Compatible Models: Replacement thermostat fit for all water heater models. Function: When the water heater thermostat detects a higher than normal temperature, it disconnects the power to the heating element to protect the unit. High Quality: Replacement thermostat is made of high-quality materials, has chrome plating on the heating area, and uses a temperature-sensitive bimetallic strip, which makes the contacts act quickly and makes the thermostat . Note: All models have one thermostat, except the SCR-4 (for N180, for N210) and SCR-5 (for N270), which have two thermostats. Note: Before installing an electric water heater thermostat, disconnect the water heater or turn off the gas supply. Colour:As Shown Material:Bakelite + Metal Package Contents: 1 * Replacement Thermostat Fit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.