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Home » Authors » John Siegenthaler, P.E.

Articles by John Siegenthaler, P.E.

Image of square cast iron woodburner on top of granite slab with orange fire flames burning.
Hydronics Workshop | John Siegenthaler

Combining a wood-fired boiler with a hydronic distribution system

Doing wood right
John Siegenthaler, P.E.
John Siegenthaler, P.E.
March 27, 2024

I’ve written many PM columns discussing how air-to-water and geothermal water-to-water heat pumps can be combined with hydronic delivery systems to deliver efficiency AND superior comfort. This combination is a great solution for many consumers.


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3d render of a small and large fictitious air source heat pump with a piggy bank on top.
Hydronics Workshop | John Siegenthaler

Does the boiler need to change when adding a heat pump?

Is it worth it?
John Siegenthaler, P.E.
John Siegenthaler, P.E.
March 1, 2024

There is a growing interest in adding air-to-water heat pumps to existing hydronic heating systems. While I support their use, I do not recommend replacing a perfectly good cast-iron boiler that still has a long service life.


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PME March 2024 John Siegenthaler Column feature image of an electric plug being plugged in to a small wooden model house.
Renewable Heating Design | John Siegenthaler

Modern hydronics technology offers unique solutions

Solid thinking: Part 1
John Siegenthaler, P.E.
John Siegenthaler, P.E.
February 28, 2024

A problem is developing with the transition to electric heating: peak demand. Learn how air-to-water heat pumps tackle seasonal needs but struggle during extreme cold, leading to reliance on electric resistance heating.


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John Siegenthaler column: Pipes and valves illustration.
Renewable Heating Design | John Siegenthaler

The challenge of reviewing proposed system schematics

Where’s Waldo?
John Siegenthaler, P.E.
John Siegenthaler, P.E.
February 1, 2024

Discover the major flaws in a proposed heating system and learn about a makeover approach to eliminate the issues.



Read More
01 February 2024 PM John Siegenthaler column. A modern air heat pump installed in the home's boiler room, visible plastic pipes and valves
Hydronics Workshop | John Siegenthaler

Options for connecting heat pumps to existing boiler systems

Tie ins
John Siegenthaler, P.E.
John Siegenthaler, P.E.
February 1, 2024

Find out about piping options for retrofitting an air-to-water heat pump into an existing hydronic system.


Read More
PME John Siegenthaler Column. Solar panel closeup skyline background
Renewable Heating Design | John Siegenthaler

Complementary fuel sources

Progression to renewably sourced energy should not be immediate, or exclusive to fossil fuels.
John Siegenthaler, P.E.
John Siegenthaler, P.E.
January 3, 2024

Like most people, I have opinions and beliefs about our current energy sources, and specifically how they play into the future of hydronic heating and cooling technology.


Read More
PM Jan 2024 John Siegenthaler Column opening image of boiler room in basement.
Hydronics Workshop | John Siegenthaler

The ‘ins’ and ‘outs’ of thermal storage

Hydronic systems stand ready to offer performance benefits as electrification movement advances.
John Siegenthaler, P.E.
John Siegenthaler, P.E.
January 2, 2024

Hydronic-based heating and cooling systems stand ready to offer plenty of design and performance benefits. One of them is the potential for thermal storage.


Read More
01 PME John Siegenthaler column opening photo
Renewable Heating Design | John Siegenthaler

Concepts for varying flow rate in geothermal earth loops — Part 2

Max COP Tracking
John Siegenthaler, P.E.
John Siegenthaler, P.E.
November 30, 2023

System COP is a more relevant metric of geothermal heat pump performance since the owner is paying for the electrical energy to operate the heat pump and the circulator, and their operation is always simultaneous.


Read More
01 PM 1223 John Seigenthaler Column opening photo of a manifold station
Hydronics Workshop | John Siegenthaler

A simple, repeatable and scalable approach to hydronic distribution

This one works…
John Siegenthaler, P.E.
John Siegenthaler, P.E.
November 30, 2023

One of the best things about hydronic heating is there is virtually no limit to how piping systems can be customized. One of the worst things about hydronic heating is that there is virtually no limit to how piping systems can be customized.


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01 PME 1123 CLMN John Siegenthaler
Renewable Heating Design | John Siegenthaler

Concepts for varying flow rate in geothermal earth loops

Max COP Tracking — Part 1
John Siegenthaler, P.E.
John Siegenthaler, P.E.
November 2, 2023

The goal is to keep the system COP as high a possible as the operating conditions of the heat pump change. The logic behind maximum COP tracking is to continually look for an earth loop flow rate that improves the system COP.


Read More
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    • 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
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