I just bought one of these. To use with my cookie Tin Heater. I have a GFCI outlet out side. But it has a door cover on it. The thermo cube would not fit. So I've not got to use it yet. It says on that package Maximum rating: 1800 watts, 15 amps, 120V AC. Glad to hear that just the cube burnt and nothing else. That's a scary thought!