Mr Heater Buddy

I used one last winter to heat my 25'ft.wheel in temps that were in the teens. Tried the small bottles which lasted about 3-5 hours depending on the heaters setting. I also hooked up a 20 lb.tank with an extension hose. I have no idea how long that would last as I just used the heater to do some work in the rig. It heated the camper to 70 -72 degrees in no time, can't attest to the condensation issue others have mentioned as I didn't experience it. Yes Big Buddy advises to crack a window. Also if running a large tank with an extension you do not need a fuel filter if the hose has a regulator.