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    Meet the Pristine Gasification Series,
    the Next Generation of
    outdoor wood furnaces pristine 7400e
  • golden fall aspen forest
    The Original Round Designed Outdoor Furnace Made From 409 Stainless Steel
    outdoor furnaces rs7300


Pushing the Limits of What is Possible

Energy efficient, using readily available, renewable resources, makes Crown Royal Stoves, Outdoor Wood Furnaces, the number one choice for many consumers. Also known as outdoor boilers, stoves, or hydronic heaters, our units are one of the least expensive ways to heat in the winter months.


Depending on the furnace model you choose, you’ll be able to burn wood, coal, corn, wood chips, wood pellets, & more. Our indoor / outdoor furnaces are non pressurized systems, designed to be located virtually next to your fuel storage, keeping the mess outside. For the best corrosion resistance and heat transfer possible, all of our boiler’s fireboxes and outer drums are constructed from Domestic 409 Titanium Enhanced Stainless Steel.


Each indoor / outdoor furnace has been designed, and throughly tested, through years of research & development, to consume 30%-50% less fuel than the competition. Almost any existing heating system on the market can be converted to heat with Crown Royal Stoves, Outdoor Wood Furnaces. Heating applications include Residential Homes, Pool / Hot Tubs, Domestic Hot Water, Radiant In-Floor Heating, Commercial Buildings, Greenhouses, Garages & Workshops, Barns & Agricultural Buildings.

smiling little girl with golden retriever laying on rug

Cleaner, Safer Outdoor Furnaces for Your Home

Take it from us, We Know How to Heat!

Provide your family with the increased convenience and safety that come with an outdoor wood furnace. Along with enjoying outstanding energy efficiency and lower heating costs, Crown Royal Stoves indoor / outdoor furnaces will allow you to benefit from:

  • no mess or odor in the house from heating fuels
  • no carbon monoxide caused by natural gas
  • no fire hazard from an indoor furnace / boiler system
outdoor wood furnaces and wood pile

Modern Outdoor Wood Furnace

Rigidly Tested for Efficiency & Reliability

Located in International Falls, Minnesota, “The Icebox of the Nation”, where temperatures plummet below -40° during the winter months, Crown Royal Stoves outdoor wood furnaces are built at Greentech Manufacturing Inc. and have been rigidly tested to push the limits of what is possible. This allows us to produce the most efficient & reliable indoor / outdoor furnaces on the market, backed by our industry leading 20 Year Limited Warranty.



Providing an Environmentally Responsible Alternative

We know that protecting the environment to safeguard and create a healthier planet for your family’s future is important to you. It’s important to us too.

That's why Crown Royal Stoves, Outdoor Wood Furnaces, Pristine Gasification Series, has been designed to achieve the highest efficiency ratings possible, dramatically reduce emissions with the aid of an advanced air delivery system, reducing your carbon footprint and exceeding EPA standards.

A number of our outdoor furnace models are multi-fuel enabled, designed to burn a variety of renewable resources, that are readily available, allowing you to heat in a sustainable, energy efficient manner.


The Superior Choice for Indoor / Outdoor Wood Furnaces

Not all 409 Stainless Steel is created equal. Imported stainless steel has lower quality control standards causing a variety of problems in outdoor wood furnaces. The firebox and water jacket are the most important design features of any boiler system which is why all Crown Royal Stoves are manufactured with Domestic 409 Titanium Enhanced Stainless Steel. Our Domestic 409 Stainless Steel is 100% produced in USA Mills, ensuring premium quality.



Experience the Crown Royal Difference

  • 409 Titanium Enhanced Stainless Steel
  • Triple Pass Water Filled Heat Exchanger *
  • Secondary Combustion*
  • Stainless Steel Heat Transfer Tubes
  • Stainless Steel Turbulators*
  • Easy Heat Exchanger Cleaning*
  • Fan Forced Draft
  • Smoke By-Pass *
  • Class A Insulated Chimney
  • 20 Year Limited Warranty
  • Roller Latch Door System*
  • Non-Stick Door Gasket
  • Insulated - Walls R30, Roof R30
  • Shaker Grate System with Removable Ash Pan *
  • Firebrick Refractory *
  • Ash Clean Out Doors
  • Easy to Read Backlit Display
  • Water Level Indicator
  • No Mess in the House
  • Works with Any Existing System
  • No Carbon Monoxide Caused by Gas Fumes
  • 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
  • Manufactured with Domestic Stainless Steel

* available on select indoor / outdoor furnace models only

usa made



Pushing the Limits of What is Possible

At Greentech Manufacturing we work hard to deliver the highest quality, longest lasting, easiest to maintain and operate outdoor wood furnaces on the market. Each indoor / outdoor boiler is manufactured here in the USA and is developed through a rigorous research & development program, along with extensive testing, then backed by our industry leading 20 Year Limited Warranty.