Dometic Atwood 91447 RV Water Heater E.C.O. High Temperature Shut-OffThe E.C.O Thermostat is a closed switch that sends voltage to the solenoid valve. The switch opens if the water temperature exceeds 180F, protecting the water heater from damage. If there is a spark present on your water heater, but no gas flow, it could be a defective E.C.O Temperature Switch.Additional InfoECO Temp. Limit180F (82C)Thermostat Temp. Limit140F (60C)Compatible withGCH6-4E, GCH6-6E, GCH6-7E, GC6A-7E, GH6-6E, GH6-7E, GH6-8E, G6A-3E, GH6-3E, GH6-4E, G6A-4E, G6A-6E, G6A-7E, G6A-8E, GCH6A-7E, GCH6A-8E, GCH6A-9E, GC6AA-7E, GC6AA-8E, GC6AA-9E, GCH10A-2E, GCH10A-3E, GC10A-2E, GC10A-3E, G610-3E, GH610-3E, G10-2E G10-3E, GC10-1E, GC10-2E, GH10-2E, GH10-3E, GCH6A-10E, GC6AA-10E, GC10A-4E, GCH10A-4E