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Building Performance

Temperature Stacking in Thermal Storage for Biomass Heating Systems - Self Study

John Siegenthaler • Last updated 02/2021

4.5/5 (view ratings)
410 students
1 module
1:05 hours
6 assignments

Course description

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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Full course outline

Module 1 - 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

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


35 reviews

410 students have taken this course

by Arvin Dela Roca 06/25/2020


by William Bates 04/20/2020


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by Gajalakshmi B 02/13/2020

by Fern Portelance 11/18/2019

Nice to learn lessons from someone that uses plain language or when necessary, explains the terminology so everyone is on the same page understanding it's meaning.

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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.

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