The Antarctic Floor Mounted Heater is ideal for boats 35ft 40ft. Size of this heater produces greater heat output than the smaller heaters although fuel consumption is the same. This model is round in design and has a large viewing window. Includes 12v draft assist fan. Features Type Rain Exhaust Cap. Requires 3 diameter chimney parts. Minimum 4ft or maximum 8ft of chimney is required, a straight run with no elbows work best. Chimneys 6ft or longer we highly recommend a barometric damper. Permanent fresh air vent needed in area of the unit. Creates a dry heat to dry out moisture inside the vessel. This model has a larger combustion chamber so more heat is produced than the Alaska and Newport heaters. In sailboat installations, this unit must face fore or aft, if facing port or starboard is desired, the valve would need to be mounted to the side of the unit so the gravity fed valve won't starve the burner on heels up to 15 degrees. 12v draft assist fan included can be converted to 24v and 32v . Used for start up and draft assistance on high fire. Valve is calibrated for diesel but can be re-calibrated for kerosene or stove oil. Specifications Overall Dimensions 13 W x 14 D x 25 H . Fuel Consumption/24hr 1.29 gal Low/3.20 gal High. Heat Output Low 6500 BTU/High 16250 BTU.