Review on Mr Heater F215100 3800 BTU Propane by Nathan Issa

He tested a small room the size of a bathroom to about 85 degrees. Went on smoothly. A one pound bottle lasted about 7 hours. The only negative (Miner) is that it is not regulated. Photos of the head of the unit are deceptive. It is very large and not portable for hiking. With proper ventilation this is a fantastic little heater to have as a backup should the heater on wheels fail. Care must be taken to ensure that this and all other low pressure heaters in enclosed spaces are properly vented. Use a CO2 monitor.