Wood Coal Multi-Fuel Boilers

Multi Fuel Boilers are Eligible for Our Discount Program!

Alternate Heating Systems Coal-Wood Multi-Fuel Boiler
The air-cooled Rolla-Grate triangular rotary grate system is the heart of the Alternate Heating Systems Coal-Wood Multi-Fuel Boiler. This remarkable system adjusts to maximize burning efficiency for each fuel and provides a convenient method of removing expended ash from the boiler's firebox. The triangular grate design is made with a hollow core allowing airflow via convection in order to keep the grate cool. This cooling effect prevents warping of the grate components. Depending upon the model purchased there is a minimum of three grates. The boiler is designed so that each grate can be shaken or rotated individually so that ash can be removed only from areas where expended fuel has built up. Refractory-lined baffling diverts the exhaust through the boiler in order to reclaim as much heat as possible before the combusted exhaust goes out the chimney. Water tubes located beneath the refractory-lined baffle serve to capture this additional heat.

 

Standard Equipment On All AHS Multi-Fuel Boilers:

  • Rolla-Grate™ Rotary Grate System
  • Opening can be increased from nearly closed to large opening for burning coal
  • Large Loading Door
  • Full gasket for maximum efficiency
  • Smoke Flap
  • Water Cooled Baffles
  • Forced Draft Fan
  • Large Removable Ash Pan
  • Dual Draft System
  • Through-the-door draft system for burning wood. Below-grate draft system for burning coal.
  • Automatic Draft Control
  • Firebrick Lined Firebox
  • Hydro Tested to 60lbs PSI
  • Constructed of 1/4" Steel Plate Throughout vessel
  • Honeywell Circulator Control Aquastat
  • Temperature/Pressure Gauge
  • ASME Tested Pressure Relief Valve

Our Multi-Fuel Boilers are not to be confused with "converted" or "re-designed" single fuel equipment. Every Alternate Heating Systems, Inc. Boiler boasts design and engineering to operate efficiently and dependably on Wood, Coal, and Fuel Oil or Natural Gas/Propane.

 

Multi-Fuel Boiler Model Nomenclature
The following letters are used in designating boiler models and have the following meanings.
WC - Wood/Coal burning
WOC - Wood/Coal/Oil burning

 

Optional Equipment on AHS Multi-Fuel Boilers:

  • Riello Oil Burner. The Riello oil burner option is an excellent choice for burning oil in combination with burning other fuels - it is designed to let almost no air into the combustion chamber when not burning oil.
  • Domestic coil - factory installed (5 Gal. per min. max. output.)
  • Auto switch over
  • Soft Coal Linkage Kit (for burning bituminous coal)

Multi-Fuel Coal/Wood Boiler Specifications

Model: WC40 WC55 WC70 WC100
BTU/Hour Wood 120,000 180,000 220,000 350,000
BTU/Hour Coal 150,000 225,000 265,000 400,000
Water Capacity, Gallons 40 55 70 95
Firebox Capacity, Cubic Feet 7.5 10 14 22
Coal Capacity 125 lbs 200 lbs 250 lbs 400 lbs
Max Log Length, Inches 24 24 36 38
Standard Door Opening 14" x 14" 14" x 14" 14" x 14" 16" x 16"
Height 44" 54" 59" 64"
Width 28" 28" 28" 34"
Depth 36" 36" 40" 50"
Height to Flue Opening (Center) 35" 45" 45" 50"
Flue Size 8" 8" 8" 8"
Weight, lbs 1,050 1,220 1,450 1,950
Typical Heating Capacity, Square Feet** 3,000 4,000 5,000 9,000
Specifications subject to change without notice

Multi-Fuel Wood/Oil (Gas, Propane)/Coal Boiler Specifications

Model: WC40 WC55 WC70 WC100
BTU/Hour Wood 120,000 180,000 220,000 350,000
BTU/Hour Coal 150,000 225,000 265,000 400,000
BTU/Hour Oil or Gas 225,000 225,000 250,000 400,000
Water Capacity, Gallons 44 59 75 100
Firebox Capacity, Cubic Feet 7.5 10 14 22
Coal Capacity 125 lbs 200 lbs 250 lbs 400 lbs
Max Log Length, Inches 24 24 36 38
Standard Door Opening 14" x 14" 14" x 14" 14" x 14" 16" x 16"
Height 44" 54" 59" 64"
Width 28" 28" 28" 34"
Depth 36" 36" 40" 50"
Height to Flue Opening (Center) 35" 45" 45" 50"
Flue Size 8" 8" 8" 8"
Weight, lbs 1,230 1,400 1,630 2,130
Typical Heating Capacity, Square Feet** 3,000 4,000 5,000 9,000

**Subject to building design and construction
Specifications subject to change without notice


Multi-Fuel Family Photos

Multi-Fuel Options

Multi-Fuel Brochure

 

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