The water volume in the piping shall be calculated in accordance with Section C404.5.2.1. Water heaters, circulating water systems and heat trace temperature maintenance systems shall be considered sources of heated water.
The volume from the nearest source of heated water to the termination of the fixture supply pipe shall be as follows:
- For a public lavatory faucet: not more than 2 ounces (0.06 L).
- For other plumbing fixtures or plumbing appliances; not more than 0.5 gallon (1.89 L).