About this course

This free lecture describes a unique method of managing the operation of biomass-fueled, as well as auxiliary, boilers for optimum system performance. It begins with an explanation of why thermal storage is critically important in many systems using biomass boilers. It goes on to describe how temperature stacking is accomplished using multiple temperature sensors mounted in different vertical locations within a thermal storage tank and off-the-shelf controllers. It explains how to use the temperature stacking technique in systems using multiple biomass boilers as well as systems that combine a biomass boiler with an auxiliary boiler.

The lecture covers:

  • The need for proper thermal storage in systems using wood-fired heat sources
  • The rationale for temperature stacking within thermal storage tanks
  • How to configure standard controls to manage temperature stacking
  • How temperature stacking differs when using an auxiliary boiler

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Course outline

1 module • 6 assignments • 1:05 hours of video lectures

Module 1 • 3 assignments
Temperature Stacking in Thermal Storage for Biomass Heating Systems

In this one-hour lecture, Joseph Seymour gives a brief introduction to the Biomass Thermal Energy Council (BTEC) and John Siegenthaler gives a detailed explanation of temperature stacking in thermal storage for biomass heating systems.

  • Presentation slides (.pdf)
  • Temperature Stacking in Thermal Storage for Biomass Heating Systems (1 hour) (01:05:43 hours)
  • Temperature Stacking in Thermal Storage for Biomass Heating Systems (Audio) (.mp3)


  • John Siegenthaler

    P.E., Appropriate Designs
    View profile

    John Siegenthaler, P.E., is a mechanical engineering graduate of Rensselaer Polytechnic Institute, a licensed professional engineer, and Professor Emeritus of Engineering Technology at Mohawk Valley Community College. “Siggy” has over 40 years of experience in designing modern hydronic systems. He is a hall-of-fame member of the Radiant Panel Association, and a... Learn more

Frequently asked questions

How does this course work?
This is a free course. Enroll today and get access to all of the materials instantly. The lecture video and other materials are available any time.
How long do I have access to the materials?
For free courses there is no guarantee for how long the course materials will be available.
Is there a certificate of completion?
Certificates of completion are only provided to HeatSpring Membership subscribers. This course has not been approved by any credentialing organizations (NABCEP, AIA, USGBC etc) for Continuing Education Credits (CEUs). This course is for self education purposes only and completion does not indicate a level of professional expertise or credential.
Can I register multiple people?
Yes, this is a free course so you can share this page with other people from your group.


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