21
BTU/hr·ft²
at 133°F · basic
120
°F
Enhanced layout
for 21 BTU/hr·ft²
+
33
%
Peak output
with enhanced layout
30
Years of comfort
Innovation & reliability
Basic layout - Imperial
Performance You Can
Specify With Confidence.
Testing used ¾-inch solid oak over ¾-inch plywood in a controlled 60°F room, with steady-state heat output measurements.
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Basic layout - Metric
Performance You Can Specify With Confidence.
Testing 19 mm solid oak flooring over 19 mm plywood subflooring in a controlled 15.5°C room environment
Enhanced layout - Imperial
Designed For Air-to-Water Heat Pumps.
Increased Ultra-Fin density raises output and lowers required operating temperatures—reaching 21 BTU/hr·ft² at just 120°F.
Enhanced layout - Metric
Designed For Air-to-Water Heat Pumps.
This configuration increases heat output and enables lower operating water temperatures, making it ideal for modern air-to-water heat pumps and other low temperature heat sources.
Uniform heat distribution
Comfort Across
the Entire Floor.
Natural convective airflow inside the joist cavity distributes heat more evenly than conventional systems.
More uniform floor temperatures
Reduced hot and cold spots
Lower operating water temperatures
Optimized for boilers and heat pumps
