This Rheem Gas Control (Thermostat) - NG is a vital component designed for natural gas water heaters. It functions as a regulator to control the flow of gas into the water heater, ensuring optimal performance and safety. The device is equipped with a thermostat that monitors and maintains the desired temperature within the water heater by adjusting the amount of gas supplied. This Rheem product is compatible with specific models of Rheem, Ruud, Richmond, GE and Hotpoint natural gas water heaters. It features an energy cut-off (ECO) system for enhanced safety, which automatically shuts off the gas supply if it detects unusually high temperatures. The product also includes an integrated Piezo igniter for easy pilot lighting without matches or lighters.