12 gallon water heater from Suburban. Has a 12V DC ignition gas heating system. 120V AC heating element with 12V relay for interior operation. This water heater has been tested 2X to ensure its integrity during the manufacturing process. Uses A Porcelain-Lined, Steel Water Heater Tank With An Anode Rod To "Absorb" The Electrolytical Action - Just Like Your Water Heater At Home