Multi-Fuel Boilers


Ten Year Warranty

The WOC100 model comes with backup oil burner. It offers greater BTU output, has a larger firebox, and is equipped with a greater water and coal capacity than the WOC70 model.

Multi-Fuel units can burn a variety of fuels with high efficiency. Our trademark perforated grate system makes it possible to burn various types of solid fuels in the same combustion chamber, and to customize the airflow and burn efficiency with each kind of fuel.

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 use with wood.

The WOC units are fitted with a backup fuel option, with liquid fuel backup capability include a separate combustion chamber where fuel oil, natural gas, or propane can be burned. This chamber is water jacketed for its entire length for excellent heat exchange and efficiency.

The Multi-Fuel Boilers are available in four standard sizes with varying BTU output. All units are traditional, hand-fired, updraft boilers. For automatic feeding boilers please explore our Wood Gun or Coal Gun product lines.

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  • Flexible Fuel Options
  • Easy Maintenance
  • Cost Effective
  • Fuel Efficient
  • Lifetime Durability

Call (717) 987-0099 for pricing

Assembled Specifications

BTU/hr Coal


BTU/hr Oil or Gas


Typical Heating Capacity (square ft)


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)


Weight (lbs)


Flue Size (in)


Coal Capacity (lbs)


Propane/Natural Gas Backup

Fuel oil backup is standard for WOC models but propane or natural gas back up options are available for an additional cost.

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.