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We are using a Webasto Airtop st3500, its a diesel or kerosene forced air heater, very efficient, doesn’t suck down power like RV furnaces do, and quite compact.
Webasto Airtop 2000 ST. Runs Off Fuel Tank (1 Gal. Gas Per 24/Hour Run Time). 1 Vent Located By 3 Drawer Cabinet. LED Thermostat Control w/ Timer Fan Modes—Ventilation Without Heat.