I used two of these in my Large bunk Semi, to heat it all winter long, and except for the coldest nights, one was plenty on the low setting, (750 W.) I had a 8500 K. diesel generator, and it did not know when they were on or not! They moved a lot of air, and that is the trick, for these type of heaters to work good! They lasted for years, quiet, and worked! When I bought them, they were 79.00 dls, so have come down in price since!
Stanley 1500-Watt Utility Ceramic Portable Heater with ...
Retired, and "Always on Holiday!"
1996 Monaco Windsor 38PB, "Mona" 275 HP., 8.3 Cummins, 3060 Allison 6 speed, 2001 PT Cruiser, "Bailey"