ASSE 1082-2018 covers water heaters with defined setpoint controls under various steady state flow conditions. ASSE 1082 is for water heaters that control the outlet temperature to specific limits and are installed within a hot water distribution system but not at point-of-use.

The water heater shall consist of a heat exchanger, a cold water inlet connection, a hot water outlet connection, and a means for precisely governing the outlet temperature. The water heater controller shall be listed to the appropriate electrical safety standard in accordance with the water heater category.

These devices are not intended for end use applications without point-of-use control valves, as specified by ASSE 1016 / ASME A112.1016 / CSA B125.16, ASSE 1069, ASSE 1070 / ASME A112.1070 / CSA B125.70, or other appropriate standards.