The sum of all electrical components is 5.45 amps max. This furnace is designed to operate on a standard 15-amp residential electrical outlet.
Up to 2,000 sq ft comfortably.
I have included the clearances to combustibles from the manual Clearances: Unit must be placed on a non-combustible floor. This floor must extend at least 16 inches in front of, and 8 inches on either side of, the fuel loading and ash removal doors; underneath the chimney connector; and 2 inches on either side of the chimney connector. The furnace must maintain the following clearances to combustibles: • Heat plenum = 2 inches • Chimney connector = 18 inches • Front = 48 inches • Rear = 12 inches • Sides = 6 inches • Main furnace = 12 inches For the second answer, the only fan to use with the wood furnace is the one that comes with the unit. When using as a secondary furnace with existing ductwork, use one furnace or the other but not both at the same time.
I have a 2000 square foot house and it heats it with no problem.
The furnaces are manufactured in St. Louis, MO. The distribution blower is rated at 1800 cfm. If you have any other questions please do not hesitate to contact our office at 1-800-875-4788. Thank you!
The Shelter SF 4200 Outdoor Furnace is rated at a maximum heating up to 4000 square feet. This rating is based on a well insulated home with insulated glass and low air leakage. So if the home is older with old windows, air leakage and poor insulation then the furnace might only heat up to approximately 3000 square feet. It all depends on the demand for heat to keep the home warm. Homes with high ceilings over 9 feet generally require more heat and the use of ceiling fans to push the heat down to the floor. Some people with extremely well insulated air tight homes can heat even more then 4000 square feet. Please remember this is a forced air furnace and thus must have the warm air distributed efficiently through out the home to work well. This same air must be able to return to the furnace easily and be heated again and again for the furnace to perform properly. Thank you for your question.