422.47 Water Heater Controls
- Installed to sense maximum water temperature.
- Be either a trip-free, manually reset type or a type having a replacement element. Such water heaters shall be marked to require the installation of a temperature and pressure relief valve.
Exception No. 1: Storage water heaters that are identified as being suitable for use with a supply water temperature of 82°C (180°F) or above and a capacity of 60 kW or above.
Informational Note: See ANSI Z21.22—1999/CSA 4.4-M99, Relief Valves for Hot Water Supply Systems.