2500 Sq. Ft. Coal Only Warm Air Furnace

2500 Sq. Ft. Coal Only Warm Air Furnace

The US Stove Hot Blast 1500 add on furnace is designed to use in conjunction with your existing HVAC ductwork and work seamlessly with your existing furnace. With twin 500 CFM blowers and up to 139,000 BTUs, it is designed to heat a home up to 2,500 Sq. Ft. This coal only unit is made with a firebrick lined plate steel firebox surrounded by black painted steel giving the unit an eye appealing look. Connection to your existing ductwork is easy with the two 8 inch diameter heat outlets. Available accessories include the universal filter box kit (UFB908) and the barometric damper regulator (DR-6). The optional draft inducer kit (model 11DIKL) can be installed to allow the furnace to be thermostatically controlled and gives the option to change the on/off times of the distribution blower(s).

  • Model #: 1500

  • Features
    • Heats up to 2,500 Sq Ft with 139,000 BTUs
    • For use with coal only
    • Removable/replaceable shaker grates with handle included
    • Firebrick lined to boost efficiency and heating capacity
    • Firebox dimensions: 20-in W x30-1/2-in D x 19-1/2-in H
    • Separate ash door with removable dump pan
    • Dual 8-in diameter heat outlets for easy connection to existing ductwork
    • Twin 500 CFM blowers provide redundancy and large amounts of air flow
    • Automatic bi-metal draft damper in door
  • Specifications
    Product EPA Approved No
    Product Cooktop No
    Product Vent Location Rear
    Product Firebox Depth (in) 30.5
    Product Removable Water Reservoir No
    Product ETL Listed Yes
    Product Temperature Gauge No
    Product Venting Required Yes
    Product Heating Area (ft²) 2500
    Product Stove Type Freestanding
    Product Manufacturer Warranty Limited Lifetime firebox warranty, 1 Year all other parts, 1 year Electrical parts
    Product CSA Certified Yes
    Product Vented Or Vent-Free Vented
    Product Firebox Width (in) 20
    Product Brick-Lined Firebox Yes
    Product Vent Diameter (in) 6
    Product Pedestal Base Included No
    Product Firebox Height (in) 19.5
    Product Air Wash System No
    Product Outside Air Kit No
    Product Heater Type Outlet
    Product Package Contents Coal Furnace with Blowers
    Product Ash Drawer Yes
    Product Blower Yes
    Product Catalytic/Non Catalytic Non Catalytic
    Product UL Listed No
    Product Auto Ignition No
    Product Maximum BTU 139000
  • Dimensions
    Assembled Width (in) 24.06
    Package Weight 485
    Package Width 46
    Package Height 47.5
    Assembled Depth (in) 49.125
    Package Depth 30
    Assembled Height (in) 40
  • Other
    MFG Brand Name US Stove Company
    Does this Product Have a Warranty? Yes
    MFG Model # (Series) 1500
    Manufacturer Warranty Limited Lifetime firebox warranty, 1 Year all other parts, 1 year Electrical parts
    Warranty Type Limited - Parts
    Search Keywords Furnace, fireplace, coal, whole house, heater, hearth
    Warranty Type of Effective Date Purchase Date
    UPC 012685015019
  • Regulatory
    California Proposition 65 Warning Required Yes
    California Prop 65 Warning Label (Text) This product can expose you to chemicals including carbon monoxide, which is known to the State of California to cause cancer. For more information, go to www.P65Warnings.ca.gov.
    Contains Chemicals that Cause Cancer (Calif Prop65) Yes
    Item has Restrictions? Yes
    List the Chemicals contained that cause Cancer per California Proposition 65 Carbon Monoxide
  • FAQs
    • What is a draft induction kit?
      • Draft Induction Kits are optional accessories that are available to help a furnace burn coal more efficiently. They can be used when burning wood only, but are usually not necessary and can cause over-heating if the flue and intake dampers are not adjusted properly.
      • Draft kits work by forcing air into the firebox using a draft induction blower.
      • This draft blower is controlled by an external wall thermostat.
      • When the thermostat is calling for heat the draft blower will turn on to stoke the fire.
      • This causes the temperature inside the firebox to rise.
      • Once temperatures are up above about 150°F (factory ON setting for Honeywell Limit Control) the distribution blowers will turn on and circulate heat through the supply duct line.
      • When the thermostat’s set temperature is met the draft blower will turn off.
      • The temperatures inside the firebox will lower and the Honeywell Limit Control will turn the distribution blowers off at about 100°F (factory OFF setting for the Honeywell Limit Control).
      • This cycle continues for the life of the fire.
    • What happens if I don't have an air return?
      • Furnace could be unable to push enough hot air through the heating ducts.
      • The fuel will not combust properly.
      • Furnace or furnace components can overheat.
      • Chimney will not draft correctly.
    • Do I need to install a return air supply?
      • Return air can be provided by installing a separate duct system or by tying into the cold air return of an existing gas or oil furnace.
      • The cold air return duct can be connected to the furnace with either a factory manufactured USSC filter box or an equivalent fabricated from sheet metal.
      • When installing a cold air return, the minimum size shall be a 16” x 20” or equivalent (320 sq. in.) in order to insure proper furnace performance.
      • A filter should be installed in the cold air return. Furnace filters should be checked and cleaned/replaced regularly.
      • If return air is not provided, the warm air distributed into the home will be restricted and the efficiency of the furnace is decreased.
      • Without a return air system, warm air will be drawn into your basement, unnecessarily heating unused areas of the home.
      • In extreme cases, if the room in which the furnace is located is fairly airtight, the blowers on the furnace could depressurize the room and pull toxic flue gases from the furnace. The fumes could then be distributed throughout the home.
      • Air registers allow the furnace to bring in air to help circulate the heat that is created by the furnace.
      • These registers are normally located low to the ground in different areas around the home in order to capture the colder air that sinks to the floor.
      • Once inside the air return duct, the colder air is pulls through the ductwork back to the furnace where it is filtered, heated and sent back through the supply air vents.
      • An installation that does not include a return air duct will not be able to circulate heat throughout a home.
      • Also, with no return air duct system, a negative air pressure situation is created and will lower the amount of available combustible air. This can affect the draft in the chimney and cause smoke spillage.
    • What are the installation requirements of a furnace?
      • It is recommended that there be at least 20ft of vertical chimney length.
      • The size of the flue needs to be the same size throughout the entire length of the installation.
      • No more than 180° in elbows. (This restricts draft)
      • For every 1ft of horizontal length there needs to be a ¼” rise.
      • Termination must include a UL approved rain cap.
      • All venting must be made by the same manufacturer.
        • Small variations between pipe manufacturers can lower efficiency of the chimney and pose a safety hazard!
      • After roof penetration: 3-2-10 rule must be followed.
        • There must be a minimum of 3 ft of piping past the point of penetration.
        • The termination must be 2 ft above anything within a 10 ft radius.
    • My furnace is able to burn coal. What types of coal should I use?
      Anthracite Coal (an-thruh-sight)
      • Harder coal that burns cleaner.
      • Much more difficult to use.
      • Not as available and much more expensive
      • SIZE: egg or broken egg (2 5/16” up to 4 3/8” in diameter).
      Bituminous Coal (bi-toom-uh-nus)
      • Softer coal that burns dirtier.
      • Requires more cleaning because more soot will collect on heating surfaces and pipes.
      • SIZE: large nut to small egg (1 3/4” to 4” Diameter).
Document File Type File Size Product
1500 Owners Manual application/pdf 3 MB Download️
1500 Furnace Warranty application/pdf 146 KB Download️
  • What is a draft induction kit?
    • Draft Induction Kits are optional accessories that are available to help a furnace burn coal more efficiently. They can be used when burning wood only, but are usually not necessary and can cause over-heating if the flue and intake dampers are not adjusted properly.
    • Draft kits work by forcing air into the firebox using a draft induction blower.
    • This draft blower is controlled by an external wall thermostat.
    • When the thermostat is calling for heat the draft blower will turn on to stoke the fire.
    • This causes the temperature inside the firebox to rise.
    • Once temperatures are up above about 150°F (factory ON setting for Honeywell Limit Control) the distribution blowers will turn on and circulate heat through the supply duct line.
    • When the thermostat’s set temperature is met the draft blower will turn off.
    • The temperatures inside the firebox will lower and the Honeywell Limit Control will turn the distribution blowers off at about 100°F (factory OFF setting for the Honeywell Limit Control).
    • This cycle continues for the life of the fire.
  • What happens if I don't have an air return?
    • Furnace could be unable to push enough hot air through the heating ducts.
    • The fuel will not combust properly.
    • Furnace or furnace components can overheat.
    • Chimney will not draft correctly.
  • Do I need to install a return air supply?
    • Return air can be provided by installing a separate duct system or by tying into the cold air return of an existing gas or oil furnace.
    • The cold air return duct can be connected to the furnace with either a factory manufactured USSC filter box or an equivalent fabricated from sheet metal.
    • When installing a cold air return, the minimum size shall be a 16” x 20” or equivalent (320 sq. in.) in order to insure proper furnace performance.
    • A filter should be installed in the cold air return. Furnace filters should be checked and cleaned/replaced regularly.
    • If return air is not provided, the warm air distributed into the home will be restricted and the efficiency of the furnace is decreased.
    • Without a return air system, warm air will be drawn into your basement, unnecessarily heating unused areas of the home.
    • In extreme cases, if the room in which the furnace is located is fairly airtight, the blowers on the furnace could depressurize the room and pull toxic flue gases from the furnace. The fumes could then be distributed throughout the home.
    • Air registers allow the furnace to bring in air to help circulate the heat that is created by the furnace.
    • These registers are normally located low to the ground in different areas around the home in order to capture the colder air that sinks to the floor.
    • Once inside the air return duct, the colder air is pulls through the ductwork back to the furnace where it is filtered, heated and sent back through the supply air vents.
    • An installation that does not include a return air duct will not be able to circulate heat throughout a home.
    • Also, with no return air duct system, a negative air pressure situation is created and will lower the amount of available combustible air. This can affect the draft in the chimney and cause smoke spillage.
  • What are the installation requirements of a furnace?
    • It is recommended that there be at least 20ft of vertical chimney length.
    • The size of the flue needs to be the same size throughout the entire length of the installation.
    • No more than 180° in elbows. (This restricts draft)
    • For every 1ft of horizontal length there needs to be a ¼” rise.
    • Termination must include a UL approved rain cap.
    • All venting must be made by the same manufacturer.
      • Small variations between pipe manufacturers can lower efficiency of the chimney and pose a safety hazard!
    • After roof penetration: 3-2-10 rule must be followed.
      • There must be a minimum of 3 ft of piping past the point of penetration.
      • The termination must be 2 ft above anything within a 10 ft radius.
  • My furnace is able to burn coal. What types of coal should I use?
    Anthracite Coal (an-thruh-sight)
    • Harder coal that burns cleaner.
    • Much more difficult to use.
    • Not as available and much more expensive
    • SIZE: egg or broken egg (2 5/16” up to 4 3/8” in diameter).
    Bituminous Coal (bi-toom-uh-nus)
    • Softer coal that burns dirtier.
    • Requires more cleaning because more soot will collect on heating surfaces and pipes.
    • SIZE: large nut to small egg (1 3/4” to 4” Diameter).

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