1706.1 General — 2025 California Mechanical Code

California Mechanical Code (Title 24, Part 4) · 2025 edition · updated 2026-09-25 · 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 Mechanical Code (Title 24, Part 4) § 1706.1 · Effective January 1, 2026 · Official source: Building Standards Commission

Heat pumps shall be in compliance with Table 1706.1, as applicable. Heat pumps shall also be listed and labeled in accordance with UL 1995 or UL 60335-2-40.

Ground coupled and water source heat pumps shall be listed in accordance with AHRI/ASHRAE/ISO 13256-1 for water-to air heat pumps and AHRI/ASHRAE/ISO 13256-2 for water-towater heat pumps. DX heat pumps shall be listed in accordance with ASHRAE 194. All heat pump equipment used in DX systems shall comply with AHRI 870. Heat pumps shall be fitted with a means to indicate that the compressor is locked out.

TABLE 1706.1

HEAT PUMPS

TYPE OF HEAT PUMP	STANDARDS
Water-to-Air	AHRI/ASHRAE/ISO 13256-1
Water-to-Water	AHRI/ASHRAE/ISO 13256-2

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▸Contents — California Mechanical Code (Title 24, Part 4)

California Mechanical Code (Title 24, Part 4)

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