Mini-catalytic heater for keeping tanks warm off-grid??

I would look at redirecting one (or more since you dont mind the cold inside) lines off your furnace to the underbody. I have one routed down in mine and the furnace runs often enough that I have no worries...as long as I don't run out of gas for too long.

This wont be quiet...but it sure is safe and easy.


Insulating the tank and whatever else wont help much at all because its the small 1/2" sections of pipe routed all over and small lines going to end points that will freeze first.