SF3500 Coal Furnace

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The SF3500 is a hot-air furnace built to maintain clean, consistent temperatures throughout your entire home. An advanced filtering system and automatic blowers help ensure warmth and comfort all year round.

  • 170,000 BTUs — heats 2,400 to 4,200+ square feet, based on climate and home efficiency
  • Legacy Stoves Grate System extends heating by completely burning fuel to fine ash
  • Spiral chamber ensures consistent heat levels
  • 22" maximum log length (Wood for fire startup only!*) / pea, nut or stove-sized coal

Key Features and Technologies

Limited Lifetime Warranty Icon
Limited Lifetime Warranty

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BTU Output and Maintenance for SF-3500

BTU/Hour Output

(Wood for fire startup only!*)(Wood for fire startup only!*)The amount of heat produced by a heating appliance is measured in British Thermal Units (BTUs). One BTU represents the amount of energy required to raise the temperature of 1 lb. of water by 1 degree F.

Generally, more BTUs correlate to greater heating potential. However, the amount of BTUs needed to heat a specific area varies, based on climate and home efficiency.

Get the most out of your hearth product by staying up-to-date on basic maintenance and care. Some annual maintenance activities you can perform include:

  • Inspecting the chimney and termination cap (where the exhaust exits the home) for blockages, build-up or debris, and removing any obstructions
  • Inspecting and cleaning the glass, doors, fronts and surrounds with a non-abrasive cleaner
  • Removing ashes into a sealed container until disposal, and inspecting the fire grate
  • A certified hearth professional can help clean the chimney, and inspect all other fireplace elements. Plan to have a local professional clean/inspect your appliance annually. And always be sure your appliance is off and completely cooled before performing any maintenance.

Consult the installation/owner’s manual for more detailed information on maintenance.

*As of 2017, the hot air furnaces are no longer EPA approved for continuous firing with wood