Portage & Main

Ultimizer Wood Series


Smart Burning Made Easy!

Call | 866-301-4952


BL 25X34 | 28X40 | 34X44 | 40X44


The Ultimizer wood series is the product of more than 50 years of research and development that has earned Portage & Main Outdoor Boilers the reputation as an industry leader. With four sizes available, heating from under 2,000 sq ft to 12,000 sq ft, producing up to 500,000 BTUs. The Ultimizer can be connected to virtually any existing forced air or hydronic radiant heating system. Heat your home, domestic hot water, other buildings, hot tub, swimming pool, and more. In case you are looking for an EPA approved Wood Gasification Boiler we suggest you have a look at www.polarfurnace.com

Portage & Main ULTIMIZER

Portage & Main – Fireglow Process


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We pride in serving with quality & innovation since 1973. Be rest assured that we will support you end to end


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Our R&D team designed a conventional/gasifier boiler for optimal combustion with refractory firepot lining 


Easy Financing & Support

We turn smoke into usable heat . This sectional boiler design is user friendly, low maintenance & highly efficient

Unique Features & Benefits

 Introducing the ultimate solution for your outdoor heating needs

The smarter design of our boiler achieves optimal combustion using a refractory firepot lining which was the only way to prevent wood burning against the water & resulting in a cleaner and more efficient burn.

With higher temperatures, complete combustion is made possible, eliminating the damaging effects of creosote and moisture.

Not only does this provide clean burning efficiency, but it also extends the life of your outdoor boiler.

Enjoy a dryer, longer-lasting outdoor heating experience with our innovative design.

1. Refractory Lined Firebox
2-1/2″ thick refractory lining surrounds the firepot, absorbs heat from the fire. Refractory brick lined firebox allows the fire to burn extremely hot . MORE heat from LESS fuel = MORE savings & ENERGY Independence. Also serves to evaporate moisture which can cause corrosion and wet ash can be caustic

2. High Efficiency 
Exhaust gases make their 1st and 2nd pass at the TOP of the firebox. Here they MOVE UNDER and around a water cooled baffle and into the heat exchanger. These gases then travel to the FRONT of the boiler in a 3rd pass. Then they make a 180° TURN and move in a 4th pass to the BACK of the heat exchanger. All available heat is taken from the exhaust gases before they exit the chimney.

3.Quad Pass Heat Exchanger

Gases are forced through both chambers of the heat exchanger, it is completely surrounded by water for maximum heat transfer. Heat exchanger runs the full length of the furnace and exits out the back not the ceiling like some other brands. Inside the heat exchanger, there’s a part that’s cooled by water, not just a piece of steel. This keeps the whole heat exchanger surrounded by water, making it work better and increasing efficiency by up to 30% or more

4. Water Cooled Baffle
Absorbs heat as well as traps combustible gasses to create mixing and turbulence. Air is blown in from above for optimal burning of the gasses creating a hotter, more efficient burn. This trapping of gasses allows the complete burn of smoke before entering the heat exchanger

5. Water Jacket Above Brick Line
Water jacket does not surround the brick which allows the fire to burn its hottest and most efficient burn. Some model’s fireboxes are surrounded by water which prevents the hottest, most efficient burn. Portage & Main’s water jacket is above the brick line allowing the bricks to do their job – Burn hot!

6. Shaker Grates
Make cleaning easy. Just rock the grates with the shaker grate handle. Portage & Main have a proven track record in building shaker grate models before it became popular to burn coal in outdoor boilers. The shaker grates are well built, sturdy and long lasting

7. Forced Air
Air is introduced both under and over the fire. As the fire burns down to hot coals, more air is self-modulated to above the fire

8. North American Manufactured Chimney
Rear Exiting Chimney with T. North American made, any condensation stage in the chimney rather than inside the boiler. The ash accumulates in that T with a cleanout, rather than the heat exchanger. Not only saves it from corrosion but Increase the amount of heat exchange. The roof chimney cuts the heat exchange time and helps in efficient heating.


Most Trusted Outdoor Wood Boiler

since 1973

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About Portage & Main

Our head office is located in Prince Albert, Saskatchewan, Canada. Our dealer network spans North America and we would be glad to put you in touch with one of our knowledgeable agents. Our staff oversees the development of new products, monitors production, designs heating systems, and offers tech support for installers. All our wood furnaces are designed for installation outdoors and deliver wood heat indoors.







(306) 922-1722


Monday-Friday : 8am to 5pm CST

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