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R403.5.3 Hot Water Pipe Insulation (Prescriptive)
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Insulation for hot water pipe with a minimum thermal resistance (R-value) of R-3 shall be applied to the following:
- Piping 3/4 inch (19.1 mm) and larger in nominal diameter.
- Piping serving more than one dwelling unit.
- Piping located outside the conditioned space.
- Piping from the water heater to a distribution manifold.
- Piping located under a floor slab.
- Buried piping.
- Supply and return piping in recirculation systems other than demand recirculation systems.
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