Chapter 4 — PLUMBING FIXTURES AND FIXTURE FITTINGS
409.4 Limitation of Hot Water Temperature in Bathtubs and Whirlpool Bathtubs — 2025 California Plumbing Code
California Plumbing Code (Title 24, Part 5) · 2025 edition · updated 2026-10-19 · California
CBSC: official editions, supplements and errata
Italicized text is a California amendment to the model code, as printed in the official publication.
Cite as: 2025 California Plumbing Code (Title 24, Part 5) § 409.4 · Effective January 1, 2026 · Official source: Building Standards Commission
409.4 Limitation of Hot Water Temperature in Bath- tubs and Whirlpool Bathtubs. The maximum hot water temperature discharging from the bathtub and whirlpool bathtub filler shall be limited to 120°F (49°C). The maximum temperature shall be regulated by one of the following means:
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(1) A limiting device conforming to either ASSE 1070/ASME A112.1070/CSA B125.70 or CSA B125.3.
(2) A water heater conforming to ASSE 1084.
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