WC100 Multi-Fuel Boiler

Ten Year Warranty

The WC100 is our biggest Multi-Fuel boiler. With a max output of 400,000 BTU/hr, it can heat buildings ranging from 7,000 to 11,000 sqft. It is ideal for residential and commercial owners searching for a sturdy, long-lasting boiler with the capability to heat a mixture of fuels.

The WC100 Multi-Fuel Boiler comes standard with:

  • Legacy Grate System
  • Massive 16” 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
  • Built of ¼” Steel
  • Honeywell Control Aquastat
  • Temperature/Pressure Gauge
  • ASME Approved Pressure Relief Valve
  • Load Door Smoke Flap

The WC100’s cost is one of the most economically viable! The average cost of ownership is only $40.00 – $80.00 per year!

Conventionally, Multi-Fuel boilers have been marketed as wood/coal combinations. However, thanks to EPA Phase 2, these units are no longer marketed for ongoing use with wood.

Want a liquid fuel backup option for the best flexibility? Come take a look at our WOC100 model.
For automatic feeding boilers, please browse through our Wood Gun or Coal Gun product series.

  • Pressurized Vessel
  • Flexible Fuel Options
  • Easy Maintenance
  • Cost Effective
  • Fuel Efficient
  • Lifetime Durability
Call For Pricing(717) 987-0099
Assembled Specifications



BTU/hr Oil or Gas


Typical Heating Capacity (square ft)

7,000 - 11,000

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.