Atwood water heaters are 14 pounds lighter than competitive brands. Heaters that also operate from an electric source can run off an electrical hook up or a generator. LP/Gas heaters include a 1,400 watt electric heating element, an electric thermostat and an on-off switch. Heaters with heat exchangers transfer otherwise wasted energy from the engine-cooling system of a motorized coach to the water heater during travel. Features include a high temperature limit switch, thermostat and pressure relief valve that prevent problems before they happen. A simple flip of the switch from inside our coach lets you turn your water heater on or off. An extended cold water inlet tube enables hot water to last 55% longer. Electric ignition heaters do not include remote-mount on-off switches with indicator lights. Output 8,800 BTUs of heat. Cut-out size-6 gal.: 16 in.W x 12-1/2 in.H x 18 in.D. Durable, powder-coated access doors are included. 1 per box.