Features a remote switch that electronically controls the water heater from inside the coach. Porcelain-lined, steel water heaters feature an anode rod to "absorb" the electrolytic action, ensuring that your water heater lasts longer. With the fastest recovery in the industry of 7.6 gallons, this water heater gives you hot water faster. Copolymer insulation jackets specially fit the tank to retain heat. Easy to install, operate and maintain. Four gallon features 9,000 BTUs and is 12-11/16"H x 12-11/16"W x 16-1/8"D. Cutout: 12-3/4"H x 12-3/4"W. Access door sold separately.