1204.7 Heat Transfer Fluid — 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) § 1204.7 · Effective January 1, 2026 · Official source: Building Standards Commission
Hydronic piping shall be identified with an orange background with black uppercase lettering, with the words “CAUTION: HEAT TRANSFER FLUID, DO NOT DRINK.” Each hydronic system shall be identified to designate the fluid being conveyed. The minimum size of the letters and length of the color field shall comply with Table 1204.3.
Each outlet on the hydronic piping system shall be posted with black uppercase lettering as follows:
“CAUTION: HEAT TRANSFER FLUID, DO NOT DRINK.”
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