StrawBaleFarms.com
Portage & Main Outdoor Wood Boilers

Welcome to Strawbale Farms, Inc


Strawbale Farms, Inc. is a renewable energy company that focuses on energy efficiency. With many years of experience in the renewable energy industry, we know efficiency RESULTS when we see it. It is our pleasure to offer our customers the most efficient and innovative line of Conventional Outdoor Wood Boilers, Wood Gasification Boilers and Fully Automated Woodchip Boilers made today. Known as the "Original Efficient One" since 1973, Portage & Main Boilers burn 1/3 to 1/2 less wood than any other brand of outdoor wood boiler.

It looks like 2014 will be a record sales year for the Outdoor Wood Boiler industry!

The US EPA is implementing New Source Performance Standards for Residential Wood Heaters which will effectively ban the sale of conventional outdoor wood boilers as we know them. After January 15, 2015 if you want to burn wood for heat you will be required by law to buy an EPA Phase II tested and approved wood gasification boiler. Gasification boilers are much more costly, require more maintenance and are limited to burning seasoned wood only. For more information on this regulation go to wwww2.epa.gov/residential-wood-heaters.

For those who are considering purchasing a Portage and Main Ultimizer series boiler,we strongly recommend that you place your order now to ensure delivery before this rule goes into effect. All boilers purchased before the effective date of these new regulations will be grandfathered in.

The Portage and Main Ultimizer is proven to be the most reliable, cleanest burning and most efficent conventional boiler in the industry. Because of the Ultimizers popularity, demand exceeded production in 2013 so please help us plan ahead and order your boiler now. To ensure delivery before the new regulations take effect, call us at 715-635-7811 to place your order.

Win a BL2840 or $7000.00 cash
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Portage and Main Outdoor Wood Boilers has taken the best design in the outdoor boiler industry and made it better with our revolutionary new Ultimizer BL Series. Proper combustion in an outdoor wood boiler requires heat, fuel, and oxygen. To provide the best heat, Portage and Main Outdoor Wood Boilers have incorporated the use of refractory cement and firebrick. 2-1/2 inches of stainless steel fiber reinforced pre-cast refractory cement line the bottom 12 inches of the fire chamber on all four sides. The ash removal grates at the bottom of the fire chamber are constructed of standard cast refractory firebrick four inches thick.



This is the most important major innovation in conventional outdoor wood boiler design to date. The reinforced refractory cement surrounding the fire provides;

  • Much Hotter Temperatures for Proper combustion.
  • Hotter Temperatures Allow for the Most Complete Combustion Within Any Conventional Outdoor Wood Boiler.
  • More Complete Combustion Means a Cleaner, More Efficient Burn.
  • Hotter Combustion Temperatures Eliminate Creosote, Moisture, and Their Damaging Effects.
  • Hotter Combustion Temperatures Equal A Drier Longer-Lasting Outdoor Wood Boiler.


We paired these changes with our industry leading efficient design that has been time tested through 40 years of manufacturing to come up with a boiler like no other. This is a Must See Boiler!



Please call us to schedule a visit or check our Facebook page for a listing of our show schedule.



Click on Portage and Main Outdoor Wood Boilers for online brochures and videos.




Biomass = Local, sustainable, Reliable, Inexpensive

Do you have a large heating load? Are you looking for a Biomass Boiler that is Automated-Convenient-Efficient, and Cost Effective?



Please look at our ENVIRO-500 and our ENVIRO-850, fully automated woodchip boilers.

View our newest Brochure.


Woodchips are easily accessible and inexpensive. Pound for pound, woodchips yield 40% more heat than chunk wood.



  • Dairy Farms - Heat your buildings and heat your wash water year round!
  • Greenhouses
  • Shop Buildings
  • Apartment Buildings
  • Factories
  • Poultry buildings
  • Horse Barns
  • Large Homes
  • Multiple Homes
  • Whatever your heating needs we have a boiler to suit your heating load!





Contact Strawbale Farms for a free estimate. Call 715-635-7811 or Contact Us! by email.

Click Photos to Enlarge

Strawbale House, Straw Bale Sustainable Renewable Energy Tours, educational tours of sustainable building practices and renewable solar energy and photovoltaic systems
PORTAGE & MAIN OUTDOOR WOOD BOILERS, The Efficient Outdoor Wood Furnaces
Strawbale House, Straw Bale Sustainable Renewable Energy Tours, educational tours of sustainable building practices and renewable solar energy and photovoltaic systems
PORTAGE & MAIN OUTDOOR WOOD BOILERS, The Efficient Outdoor Wood Furnaces
Strawbale House, Straw Bale Sustainable Renewable Energy Tours, educational tours of sustainable building practices and renewable solar energy and photovoltaic systems
PORTAGE & MAIN OUTDOOR WOOD BOILERS, The Efficient Outdoor Wood Furnaces
Strawbale House, Straw Bale Sustainable Renewable Energy Tours, educational tours of sustainable building practices and renewable solar energy and photovoltaic systems
PORTAGE & MAIN OUTDOOR WOOD BOILERS, The Efficient Outdoor Wood Furnaces
Strawbale House, Straw Bale Sustainable Renewable Energy Tours, educational tours of sustainable building practices and renewable solar energy and photovoltaic systems
PORTAGE & MAIN OUTDOOR WOOD BOILERS, The Efficient Outdoor Wood Furnaces
Strawbale House, Straw Bale Sustainable Renewable Energy Tours, educational tours of sustainable building practices and renewable solar energy and photovoltaic systems

Refractory Lined Firebox

PORTAGE & MAIN OUTDOOR WOOD BOILERS, The Efficient Outdoor Wood Furnaces
Strawbale House, Straw Bale Sustainable Renewable Energy Tours, educational tours of sustainable building practices and renewable solar energy and photovoltaic systems

Chip Boiler and Storage Bin on Display Trailer

PORTAGE & MAIN OUTDOOR WOOD BOILERS, The Efficient Outdoor Wood Furnaces
Strawbale House, Straw Bale Sustainable Renewable Energy Tours, educational tours of sustainable building practices and renewable solar energy and photovoltaic systems

Chip Boiler Burning Green, White Ash Chips

PORTAGE & MAIN OUTDOOR WOOD BOILERS, The Efficient Outdoor Wood Furnaces


Call us to schedule a woodchip boiler demonstration, or Click on this Facebook page link and scroll to the bottom to see the ENVIRO- 500 video.



Click on Portage and Main Outdoor Wood Boilers for online brochures and videos.


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