I agree with Highbeam ,do the math 500 gallons of propane a year. Your heat load is low and could be meet with a much smaller unit costing much less money. Both units sound like solid performer but might be overkill in your application. I can kill a squirrel with a 30-06 , but usually just use the 22lr when squirrel hunting. Not trying to step on anyone choice in equipment, just looking at the application and the choices seem large .