Porcelain-lined, steel water heaters feature an anode rod to "absorb" the electrolytical action, ensuring that your entire water heater system lasts longer. With the fastest recovery in the industry of 10.2 gallons, With the fastest recovery in the industry of 10.2 gallons, this water heater gives you hot water faster. Copolymer insulation jackets specially fit the tank to retain heat better than the "cardboard" style used on other brands. Easy to install, operate and maintain. Features 12,000 BTUs. Unit Size: 16-7/32"H x 16-7/32"W x 20-1/2"D. Cut-out size 16-7/32"H x 16-7/32"W x 20-1/2"D.