Tag Archives: Hot water tank

Residential Code requirement for expansion tank

The 2012 International Residential Code (P2903.4.2) requires the installation of an expansion tank on a hot water tank where thermal expansion may cause an increase in pressure. The tank is only required when the water supply system incorporates a backflow … Continue reading

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Residential Code requirement for TPR discharge drain

  The 2012 International Residential Code (P2803.6.1) provides thirteen requirements for the water heater TPR discharge pipe. 1. Cannot be directly connected to the drainage system 2. Must discharge through an air gap 3. Must not be smaller than the … Continue reading

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