1GWH6550 is a part number for a Girard Products water heater thermostat switch, specifically the 1GWH6550 ECO 55C model. It's used in RVs and is designed to replace older thermostats, offering a better shower experience. The "ECO 55C" designation likely refers to an eco-friendly feature and a maximum temperature setting of 55 degrees Celsius (131 degrees Fahrenheit), according to online retailers
Superseded from Girard Products 42-0018 (NTP) Water Heater Thermostat Switch; For Girard Tankless Water Heater; Limit Switch; 55 Degree Celsius