Atwood 94022 Combination Gas/Electric Water Heater - 10 Gallon, LP/Electric Atwood Water Heaters feature a patented 'through-tube' combustion chamber, utilizing the pilot flame to help maintain water temperature rather than losing this heat energy into the atmosphere All units are lightweight and compact, with easily accessible controls for servicing FUEL-SAVING FLEXIBILITY Atwood water heaters operate on LP gas Microprocessor technology and versatile heaters