Mr Heater MH18B Heater
While electric heaters can be compact, a gas heater like the Mr Heater MRH-MH18B can provide much more heat at 180,000 BTUs per hour, and does not rely on access to electrical power. This unit can use...
Pros: Good heat, nice construction, easy to use and maintain
Cons: Produces carbon monxide, Propane cylinders relatively expensive