Every month, join us for in-depth training and discussion on application and design for modern hydronics technology coupled with geothermal heat pumps.
Hosted by John Seigenthaler

Thermal Testing of Existing Hydronic Circuits (June, 19 • 12-1pm CDT)
Many hydronic heating circuits already in use were designed for use with boilers and higher operating temperatures than a heat pump can produce. When considering the use of hydronic heat pumps for these circuits, it’s important to know what rate of heat delivery these circuits can provide when operated at lower water temperatures. This webinar explains how the thermal performance of existing distribution circuits can be evaluated using relatively simple and affordable equipment. It explains the testing procedure and how to use the test results to estimate the circuit’s heat output rate over a range of water temperatures..
- Why thermal testing is advisable when considering retrofitting heat pumps to existing systems.
- The difference between testing the circuit’s performance and theoretically estimating its performance.
- The importance of gathering data at quasi-steady state conditions.
- How to use the test results to estimate a circuit’s rate of heat output over a range of supply water temperatures.
Upcoming Presenters

John Seigenthaler, P.E.
John has over 40 years of experience designing modern hydronic systems. He’s a hall-of-fame member of the Radiant Panel Association and has presented at hydronic and radiant heating conferences worldwide. John is the author of two textbooks: Modern Hydronic Heating, 4th Edition, and Heating with Renewable Energy.
Who Is The Modern Hydronics Webinar For?
Installers and Techs
Stay up to date on the latest equipment, design trends, and installation options. Grow profitability with the market.
Engineers
Hydronics with heat pumps make excellent renewable options with excellent efficiency. Learn about applications and design details.
Utilities & Energy Planners
Utilities are increasingly incentivizing geothermal heat pumps. We’ll address this as well as ways to decarbonize existing hydronic systems.
Anyone Interested
Hydronics aren’t just an antiquated heating technology. Learn how modern hydronics marry ultimate comfort with ultimate efficiency.
Attend Live
Thermal Testing of Existing Hydronic Circuits
Thursday June 19, 2025
12–1pm (CDT)
View Previous Webinars
Hydronic Deep Dive: Tubing Depth and Performance
May 22, 2025
10 Design & Installation Issues to Avoid
April 15, 2025
The Heat Pump That Changes Everything
March 20, 2025
Reduced Temp in Legacy Hydronics
February 20, 2025
Direct to Load Piping
January 16, 2025
Low Temperature Heat Emitters
December 12, 2024
New Air-to-Water Tech
November 14, 2024
Small-Scale Water Coolers
October 17, 2024