Forge coal furnace logo

The Central Boiler Forge outdoor coal furnace is a cleaner way to heat with coal.

Door - 18"W x 18"H

Firebox - 40" x 30" x 26"

Heat Transfer Area - 52 sq ft

Ash Cleanout Door - 19"W x 11"H

Grate Size - 6" x 16-7/8"

Water Capacity - 150 gal.

Weight - 1,750 lbs

Supply/Return Ports - 1 set of 1-1/4" supply and return ports (can be configured for two pumps)

Btu Rating - 150,000 Btu/hr

NOTE: Specifications are subject to change without notice. 

  • Heat Multiple Buildings - Heating multiple buildings is easy. The Forge 1500 has one set of 1-1/4” supply and return ports (that can be configured for two pumps).
  • Automatic Operation - The FireStar® combustion controller monitors all functions of the furnace and automatically adds air when and where it is needed (over or under the fire, or both) for a cleaner and more efficient burn.
  • Fine-tune Controller Settings - Operator-adjustable settings on the controller allow you to fine-tune operation for maximum efficiency with each coal type. For example, you can adjust for maximum heat output that saves energy or adjust the amount of over fire air at initial startup.

Monitor your furnace from anywhere

  • Stay Connected - Stay connected from almost anywhere in the world to the furnace that saves you money on your heating bills. The FireStar® combustion controller features integrated wi-fi that keeps you in constant contact with your furnace if you're away. View real-time operational information like water temperature, historical charts that show you how the furnace has been operating, and even get texts or emails when an alert situation occurs. *Requires data plan, internet access, router and compatible device.
  • Convenient Operation - Loading coal is easy with the large firebox door. Ergonomically designed, the firebox door is insulated and easy to open and close. Heavy-duty shaker grate, conveniently operated by handle on side of the furnace, allows ash to fall below into the ash collection area. Ash removal is easy.
  • Burn Less Coal - A hallmark of Central Boiler furnaces for over 30 years, spray-on urethane is the ultimate airtight, waterproof insulation that locks the heat in to reduce coal usage, even at temperatures of -35˚F or colder. It provides 2-3 times the effective R-value of conventional fiberglass batt insulation.
  • Safety Tested/Listed
  • 5-Year Warranty Available
  • Made in the U.S.A.
Color Options

Color selections are close representations but are limited by processing and viewing conditions.

charcoal and bronze outdoor furnace swatch
Charcoal / Bronze

Door - 18"W x 18"H

Firebox - 50" x 36" x 30"

Heat Transfer Area - 74 sq ft

Ash Cleanout Door - 19"W x 11"H

Grate Size - 6" x 16-7/8"

Water Capacity - 210 gal.

Weight - 2,150 lbs

Supply/Return Ports - 1 set of 1-1/4" supply and return ports; 1 set of 3/4" supply and return ports

Btu Rating - 350,000 Btu/hr

NOTE: Specifications are subject to change without notice. 

  • Heat Multiple Buildings - Heating multiple buildings is easy. The Forge 3500 has one set of 1-1/4” supply and return ports and one set of 3/4” supply and return ports.
  • Automatic Operation - The FireStar® combustion controller monitors all functions of the furnace and automatically adds air when and where it is needed (over or under the fire, or both) for a cleaner and more efficient burn.
  • Fine-tune Controller Settings - Operator-adjustable settings on the controller allow you to fine-tune operation for maximum efficiency with each coal type. For example, you can adjust for maximum heat output that saves energy or adjust the amount of over fire air at initial startup.

Monitor your furnace from anywhere

  • Stay Connected - Stay connected from almost anywhere in the world to the furnace that saves you money on your heating bills. The FireStar® combustion controller features integrated wi-fi that keeps you in constant contact with your furnace if you're away. View real-time operational information like water temperature, historical charts that show you how the furnace has been operating, and even get texts or emails when an alert situation occurs. *Requires data plan, internet access, router and compatible device.
  • Convenient Operation - Loading coal is easy with the large firebox door. Ergonomically designed, the firebox door is insulated and easy to open and close. Heavy-duty shaker grate, conveniently operated by handle on side of the furnace, allows ash to fall below into the ash collection area. Ash removal is easy.
  • Burn Less Coal - A hallmark of Central Boiler furnaces for over 30 years, spray-on urethane is the ultimate airtight, waterproof insulation that locks the heat in to reduce coal usage, even at temperatures of -35˚F or colder. It provides 2-3 times the effective R-value of conventional fiberglass batt insulation.
  • Safety Tested/Listed
  • 5-Year Warranty Available
  • Made in the U.S.A.

 

Color Options

Color selections are close representations but are limited by processing and viewing conditions.

charcoal and bronze outdoor furnace swatch
Charcoal / Bronze