Energy Supply

Pellet & Chip Biomass Boilers - Commercial


  • 1 size available heating up to 12,000 sq ft (500,000++ btu’s)

  • Biomass, allows for multiple fuel options

  • Automated fuel feed system

  • Adjustable heat output

  • 7yd Fuel Bin

  • Commercial/Industrial use

  • Clean burning

  • High efficient using less wood

  • Affordable heating solution

  • Multi-port double pass heat exchanger

  • Power Hydraulic operated system

  • Power Hydraulic lid lift

  • Reliable digital control system

  • Powder coated paint finish

  • 20 Year limited warranty

Innovation and Expertise to Meet Your Heating Needs

Portage & Main Boilers have been manufactured for over 40 years. We continually strive to be the leading innovators in the outdoor boiler business! Our factory is a state of the art facility that employs the latest manufacturing technology – including computer controlled robotic welders and laser cutting equipment.

The Portage & Main range of products include Ultimizer wood and coal models, auto-feed coal/pellet burners, automated wood chip burning systems and a line of EPA approved gasification boilers. 

We lead the way in innovation, quality and efficiency, using time tested and proven designs. We have developed the most efficient heat transfer exchangers available in any outdoor boiler on the market today.


B500 for Commercial/Industrial heating requirements

The B500 provides a longer burn time between fills depending on the fuel being burned and the size of structures being heated the B500 can go a week or more without refilling the 7 yard bin.

Biomass, wood chips, pellets and other available combustible materials makes this boiler a viable choice for many business operations. Wood chips, pellets and many other biomass fuels also generate a higher btu output per cubic meter than cord wood. The adjustable heat output provides the flexibility to increase the heat out put as required by weather or the addition of additional structures. ‘

Multi configuration setup provides the flexibility for virtually any location. The 4 position configuration options, allow for the fuel bin to open from the front or back and be positioned to the left or right of the boiler. Contact us for more details.

Great for large operations, multi buildings, shops, businesses, farms, greenhouses, municipal buildings, apartments, resorts, retirement homes, kilns, commercial hot water and more.



Electric Boilers



  • Heavy-duty, fully insulated heat generator (10 years warranty)

  • Pre-wired elements electronically controlled for full modulation

  • Low-watt density Incoloy elements (10 years warranty)

  • High-limit thermal protection

  • Approved for zero clearance to combustible materials

Dual-energy boilers for fossil fuel backup or standalone installations

Cozy comfort and improved efficiency while saving you money. Feel the comfort of hot water heating controlled by advanced electronics. Standard models now include great features like a modulating electronic controller with outdoor sensor as well as integrated load management control.


Modulating control with solid state relays adjusts the heat output by silently pulsing part of the boiler to keep the temperature stable. On warmer days the outdoor sensor will limit the water temperature based on the outside temperature so that your home isn’t wasting energy. The load management control works with dual energy systems where the electric utility company will control whether you heat with electricity or an alternate source such as oil or gas and offer a reduced rate as a result.

Thermolec’s electric boilers are built to last with durable, corrosion resistant stainless steel heat generator vessels. How durable? We guarantee the tank and elements for a period of 10 years. The aluminum outer shell and stainless steel tank combination makes this unit ultra-resistant to corrosion and reduces the weight for easy installation.

To see the full range of Thermolec's line of Electric Boilers we carry -