Perspectives on Hydronics in the Real World
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In this episode of The Building Science Podcast, host Christoph and guests Robert Bean and Lance McNevin explore the overlooked potential of hydronic systems in modern building design. The conversation delves into the technical, environmental, and cultural reasons why hydronics—systems that use water or glycol mixtures to transfer heat—remain underutilized in North America despite their proven efficiency and comfort benefits. Robert and Lance highlight how hydronic systems, especially radiant heating and cooling, offer superior thermal comfort by aligning with the human body’s natural heat exchange (60% radiant), eliminate air movement and dust, and enable quieter, healthier indoor environments. They contrast this with the widespread use of forced-air systems and refrigerant-based heat pumps, which are energy-intensive, prone to leaks, and contribute to climate change due to high-GWP refrigerants. The guests emphasize hydronics’ refrigerant agnosticism, energy efficiency (with circulating pumps using only 25–40 watts vs. 300+ watts for air fans), and compatibility with renewable energy sources and district energy networks. They also discuss the cultural barriers—North America’s preference for novelty over proven solutions—and the need for systemic change across design, code, education, and trade practices to unlock hydronics’ full potential. Key takeaways include: hydronic systems enable true thermal comfort through radiant heat exchange; they are energy-efficient, low-maintenance, and compatible with renewable and district energy systems; they eliminate the need for extensive ductwork, reducing construction complexity and air leakage; they are inherently refrigerant-agnostic, sidestepping the global refrigerant transition crisis; and their adoption requires a multi-layered effort involving architects, engineers, tradespeople, and consumers. The episode closes with a powerful call to action: don’t waste energy, don’t waste resources—design with intention, efficiency, and long-term stewardship in mind.
Hydronic systems deliver superior thermal comfort by leveraging radiant heat transfer, which accounts for 60% of human heat exchange.
They are refrigerant-agnostic, eliminating risks and regulatory burdens associated with high-GWP refrigerants.
Circulating pumps in hydronic systems use 90% less energy than air fans in forced-air systems.
Hydronics enables district energy networks and thermal storage, supporting decarbonization and grid resilience.
The main barriers are cultural (preference for novelty), educational (lack of training), and systemic (fragmented trades and outdated codes).
…and 3 more takeaways available in PodZeus
Introducing Hydronics and the Guests
The episode opens with a brief introduction to hydronic systems—using water or glycol as a thermal fluid instead of refrigerant—and welcomes guests Robert Bean and Lance McNevin, both seasoned engineers with decades of experience in building systems and radiant heating. Robert is an ASHRAE Fellow and educator, while Lance is a director at the Plastics Pipe Institute with deep expertise in PEX piping and hydronic applications.
Why Hydronics? Cultural and Historical Context
“North America was founded by young pioneers who never stopped moving. That whole philosophy of building a building and then selling it and moving on has really been part of our culture.”
The Physics of Efficiency: Exergy and Second Law Thermodynamics
“Why are we generating industrial grade temperatures for non-industrial grade purposes?”
Benefits for Owners, Occupants, and Installers
“You can have 100 pipes in the space of one 14 by 8 inch ductwork.”
Hydronics in Practice: Building Typologies and System Design
Lance details how hydronic systems are easily integrated into concrete slabs, wood-frame floors, and walls using PEX tubing. The conversation covers applications in multifamily, commercial, and off-grid buildings, emphasizing cost-effectiveness and compatibility with solar and thermal storage.
“Why are we generating industrial grade temperatures for non-industrial grade purposes?”
“Don't waste stuff. Don't waste stuff.”
“You can have 100 pipes in the space of one 14 by 8 inch ductwork.”
Host
Guests
Robert Bean
person
Lance McNevin
person
ASHRAE
organization
MRT
other
PEX
product
South Korea
place
Plastics Pipe Institute
organization
COP
other
GWP
other
HeatSpring
organization
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