Using house furnace in an RV ?

tatest wrote:
Wall furnaces are still made, like this one which is probably too big, but the type was once common in RVs.

I had one in the back extension of my old house, to complement the floor furnace heating heating the original front of the house, but it was eventually replace with a ducted forced air system, to enable whole house air conditioning.

I think there is a reason these are no longer used in RVs, where air supplies are low because of small volumes and a tighter box than formerly. Note that you are suppose to open windows and run a forced air vent, just to use the range, which is a much smaller combustion source than these furnaces, even with all burners going.

Yes, there is more to heating any space using combustion than just connecting the supply of fuel and starting the flame. Both combustion exhaust and fresh air supply will need to be thought out carefully and there should be some diligence about how the interior environment is subjected by the heater. Using a heater that requires a window to be opened or an air grate for supply is somewhat backwards, IMO. There is also the flue gas volume and where that will be drawn from. Most flues use three or four times the amount of air that is used for combustion. That flue air usually comes from the adjacent area and must be replaced by air from somewhere. Typically, it's replaced by small cracks and leaks in the structure. I piped in combustion air and flue air with a 1 1/2" pipe that draws from the outside. I have a full flow valve on that pipe so it can be closed when not in use. I don't have to have windows open but I usually leave a ceiling vent cracked to help dissipate moisture and allow for some fresh air to enter.

Picture of Sportsman heater: