High Efficiency Boiler Systems


A significant change in the North American hydronic heating industry took off and gained altitude in the mid 1990’s. Residential and light-commercial gas-fired boilers started to rapidly evolve from high-temperature, chimney-vented appliances to pressure-vented, modulating, high-efficiency condensing (mod-con) boilers.

Start Learning Right Now, For Free:
Free Course: How to Design & Sell Mod-Con Boilers with Roy Collver
Free Course: High Performance Building and HVAC 101

Air-to-Water Heat Pump & Ventilation Retrofit: A New Free Course

Here’s the story of “Finally Fossil-Fuel Free: Air-to-Water Heat Pump & Ventilation Retrofit”, a new free course presented by Brian Just from the Vermont Energy Investment Corporation. His presentation is offered in partnership with the Northeast Sustainable Energy Association.

Air-to-water heat pumps have generated a lot of excitement for their enormous retrofit potential. This case study […]

December 22nd, 2020|Categories: Boilers, Building Science Corporation, NESEA, Free Courses, Green Building, Heat Pumps, HVAC Design, Mechanical Engineering, Sustainable Building, Zero Net Energy Buildings|Tags: , |
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Fill in Your Knowledge Gaps – October HVAC Trainings

Sharpen and grow your skillset via a technical, online course about heating, ventilation, cooling and air conditioning systems:
Integrated HVAC Engineering – Master the complex interaction of room air temperature, humidity, mean radiant temperature, ventilation rate, lighting, sound, and even odors that determine the true quality of an interior environment. Go beyond LEED and ASHRAE standards with […]

September 28th, 2016|Categories: Boilers, Geothermal Heat Pumps, HVAC Design, Hydronic Heating, Solar|Tags: , , , , , , , , , , , , , , |
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Protection Considerations for Wood Gasification Boilers

Enroll in this free, 58-minute lecture and learn about the protection of wood gasification boilers.

Enroll today and learn more about the protection of boilers against low entering water temperature and against overheating during power failures.

I will discuss the dewpoint of exhaust products, how to protect wood-fired boilers against low water temperatures through thermostatic bypass valves, loading […]

April 20th, 2016|Categories: Biomass, Boilers, HVAC Design|Tags: , , , , , , , , , , |
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1 Simple Trick to Get the Most Of Your Condensing Boiler

Want to get the most from your condensing boiler? Lower the temperature.
by Roy Collver

One of the most effective energy saving technologies we have available to us right now, is the condensing boiler. Coupled with a well-designed low temperature hydronic heating system, it is easy to produce a 30% to 50% or more reduction in fuel […]

February 8th, 2016|Categories: Boilers, Hydronic Heating|Tags: , , , , , , , , , , , , , , |
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Roy Collver on Materials & Manufacturers of Condensing Boilers

On the Condensing Boilers in Hydronic Systems Discussion Board…
Expert instructor Roy Collver discusses construction materials and manufacturers of condensing boiler machines.

Student 1:
Roy, great videos and a ton of great information! Thanks a million! I have a couple of comments and questions. Stainless steel is very strong on the galvanic charts, but have you looked at the thermal […]

December 18th, 2015|Categories: Boilers, Hydronic Heating|Tags: , , , , , , , , , , , , , |
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