WC40 Multi-Fuel Boiler

Ten Year Warranty

The WC40 model is our smallest Multi-Fuel boiler, able to heat homes ranging from 1,000 to 4,000 sqft. It is perfect for homeowners looking for a rugged, durable boiler that can burn a variety of fuels.

The WC40 Multi-Fuel Boiler comes standard with:

  • Legacy Grate System
  • Large 14” Loading Door
  • Automatic Dual Draft System – Forced Draft Blower and Natural Draft Damper
  • Firebrick Lined Firebox
  • Water Cooled Baffle (for increased efficiency)
  • Hydro Tested to 60PSI
  • Constructed of ¼” Steel Plate
  • Honeywell Circulator Control Aquastat
  • Temperature/Pressure Gauge
  • ASME Tested Pressure Relief Valve
  • Load Door Smoke Flap

Our Multi-Fuel boilers’ cost of ownership is one of the lowest in the industry—$35.00 – $45.00 per year on average!

Traditionally, Multi-Fuel boilers have been sold as wood/coal combinations. However, due to EPA Phase 2 regulations, these units are no longer sold for continuous use with wood.
Want a liquid fuel backup option for ultimate flexibility? Check out our WOC40 model.
For automatic feeding boilers, please explore our Wood Gun or Coal Gun product lines.

  • Water-Cooled Baffle
  • Flexible Fuel Options
  • Easy Maintenance
  • Cost Effective
  • Fuel Efficient
  • Lifetime Durability
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Assembled Specifications



BTU/hr Oil or Gas


Typical Heating Capacity (square ft)

1,000 - 4,000

Weight (lbs)


Flue Size (in)


Fuel Type

Wood*, Hard Coal, Soft Coal

Optional Backup Fuel


Standard Door Opening


Firebox Capacity (cubic ft)


Firebox Length (in)


Water Capacity (gal)


Width (in)


Height (in)


Height to Flue Opening (Center) (in)


Depth (in)


Coal Capacity (lbs)


Electric Requirements

110V, 60Hz, 15Amp

Alternate Heating

Domestic Coil

This Domestic Coil features a 100° F rise at 5 gallons per minute, 50° water inlet temperature and 65 PSI water pressure. It is threaded into a 4 IN NPT threaded fitting provided on the boiler for this purpose.

Oil/Propane/Natural Gas Backup

The Multi-Fuel boiler can be fitted with a backup fuel option. This option requires a dedicated firing chamber for the boiler that must be built in to the vessel during manufacturing. This chamber is water jacketed for its entire length for excellent heat exchange and efficiency.

Automatic/Manual Switching

For #2 fuel oil, the backup system can function in an automatic switch-over scenario, with fuel oil taking over when the boiler has exhausted its coal fuel. For other fuels, such as natural gas or propane, switch-over is manual only.

Insulation Jacket

Our base unit Multi-Fuel boilers have no insulation on the outside of the boiler, allowing maximum heat radiation in the boiler room. If you prefer to circulate more of this heat, an insulation jacket can be added to the boiler. This insulation jacket is comparable to that used on the Wood Gun or Coal Gun boilers.

ASME Certification

The ASME Certification guarantees the steel grade and weld quality of the boiler water jacket. Each ASME Certified water jacket has been pressure tested to 60 PSI, and includes a 30 PSI release valve.

Low Water Cutoff

A Low Water Cutoff senses the water level in the boiler’s vessel and will shut the unit down if the water level drops to an unsafe level. Available with automatic reset or manual reset.