multi pass series outdoor furnace

multi pass outdoor furnace


Built with a triple pass heat exchanger for higher efficiency, shaker grates & removable ash pan.

Also known as outdoor boilers, outdoor furnaces or hydronic heaters, Crown Royal Stoves Multi Pass outdoor furnaces are a non pressurized system, designed to be located next to your fuel storage for convenience, and are normally filled once or twice a day, depending on the temperature outside.

The shaker grate and ash pan design was purposefully designed for quick and easy cleaning. The introduction of combustion air under the grates gives a hotter and cleaner burn, while additional air is injected from above the fire, inside the firebox, reducing gases and heat loss up the chimney, producing a cleaner burn that uses less fuel.

The outdoor furnace Multi Pass Series is manufactured with triple pass heat exchangers and water filled heat exchanger tubes that produce the highest efficiencies of a conventional outdoor furnace; the bottom line is you will burn 30% - 50% LESS THAN THE COMPETITION. In addition to these features, it is equipped with a turbo draft fan that produces secondary combustion along with shaker grates and a removable ash pan for quick and easy cleaning. For the best corrosion resistance and heat transfer possible, our Crown Royal Stove outdoor furnaces firebox and outer drum is a round design constructed out of 409 Titanium Enhanced Stainless Steel.

Virtually any existing heating system can be converted into heating with a Crown Royal Stove outdoor furnace. The Multi Pass Series is available in two models. These two models range from 6,000 square feet to 10,000 square feet.

  • 409 Titanium Enhanced Stainless Steel
  • Shaker Grate System with Removable Ash Pan
  • Stainless Steel Heat Transfer Tubes
  • Fan Forced Draft
  • Smoke By-Pass
  • Class A Insulated Chimney
  • Non-Stick Door Gasket
  • Insulated - Walls R30, Roof R30
  • Water Level Indicator
  • Safety Latch Firebox Door
  • Digital Control Panel
  • Secondary Combustion
  • Triple Pass Water Filled Heat Exchanger
  • 20 Year Limited Warranty
  • No Mess in the House
  • Works with Any Existing System
  • No Carbon Monoxide Caused by Gas Fumes
  • Removable Ash Pan
  • Large Firebox & Loading Door
  • Cost Effective Heat Source
  • Multiple 1-1/4" Supply & Return Connections
  • Easily Removable Rear Access Door to Plumbing Connections
  • Light for Night Loading
  • Clean, Efficient & Safe
  • Low Maintenance
  • Lower Heating Costs
  • UL 391, UL 726 & CSA B366.1
  • Made in the USA

Some outdoor stove manufacturers who advertise that they offer a Lifetime Warranty, actually offer little to no warranty, but don’t disclose the details. Protect yourself and your investment, by always asking to see the full warranty.

Our 20 Year Warranty provides you the highest quality, longest lasting stove and warranty on the market.


  • Residential Homes
  • Pools/Hot Tubs
  • Domestic Hot Water
  • Radiant In-Floor Heating
  • Commercial Buildings
  • Greenhouses
  • Garages & Workshops
  • Barns & Agricultural Buildings


409 Titanium Enhanced Stainless Steel Firebox & Water Jacket

Developed to withstand the high temperatures of gasification, 409 Stainless Steel provides the best corrosion resistance, maximum heat transfer and strength needed for the firebox and water jacket.


Shaker Grate

  • Easy to Clean
  • The shaker grate design ensures a complete burn of your coal
  • The automatic forced air blower extends burn time and creates greater efficiency with hotter burns by introducing air under the grate


Removable Ash Pan

  • Extra Large Removable Ash Pan for Easy Cleaning
  • Large Ash Pan Door for Easy Access


Ultra-Temp Insulated Stainless Steel Chimney

  • Stainless Steel Inner and Outer Shell
  • Double Wall Insulated Chimney
    Easily Expandable, Interlocking Lengths Available

Turbo Draft System

  • Allows for a cleaner more efficient burn inside the firebox
  • Allows secondary gases to be burned before escaping out the furnace chimney


Water Level Indicator

Easy to read water level indicator will keep you informed when additional water must be added.


Easy to use Controls

  • Thermostatically controlled to offer an even heat throughout your home or business
  • Digital illuminated controls for easy reading
  • Economical and easy to replace


Triple Pass Heat Exchanger & Stainless Steel Heat Exchanger Tubes

  • Better Heat Transfer
  • Higher Efficiency
  • Uses Less Fuel
  • Faster Heat Recovery
  • Secondary Combustion

Cost Savings

  • Crown Royal owners can save approximately 50% - 100% of their annual heating costs.
  • Reduce or even eliminate hot water bills and the dependence on foreign fuels.



  • Depending on the outdoor temperature and size of the unit, our outdoor furnaces only need to be loaded once or twice a day.
  • Eliminate dirt, bark, ash, smoke, soot, or insects from inside your home. It now stays outside where it belongs.
  • Melt away snow from driveways and sidewalks effectively with proper installation requirements.


Manufactured with Safety in Mind

  • Eliminates the risk of a house fire, chimney fire, indoor smoke, or carbon monoxide poisoning.
  • Firebox Safety Latch System prevents door from swinging open too quickly.
  • Each Crown Royal Stove has been rigorously tested.


20 Year Limited Warranty


Heat with Wood, Coal, Corn, Wood Chips, Wood Pellets & More 


A closer look at the Multi Pass Series Outdoor Furnace


Estimated Weight:1,400 LBS1,800 LBS2,500 LBS5,000 LBS
Width:47 1/2"
Firebox Length:30-1/2"
Chimney Size:6"
Door Size:20" x 20"
20" x 20"24" x 24"42" x 32"
Supply Size:1 - 1 1/4"
2 - 1 1/4"2 - 1 1/4"4 - 1 1/4"
Return Size:1 - 1 1/4"2 - 1 1/4"2 - 1 1/4"4 - 1 1/4"
Water Capacity:140 Gallons
180 Gallons320 Gallons600 Gallons
Fan Capacity:150 CFM
150 CFM150 CFM300 CFM
Turbo Fan:60 CFM
60 CFM60 CFM60 CFM
Approximate Sq Ft:3,000
Approximate BTU'S:165,000
Insulation Roof/Walls:R30
409 Stainless Steel:YES
Domestic Coil 300,000 BTU:Optional