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Home » Authors » Cody Mack
Cody Mack

Cody Mack

Cody Mack has nearly 20 years’ experience as an installation contractor, service technician, application engineer and, most recently, as training manager for Caleffi North America. He’s a family man, gear-head, and motorcycle enthusiast with a common-sense approach to hydronics. Cody can be reached at [email protected].

Articles

ARTICLES

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Radiant Insider

Understanding Pressures in Hydronic Heating Systems

Why 12 psi isn’t always the answer.
December 1, 2025
Cody Mack

Learn why “12 psi” isn’t a one-size-fits-all rule as this deep dive into hydronic heating pressures shows how system height, air control, and proper fill settings can make or break performance, efficiency, and reliability.


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Radiant Insider

Things to Avoid When Designing Hydronic Systems

Doing it right the first time is a lot easier!
September 1, 2025
Cody Mack

Cody Mack shares essential hydronics lessons to avoid costly mistakes, covering glycol use, proper system velocity, mixing valve piping, and water quality for reliable, efficient heating systems.


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Radiant Insider

Understanding Hydraulic Separation

Why you need it, the benefits and the unintended consequences.
April 3, 2025
Cody Mack

Hydraulic separation is a crucial concept in hydronic systems, allowing multiple circulators to operate independently without conflict.


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Radiant Insider

Boiler Install Best Practices

Tips and tricks to make your installations go smoothly and prevent callbacks.
December 2, 2024
Cody Mack

Caleffi’s Cody Mack provides some installation tips dealing with hydronic system pressure, using an expansion tank, helping air separators work and in-floor radiant heat.


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Radiant Insider

DHW, Mixing Valves and Recirculation

How recirculation can make or break your domestic hot water system.
September 2, 2024
Cody Mack
Caleffi’s Cody Mack receives many calls about recirc creep. In this column, he emphasizes the importance of proper piping, balancing and selecting appropriate mixing valves to prevent it and maintain water temperature control.


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Radiant Insider

Hydronics, DHW and Mixing Valves

Taking some of the mystery out of mixing valves.
June 3, 2024
Cody Mack
Cody Mack provides information on the importance of three-way mixing valves, where you need them, how to size them, and the role of recirculation systems in maintaining stable temperatures in hydronic systems.


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Radiant Insider

Let’s Get Serious About Air Separation

Tips, tricks and ideas for hydronic technicians and designers.
December 4, 2023
Cody Mack

As hydronic designers and technicians, our priorities are increasing customer comfort and system efficiency — and air elimination should be at the top of our lists. If we implement best practices, our customers will have trouble-free and efficient hydronic systems.


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Radiant Insider

Zoning and Balancing Residential Hydronic Systems

Making people comfortable while spending less.
September 4, 2023
Cody Mack

Providing heat, comfort, and energy efficiency can be achieved if we rethink the micro-zoning of the past and open our minds to balancing flow rates. Cody Mack explains why balancing should be part of every hydronic contractor’s skill set.


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Radiant Insider

Hydronic Blunders and Educational Opportunities

Just because it works doesn’t mean it’s right.
July 5, 2023
Cody Mack

Remember that you can learn from others’ mistakes when on a service job. The hydronic system may work as installed, but that doesn’t mean it is installed correctly. Read on to learn about three instances where the author learned valuable lessons about hydronics — and working with customers.


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Radiant Insider

Change Equals Opportunity

The heat pumps are coming! The heat pumps are coming!
March 7, 2023
Cody Mack
The transition to electrification, heat pumps and alternative energy will likely be a bit rough as technology and installation practices catch up with the industry’s best intentions.


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