1707.17 Horizontal Geothermal Piping - Materials and Methods — 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) § 1707.17 · Effective January 1, 2026 · Official source: Building Standards Commission

and Methods. Horizontal geothermal piping shall be in accordance with Section 1707.17.1 through Section 1707.18.8.

1707.17.1 Piping Material. Piping materials and joining methods for horizontal piping from the ground-heat exchanger shall be in accordance with Section 1703.2, Section 1703.3, Section 1703.4, Section 1703.5 and Section 1715.3.

1707.17.2 Dissimilar Materials. Transition fittings between dissimilar materials shall be inside or accessible.

1707.17.3 Protection of Piping. Pipes passing through walls shall be sleeved and sealed in accordance with Sec tion 316.0.

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

California Mechanical Code (Title 24, Part 4)

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