Williams direct vent propane heater. Requires no electricity. However, it does come with a circulating fan if electricity is available. 22,000 BTU/hour. Comes with thermostat and exhaust/fresh air vent. Conversion kit available from the manufacturer to convert from propane to natural gas. $375.00.
As the picture shows, it is mounted halfway up the wall. That is because of the cement block wall. It your situation allows, it could be located right on the floor which would make for more even heating.
I live in Willow but drive to Anchorage usually once a a week and could meet you in town or any place in between.