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Home » Topics » Radiant & Hydronics

Radiant & Hydronics
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Radiant Comfort Report Spring 2025 Edition

Best Practices for performance, comfort and longevity

Mastering radiant installation
William Werthman author headshot 200x200
William Werthman
July 23, 2025

As radiant heating and cooling systems continue to grow in popularity for their superior comfort, energy efficiency, and quiet operation, the importance of proper system installation cannot be overstated. A poorly installed system—no matter how advanced its components—can fall short of expectations, leading to hot and cold spots, energy waste, or costly callbacks.


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Carlos Duarte Hybrid Systems graphic
Radiant Comfort Report Spring 2025 Edition

Radiant Professionals Alliance educating the industry

Resources and new technologies to stay up-to-date on radiant & hydronics.
Hugo Aguilar P.E.
Hugo Aguilar, P.E.
July 18, 2025

The Radiant Professionals Alliance (RPA) provides superior comprehensive educational activities and innovative product awareness. This was evident at the 2025 AHR conference held in Orlando Florida. The RPA hosted eight sessions providing education to professionals and students. From the eight sessions, I would like to highlight five that deal with industry patterns, installation practices and innovative design.


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RCR Spring2025 Geothermal JHJ manifold-2
Radiant Comfort Report Spring 2025 Edition

Geothermal and radiant: An energy-efficient powerhouse

Discover how combining geothermal ground source heat pumps with radiant can provide high-performance building design with maximum efficiencies.
Kim Bliss Hailey Mick Jacob Gribbon Tim Botten
July 18, 2025

Radiant heating and cooling systems integrated with geothermal ground source heat pumps (GSHPs) offer an energy-efficient, comfortable, and sustainable approach to indoor climate control. This combined system leverages the stable temperatures of the Earth to provide heating and cooling through radiant surfaces, most commonly on floors but also on walls or ceilings.


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Piping system in the ground.
Radiant Comfort Report Spring 2025 Edition

Thermal energy networks and the future of radiant

A pathway to smarter heating systems.
Greg Cunniff author profile 200x200
Greg Cunniff P.E.
July 11, 2025

As the building industry shifts to electrification, decarbonization, and high-efficiency infrastructure, radiant heating and cooling professionals lead the change. At this year’s AHR Expo in Orlando, FL, Greg Cunniff of Egg Geo presented 'Future of BEST – Net the Energy with Community Thermal Energy Networks'.


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Modern manual laying of tuning water hydronic gas firing conduit supply on metal mesh insulation indoor new house room.
Renewable Heating Design | John Siegenthaler

Ten considerations for selling hydronic systems

John Siegenthaler, P.E.
John Siegenthaler, P.E.
July 7, 2025

While I admit to not being fully informed on the latest things from Google, Apple, Chat GPT, or social media, I’m confident that I can still pass along advice to those who are new to the hydronic industry, especially those involved with designing systems


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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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Buildup inside the iron pumps
Heating Perceptions | Scott Secor

Hidden issues and high bills: troubleshooting radiant heat in a luxury home

A seven-figure renovation leaves a high-end radiant heating system underperforming.
Scott Secor
Scott Secor
June 10, 2025

A plumber recently asked us to inspect a home with issues related to radiant heating. The homeowner, Ronny, runs a company that builds commercial office buildings, and the plumber handles the plumbing work.


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John Siegenthaler, Hot Rod Rohr and Dave Yates reunite at the Lochinvar booth at AHR 2025.
Contractor's Corner | Dave Yates

Eye candy from The AHR Expo 2025

Go with the flow
Dave Yates
Dave Yates
May 12, 2025

Eye candy would best describe many of the products on display at the great AHR Exposition recently held in Orlando Florida’s Convention Center.


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Figure 1 is a sketch of the flow problems of the current plumbing system.
The Glitch & The Fix: May 2025

Hydronic heating glitch solved: Why adding a circulator won't fix primary loop flow issue

Cut & cap
John Siegenthaler, P.E.
John Siegenthaler, P.E.
May 8, 2025

When the system was operated, the owner complained of flow problems. The heat emitters in any given zone were only marginally warmed when their associated zone circulator was operating. The owner questioned if another circulator should be installed.


Read More
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November 13, 2024

Future Proofing MEP: Navigating the 2026 High Efficiency Water Heating Standards

Join our deep dive into DOE’s new standards so you can future-proof your MEP practice.

EARN: 0.1 ASPE CEU; 1 AIA LU/HSW; 0.1 IACET CEU*; 1 PDH

August 14, 2025

Precision Under Pressure: Optimizing System Performance Through Balancing and Air Removal

We’ll cover how proper air separation and hydronic balancing help maximize operational efficiency, reduce maintenance and minimize downtime.

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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
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