Bosch AquaStar Outdoor Natural Gas Tankless Water Heater #250SXO-NG Provides 6.4 gallons of hot water per minute--enough for two applications at once Outdoor, no-vent-pipe installation with freeze protection down to 5 degrees Fahrenheit Electronic ignition and computerized temperature control for comfort and energy efficiency Up to 50% cut in energy costs and greenhouse-gas emissions compared to tank units Dimensions: 26 by 15-3/4 by 8-1/2 inches; Weight: 49.5 pounds