1217.2 Radiant Under-Floor Heating — 2025 California Mechanical Code
California Mechanical Code (Title 24, Part 4) · 2025 edition · updated 2026-09-25 · California
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Italicized text is a California amendment to the model code, as printed in the official publication.
Cite as: 2025 California Mechanical Code (Title 24, Part 4) § 1217.2 · Effective January 1, 2026 · Official source: Building Standards Commission
Floor finished surface temperatures shall not exceed the following temperatures for space heating applications:
(1) 85°F (29°C) in general occupied applications.
(2) 90°F (32°C) in bathrooms, foyers, distribution areas such as hallways and indoor swimming pools.
(3) 88°F (31°C) in industrial spaces.
(4) 95°F (35°C) in radiant panel perimeter areas, i.e., up to 2.5 feet (762 mm) from outside walls.
The radiant heating system temperature shall not exceed the maximum temperature rating of the materials used in its construction.
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