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