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Home » Authors » John Siegenthaler, P.E.

Articles by John Siegenthaler, P.E.

01 PM 1123 CLMN John Siegenthaler
Hydronics Workshop | John Siegenthaler

What’s possible with hydronics and heat pumps?

Combined elements — part two
John Siegenthaler, P.E.
John Siegenthaler, P.E.
November 1, 2023

Last month, we began discussing the HVAC system installed at my church’s newly-constructed parsonage. In this month’s column, we’ll complete the picture.


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01 PM CLMN John-Siegenthaler
Hydronics Workshop | John Siegenthaler

Creating a complete system to provide space heating, cooling, DHW and fresh air ventilation

Combined elements
John Siegenthaler, P.E.
John Siegenthaler, P.E.
October 2, 2023

The overall objective was to create a complete HVAC system, rather than just a heating + cooling system. The system would provide space heating, cooling, domestic hot water, and fresh air ventilation.


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01 PME 1023 CLMN John Siegenthaler feature image
Renewable Heating Design | John Siegenthaler

Products that would be welcome additions to the North American hydronics market

Five propositions
John Siegenthaler, P.E.
John Siegenthaler, P.E.
September 29, 2023

Every year, manufacturers develop new or improved products for the North American hydronic market. Product development planning by those manufacturers depends on several factors. Here are a few of the main considerations.


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01 PME 0923 CLMN John Siegenthaler
Renewable Heating Design | John Siegenthaler

Details for piping multiple hydronic heat pumps

Expanded possibilities
John Siegenthaler, P.E.
John Siegenthaler, P.E.
August 31, 2023

Multiple boiler systems have been used for decades. They allow full heating capacity to be delivered when necessary, while also retaining high efficiency under partial load conditions compared to a single large boiler.


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01 PM 0923 CLMN John Siegenthaler
Hydronics Workshop | John Siegenthaler

There are still viable applications for solar thermal technology

Sōl Survivor
John Siegenthaler, P.E.
John Siegenthaler, P.E.
August 31, 2023

Although the market for solar thermal systems is a tiny fraction of what it once was, I still believe there are viable applications that could help in decarbonizing thermal energy systems.


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PME 0823 John Siegenthaler CLMN feature
Renewable Heating Design | John Siegenthaler

Using “reverser valves” to switch buffer tanks between heating and cooling

Tank flipping
John Siegenthaler, P.E.
John Siegenthaler, P.E.
August 1, 2023

When a fixed output heat pump supplies a highly zoned heating or cooling distribution system, a buffer tank is typically used to prevent the heat pump from short-cycling under very low load conditions.   


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01 PM 0823 CLM John Siegenthaler feature
Hydronics Workshop | John Siegenthaler

Relays and switches — part two

Building the brains for custom hydronics systems.
John Siegenthaler, P.E.
John Siegenthaler, P.E.
August 1, 2023

Last month, we covered the basics of classifying switches and relays based on poles and throws. Once you learn these, it’s easy to apply switches and relays to create “hard-wired” control logic - part two.


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PME 0723 Jim Siegenthaler Main
Column | John Siegenthaler

John Siegenthaler: Understanding thermal equilibrium and hydraulic equilibrium

Hydronic certainties
John Siegenthaler, P.E.
John Siegenthaler, P.E.
July 3, 2023

ades of dealing with hydronic systems, I’ve confirmed two characteristics that always govern their operation. Both are rooted in the tenants of thermodynamics. Neither should be thought of as mysterious. 


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01 0723 Column John Siegenthaler main image
Column | John Siegenthaler

John Siegenthaler: Relays and switches — part one

The basics.
John Siegenthaler, P.E.
John Siegenthaler, P.E.
July 3, 2023

The basics of relays and switches - part one.


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hydronic heating and cooling

John Siegenthaler: Performance metrics for modern hydronic heating and cooling sources

Abundant acronyms
John Siegenthaler, P.E.
John Siegenthaler, P.E.
June 1, 2023

Those who evaluate the performance of HVAC source equipment such as boilers, furnaces and heat pumps have to work with a wide variety of acronyms. Some of them were spawned by government bureaucrats, mostly the U.S. Department of Energy (DOE). Others were created through a consensus process based on input from manufacturers and other industry stakeholders.


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    • WATER TREATMENT
    • PMC COLUMNS
      • Dave Yates: Contractor’s Corner
      • John Siegenthaler: Hydronics Workshop
      • Kenny Chapman: The Blue Collar Coach
      • Matt Michel: Service Plumbing Pros
      • Scott Secor: Heating Perceptions
  • ENGINEERS
    • CONTINUING EDUCATION
    • DECARBONIZATION | ELECTRIFICATION
    • FIRE PROTECTION
    • GEOTHERMAL | SOLAR THERMAL
    • PIPING | PLUMBING | PVF
    • PME COLUMNS
      • Christoph Lohr: Strategic Plumbing Insights
      • David Dexter: Plumbing Talking Points
      • James Dipping: Engineer Viewpoints
      • John Seigenthaler: Renewable Heating Design
      • Lowell Manalo: Plumbing Essentials
      • Misty Guard: Guard on Compliance
  • RADIANT & HYDRONICS
    • RADIANT COMFORT REPORT
    • THE GLITCH & THE FIX
  • INSIGHTS
    • CODES
    • GREEN PLUMBING & MECHANICAL
    • PROJECT PROFILES
    • COLUMNS
      • Codes Corner
      • Natalie Forster: Editorial Opinion
      • Guest Editorial
    • SPONSOR INSIGHTS
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