1703.3 Fittings — 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) § 1703.3 · Effective January 1, 2026 · Official source: Building Standards Commission

For water-based systems, fittings for ground source heat pump systems shall be approved for installation with the piping materials to be installed, and shall comply with the standards listed in Table 1703.3. Fittings for use in DX systems shall comply with Section 1715.3.

TABLE 1703.3

GROUND SOURCE LOOP PIPE FITTINGS

MATERIAL	STANDARD
Cross-linked Polyethylene (PEX)	ASTM F877, ASTM F1055, ASTM F1807, ASTM F1960, ASTM F2080, ASTM F2159, ASTM F2434, ASTM F3347, ASTM F3348, CSA B137.5, ANSI/CSA/IGSHPA C448, NSF/ANSI 358-3
High Density Polyethylene (HDPE)	ASTM D2683, ASTM D3261, ASTM F1055, CSA B137.1, ANSI/CSA/IGSHPA C448, NSF/ANSI 358-1
Polypropylene (PP)	ASTM F2389, CSA B137.11, NSF/ANSI 358-2
Polyethylene of Raised Temperature (PE-RT)	ASTM D3261, ASTM F1055, ASTM F1807, ASTM F2080, ASTM F2159, ASTM F2769, ASTM F3347, ASTM F3348, CSA B137.18, ANSI/CSA/IGSHPA C448, NSF/ANSI 358-4

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

California Mechanical Code (Title 24, Part 4)

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