WAC 51-11C-40414. Section C404.14 — Demand responsive water heating

C404.14 Demand responsive water heating. Electric storage water heaters with rated water storage volume between 40 and 120 gallons and a nameplate input rating equal to or less than 12kW shall be provided with demand responsive controls that comply with ANSI/CTA-2045-B Level 2 or another equivalent approved demand responsive control . EXCEPTIONS: 1. Water heaters that provide a hot water delivery temperature of 180°F (82°C) or greater. 2. Water heaters that comply with Section IV, Part HLW or Section X of the ASME Boiler and Pressure Vessel Code. 3. Water heaters that use three-phase electric power. 4. Storage water heaters with demand responsive controls that comply with ANSI/CTA 2045-A or ANSI/CTA 2045-B Level 1, that are also capable of initiating water heating to meet the temperature setpoint in response to a demand response signal .