Thermalboard Compared to
Warmboard R

Brand Names: Warmboard R

A good product that is very expensive. Warmboard is the leading sales company in the industry that insists on denigrating virtually all competitors’ products, including our own.

Issues to Consider


Unfortunately, Warmboard feels the need to exaggerate their good performance utilizing an in-house testing methodology used by no other manufacturer in the industry. This methodology conflates fast response time with system efficiency which is simply not correct. They have good performance, just not as good as they promote. Side by side testing of many radiant systems conducted by Virginia Tech University, demonstrate that Warmboard and Thermalboard extremely close in performance.


  • Price: Warmboard R is approximately twice the price of Thermalboard per square foot.
  • Materials: Warmboard R uses composite OSB board. Thermalboard uses composite MDF board.
  • Tubing Spacing: Warmboard R uses a ½” tubing groove, 12” OC. Thermalboard uses a 3/8” tubing groove,8” OC.
  • Aluminum: Warmboard R uses .025” thick aluminum. Thermalboard uses .010 aluminum.


Warmboard R:

Performance Data. For purposes of comparison, select a given R value (resistance of radiant system and flooring goods)… lets say R-1. Follow that line down to 20 (btu/su/ft) output on the x axis and then straight down to the water temperature required to meet that load, at the bottom. The lower the temperature, the more efficient the system type.

This data is provided by the particular manufacture or from the Design Manual of Zurn Radiant, a leading manufacturer radiant tubing.

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