.
Thanks for the replys