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Home » Topics » Columnists » John Siegenthaler: Hydronics Workshop

John Siegenthaler: Hydronics Workshop
John Siegenthaler: Hydronics Workshop RSS FeedSubscribe

John Siegenthaler gives a technical view of hydronic and radiant heating systems.

ARTICLES

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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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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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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manifold systems

John Siegenthaler: Extended manifold systems

Less tubing, less drilling, less fastening.
John Siegenthaler, P.E.
John Siegenthaler, P.E.
June 1, 2023

Several years ago, I had the opportunity of visiting the Mostra Convegno Expocomfort show in Milan, Italy. It ranks right up there with the famous ISH show in Frankfurt, Germany, as a “bucket list” event for those who are passionate about hydronic heating and plumbing.


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Variable-speed heat pump

John Siegenthaler: Eyes for a heat pump — part two

Variable-speed heat pumps allow a better match between the rate of heat production and the rate of heat dissipation by the load.
John Siegenthaler, P.E.
John Siegenthaler, P.E.
May 1, 2023

Last month, we discussed the role of buffer tanks in combination with air-to-water and water-to-water heat pumps that operate as “on/off” devices. The key concept was to turn the heat pump on and off based on changes in the buffer tank temperatures and not based on thermostats calling for heat.


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hydronic heating and cooling systems

John Siegenthaler: Eyes for a heat pump

Buffer tanks are necessary for heavily zoned distribution systems.
John Siegenthaler, P.E.
John Siegenthaler, P.E.
March 31, 2023

More and more hydronic heating and cooling systems are being designed around air-to-water and water-to-water (geothermal) heat pumps. When the heating distribution system is extensively zoned, a buffer tank is typically installed between the heat pump and that distribution system.


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ductless mini-split heat pump system

John Siegenthaler: Air-to-water heat pumps offer more than ductless

Little white boxes
John Siegenthaler, P.E.
John Siegenthaler, P.E.
March 1, 2023

Government planners, taking their queues from politicians and advocacy organizations, have steered the future of energy supply away from fossil fuels and toward renewably-sourced electricity. It’s happening on every level from the feds right down to local city councils.


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hydronic heating system

John Siegenthaler: Adding a heat pump

Several possible approaches.
John Siegenthaler, P.E.
John Siegenthaler, P.E.
January 31, 2023

Many legacy hydronic heating systems use a fossil fuel boiler to supply fin-tube baseboard heat emitters in some areas of a building and lower-temperature radiant panels in other areas. 


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hydronic systems

John Siegenthaler: Well-planned hydronic systems last far longer than modern appliances

Lasting value
John Siegenthaler, P.E.
John Siegenthaler, P.E.
January 3, 2023

Although I’ve worked with hydronic heating for four decades and designed systems around just about every possible heat source, I would be hard-pressed to predict what might be available as hydronic heat sources 25 years from now. 


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Geothermal pipe passages

John Siegenthaler: Geothermal pipe passages

Bringing earth loop piping through poured concrete.
John Siegenthaler, P.E.
John Siegenthaler, P.E.
November 30, 2022

Water-to-water heat pumps, supplied from geothermal earth loops, represent a growing sector of the hydronic heat source market. Most current-generation models can produce water temperatures up to about 125° F, perhaps a little higher if you’re willing to push the compressor operating envelope.


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