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Where a solar thermal system directly heats potable water for a potable water distribution system, the pipe, fittings, valves and other components that are in contact with the potable water in the system shall comply with the requirements of Chapter 29.
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608.9 Water Supply and Distribution, Identification of Nonpotable Water Systems
Where nonpotable water systems are installed, the piping conveying the nonpotable water shall be identified either by color marking, metal tags ...