only $9,995


Patent-pending design changes heating from the inside out.

Burns hotter. Cleans easier. Lasts longer.

WoodMaster’s CleanFire uses a dry fire chamber to provide hotter, more efficient heat that requires minimal effort to maintain.

No ceramics
No damaging corrosion
No creosote build-up

The primary boiler is a true low pressure ASME H stamped boiler. It keeps oxygen out of the system, preventing corrosion to the water vessel. ASME certification ensures the use of the highest quality materials and workmanship resulting in a boiler life expectancy of 40 or 50 years.

All of it is run by the exclusive WoodMaster control board, which burns at the optimum rate to meet the heat load. No batch burning or quick cycling. The board uses more than 300 settings to maintain this furnace modulation, increasing efficiency.

Click here for the owner’s manual

The CleanFire 400 Walkthrough Video

The CleanFire 400 Features and Benefits Video


  • BTU/HR – 88,750 BTU/HR output on an 8 hour burn
  • Max BTU – 102,400
  • Efficiency – 67.26% weighted, 73% efficiency on high burn
  • Emissions – 0.065 LBS/MMBTU
  • Water Capacity – 55 gallons of water
  • Fire Chamber Dimensions – 28″L x 30″W (approximate)
  • Door Size – 16.5″W x 19″H (approximate)
  • Dry Weight – 2,885lbs
  • Boiler height – 84”
  • Boiler width – 56”
  • Boiler Depth – 74.5”


  • ASME certified pressured vessel
  • Dry fire chamber
  • Minimal maintenance
  • Non-cycling, modulates for heat load


  • Large fuel door for ease of filling.
  • Spring loaded door latch maintains pressure and ensures a tight seal.
  • Two part door, very insulated. Greatly reduces heat transfer to the outside.


  • Patent pending design
  • A dry fire chamber means no creosote build-up, no ash corrosion, and no need for ceramics.
  • Pre-heated combustion air.
  • Made from 8 gauge steel.
  • Very long lasting due to no creosote.
  • Extremely easy maintenance, can be cleaned in a few minutes


  • Primary and secondary air ducts equipped with 2 dampers to allow for optimal burn.
  • The remaining gasses leaving the combustion chamber are mixed with oxygen in the injection tube ensuring a complete combustion through the catalyst.
  • The catalyst temperatures are controlled to ensure clean combustion and longevity.
  • The heat is recovered in the heat exchanger, then exits the chimney.
  • The stack averages an optimal temperature to remain efficient, yet not condense. (approx. 240 degrees)
  • The CleanFire is equipped with a lambda sensor which monitors the oxygen levels and adjusts the boiler to maintain the optimal burn.


  • The control is designed to read water temperature in and out, and adjust the boiler automatically to satisfy the heat load.
  • It adjusts the fan and primary and secondary air dampers based on heat load and water temp needed.
  • This is not a cycling boiler; it modulates for the heat load needed.
  • Ability to connect to wifi, or basic internet, for in home monitoring or it can link to your smart phone.
  • Built in protection to keep the catalyst from overheating.
  • The control display- displays water temp, catalyst temp, crossover temp, O2 level, boiler pressure (max. 30 psi), lighting feature, allows for a brief history of alarm details


  • Very minimal maintenance.
  • The heat exchanger tubes should only need to be cleaned twice a year.
  • The ash in the bottom chamber of the heat exchanger needs to be cleaned as needed, again, very minimal.
  • Separate blow down valves for each vessel.
  • Pump conveniently located in the house.
  • Equipped with 1 1/4″ plumbing for single or double hook-ups.
  • Equipped with four chimney tie downs. Guy-wire ready for extended chimney.
  • Programmable LED lighting


  • Low water cutoff
  • High limit control
  • Pressure relief valve


  • Can add autofill to the boiler so you never have to worry about low water.
  • Two pressure release valves
  • Offers colors of charcoal, green, brown and black.
  • Can heat up to two zones and 4,000 square feet.