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N1103.5.3 (R403.5.3) Hot Water Pipe Insulation (Prescriptive)
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Insulation for hot water piping with a thermal resistance, R-value, of not less than R-3 shall be applied to the following:
- Piping 3/4 inch (19 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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