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Home » Topics » Plumbing & Mechanical Contractor » John Siegenthaler: Hydronics Workshop

John Siegenthaler: Hydronics Workshop
John Siegenthaler: Hydronics Workshop RSS Feed RSS

Integrate a heat pump with a boiler mounted on a brick wall.
Hydronics Workshop | John Siegenthaler

How to integrate a heat pump with a boiler for dual temperature hydronic heating and cooling

Delivering expectations
John Siegenthaler, P.E.
John Siegenthaler, P.E.
July 2, 2025

A building with slab-on-grade heating from a cast iron boiler plans to expand. A monobloc air-to-water heat pump will provide heating and cooling for the new space via a fan-coil unit, with the existing boiler serving as backup.


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Heat pump of air-water technology for the home.
Hydronics Workshop | John Siegenthaler

Rethinking Heat Transfer: Why 'Natural' Isn't Always Ideal for Air-to-Water Systems

As air-to-water heat pumps replace boilers in North American hydronic systems, designers must rethink traditional approaches to heat transfer, or risk costly and inefficient installations.
John Siegenthaler, P.E.
John Siegenthaler, P.E.
June 16, 2025

Air-to-water heat pumps are gaining popularity in North American hydronic systems, but many practitioners are discovering that they operate differently from boilers.


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Underfloor heating installation with drain sewer hole in bathroom close up on water floor heating.
Hydronics Workshop | John Siegenthaler

Using hydronics to leverage time-of-use electrical rates

Buying low
John Siegenthaler, P.E.
John Siegenthaler, P.E.
May 2, 2025

As electrification reshapes the HVAC market, hydronic-based heating and cooling systems stand ready to offer many design and performance benefits. One of them is the potential for thermal storage. After all, water is one of the best materials on earth for storing sensible heat.


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Closeup of a team of industrial engineers meeting to analyze machinery blueprints and consult on a project on a table in a manufacturing factory.
Hydronics Workshop | John Siegenthaler

Build what you need: Availability and customization of heat pump systems opens doors of possibilities

John Siegenthaler, P.E.
John Siegenthaler, P.E.
April 2, 2025

The availability of heat pumps allows designers and installers of hydronic heating to include cooling. A simple method involves using a single air handler with a chilled water coil for a ducted distribution system, providing single zone cooling that can complement multi-zone hydronic heating in average houses.



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Isometric piles of scattered puzzle pieces, question marks and businessmen - stock illustration
Hydronics Workshop | John Siegenthaler

Be prepared to advocate for hydronic-based heat pump systems

Different strokes.
John Siegenthaler, P.E.
John Siegenthaler, P.E.
March 9, 2025

Most heat pumps in North America extract heat from outside air to warm interiors, which is why we call them "air-to-air" heat pumps. However, this term is incomplete, as heat pumps can also provide comfort without relying on forced air delivery.



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An air-to-water heat pump installed by Mike Bellinger and David Dousharm of CNY Pipeworx, LLC.
Hydronics Workshop | John Siegenthaler

Heat pumps open possibilities for DWH and hydronic-based cooling

Expanding a concept — part two.
John Siegenthaler, P.E.
John Siegenthaler, P.E.
February 4, 2025

Last month, we started with an air-to-water heat pump for space heating and added an auxiliary heat source and chilled water cooling. This month, we’re adding domestic water heating, similar to last month’s setup.


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HVAC Technician Installing Large Modern Heat Pump
Hydronics Workshop | John Siegenthaler

Adding functionality to heat pump systems

Expanding a concept — part one.
January 2, 2025

Standardized piping layouts for air-to-water heat pumps can improve acceptance by facilitating a basic heating system that uses a monobloc heat pump with a 30% propylene glycol solution for freeze protection.


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Laying blue pipes for floor heating at the construction site.
Hydronics Workshop | John Siegenthaler

Cutting-edge hydronics technology delivers superior efficiency and comfort

Chill chaser.
John Siegenthaler, P.E.
John Siegenthaler, P.E.
December 4, 2024

Hydronically-heated concrete floor slabs offer comfort but can be slow to warm up. A proposed solution uses a heat pump and variable-speed circulators to provide rapid heating through air handlers, ensuring quick warmth during cool days while maintaining energy efficiency.


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Heat Pump, vertical ground source, 3d illustration
Hydronics Workshop | John Siegenthaler

How to create your own flush cart for hydronic heating systems

Budget flushing
John Siegenthaler, P.E.
John Siegenthaler, P.E.
November 4, 2024

In 1986, I installed a 1.5-ton geothermal heat pump in my home using two 500-foot horizontal HDPE earth loops. After digging a trench, I connected the loops to the pump and opted for a 2 HP swimming pool pump to fill and flush the system, as a garden hose couldn't provide the needed flow rate.




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Environmentally Friendly Heat Pump Technology in Front of a brick house.
Hydronics Workshop | John Siegenthaler

The convergence of hydronics

Modern hydronic technology binds new technologies and desired outcomes together and creates unprecedented market opportunities.
John Siegenthaler, P.E.
John Siegenthaler, P.E.
October 4, 2024

In 2024, the North American air-to-water heat pump market saw significant expansion, with nine new offerings introduced at the January AHR show by companies new to this category. By year's end, at least 18 companies either have or plan to offer these pumps in the U.S. Read the list of these companies as of mid-2024.



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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
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  • INSIGHTS
    • CODES
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