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Home » Topics » Radiant & Hydronics

Radiant & Hydronics
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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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A young boy uses a measuring tape and pretends to be a construction worker. He is wearing a hard hat, suspenders, and a tool belt while measuring on a stud of a house being built in Utah, USA.
Heating Perceptions | Scott Secor

Young people do want to work

Don’t judge everyone based on stereotypes.
Scott Secor
Scott Secor
February 3, 2025

An emergency call led a team to a school with a leaking boiler, which was shut down due to safety concerns. After clarifying the need for urgent repairs, the executive director approved the work. Complications arose from snow and transport challenges, but a friend connected them with a group of young workers willing to help, easing manpower concerns.


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January 2025 The Glitch & The Fix: Figure 1 diagram.
The Glitch & The Fix: Januar 2025

A hydro-split air-to-water heat pump system that ‘sorta’ works

January 27, 2025

Occupants of a building using a hydro-split air-to-water heat pump are facing slow recovery after night setbacks and inadequate hot water during peak demand. The system, composed of an outdoor and indoor unit, struggles with heating efficiency. What improvements could enhance its performance?


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Small Aux Boiler
Heating Perceptions | Scott Secor

Low-pressure steam boiler piping gets much-needed replacement

71-year-old piping failure at an apartment complex resulted in many challenges.
Scott Secor
Scott Secor
January 8, 2025

We tackled issues at a 1953 apartment complex with a failing steam system, repairing pumps and leaks. This year, we discovered significant deterioration in the 6-inch steel steam main while preparing for its replacement, highlighting the poor condition of the aging infrastructure.


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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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Grundfos residential pump installation.
Radiant Comfort Report Winter 2024 Edition

Redefining the circulator pump industry through efficiency improvements

DOE minimum efficiency standard set to take effect in 2028.
Nicole Krawcke head shot 2024
Nicole Krawcke
December 24, 2024

Advancements in the plumbing industry are driven by U.S. Department of Energy regulations, with new efficiency standards for fractional horsepower pumps set for 2028. Plumbing & Mechanical's Nicole Krawcke discussed these changes and performance improvements with Becky Henderson from Grundfos Pumps.


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Edward Little High School cafeteria showing a row of lunch tables and a set of sitting stairs going up to an upper level.
Radiant Comfort Report Winter 2024 Edition

193 radiant heating zones deliver efficient comfort for new school

Expert design services boost project success.
Timothy Lovell.jpg
Timothy Lovell
December 24, 2024

Edward Little High School in Auburn, Maine, utilizes an efficient radiant floor heating system designed by Harriman Associates, using lower temperature water and primarily geothermal energy for a comfortable, sun-like warmth.


Read More
Figure 2
The Glitch & The Fix

How would you fix this oil-fired boiler system?

December 23, 2024

The first photo shows an oil-fired boiler and surrounding details. Take a close look, and make a list of what you would change in this portion of the system.


Read More
Illustration of Thermal Energy Networks (TENs)
Radiant Comfort Report Winter 2024 Edition

A new generation of Thermal Energy Networks

TEN allows for both cooling or warming to be applied to decarbonization efforts.
Rick Bostian
Rick Bostian
December 18, 2024

The 2024 Uniform Mechanical Code's Chapter 17 introduces Thermal Energy Networks (TEN), enabling buildings to independently manage heating and cooling sustainably, reducing environmental impact and enhancing energy efficiency across communities.


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ProRadiant Mixing Block Grp2001

Follow the PIM method for a perfect radiant installation everytime

A guide to installation success.
Fae Champagne-Walls
December 17, 2024

Use the PIM Method (Preparation, Installation, Maintenance) for effective radiant heating installations, emphasizing clear project intent, proper manifold placement, and regular fluid maintenance to ensure efficiency.


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

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  • NEWS
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    • BUSINESS MANAGEMENT
    • HIGH EFFICIENCY HOMES
    • TECHNOLOGY
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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
      • Codes Corner
      • Natalie Forster: Editorial Opinion
      • Guest Editorial
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  • EMAGAZINE
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