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Hot Water Delivery (3.3)
Install an efficient hot water delivery system that meets the requirements of the WaterSense® New Homes Program to store no more than 0.5 gallons (1.9 liters) of water in any piping/manifold between the hot water source and any hot water fixture. Efficiently designed hot water delivery systems reduce the amount of time it takes hot water to reach a fixture, saving both water and energy.
The hot water source refers to the container in which water is stored and/or heated, such as a hot water heater or a demand-controlled recirculation loop.
During inspector verification, to account for the additional water that must be removed from the system before hot water can be delivered, no more than 0.6 gallons (2.3 liters) of water shall be collected from the hot water fixture before hot water is delivered. Recirculation systems must be demand-initiated. Systems that are activated based solely on a timer and/or temperature sensor do not meet this requirement.
See the following Solution Center guides for further information: