Golden has the answer. FA furnaces use a LOT of amps to run all nite. We have the Wave 6 (mid-size) Olympic catalytic heater and it keeps our 250sf 28ft. trailer w/slide warm into the teens. No problem running it all nite, and usually on low to medium setting. Just keep two windows slightly cracked for fresh air that the catalytic needs. Have heard that the Olympic has been around longer than most all of them, and is one of the safest flame free heaters around. One should have a good quality CO moniter in all cases, and especially when running a catalytic heater.