I replaced a wood stove with a Vermont Castings Reliance (propane) about 15 years ago.It is 38,000 BTU' s if I remember right.Start it in November and runs until spring.Mine is connected to a milli-volt thermostat and starts and stops by itself.Trouble free and easy.Just had my tanks filled this morning;I burn about 700 gallons per year but that also includes my propane unit heater in the garage.
Absolute best purchase I have made period.Best thing is that it requires no power to provide heat.I have a ceiling fan in the room that it is located and didn't purchased the small fan that installs in the stove itself.
Mine is a vented unit;they also make them unvented(my daughter has one and is happy with it).
My son also has the same unit in his house;mostly as a back-up for his out-side wood eater.