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

John Siegenthaler’s Latest Air-to-Water Heat Pump Design

I caught up with John Siegenthaler this week and asked him what he’s working on. His answer didn’t disappoint. Aside from teaching courses on hydronic system design, biomass heating, and air-to-water heat pumps, here are the five things John is most excited about working on this Fall:

Here are some photos and schematic of the air […]

August 18th, 2021|Categories: Biomass, Boilers, HVAC Design, Hydronic Heating, Mechanical Engineering|Tags: , |

Climate Change and COVID Crisis Boost Interest in Ventilation

The Covid-19 crisis and climate change are boosting interest in ventilation and in training that helps people calculate the amount of ventilation needed in a home or building, says HeatSpring instructor Rick Karg.

Karg, who teaches  ASHRAE 62.2 Ventilation for Single Family Dwellings, says people are increasingly interested in ventilation because it helps reduce the spread […]

David J. Goldstein Awarded Genius Grant for Multifamily HVAC Solution

Please join us in congratulating David J. Goldstein, the first Genius Grant award recipient for 2021. David is an engineer and an entrepreneur. He has self-funded the development of a new HVAC solution that has potential to make multifamily housing more affordable while increasing occupant comfort and reducing CO2 emissions.

We learned of David’s work through […]

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 […]

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 […]