Bradford White offers its PowerStor Series(TM) Indirect Fired Water Heaters featuring a super-efficient heat exchanger coil. The coil's 1.5 diameter carbon steel tubing is Vitraglas® coated. A total heat surface area of 14.2 feet for residential models and 27.2 feet for commercial models contributes to the PowerStor's first hour delivery and vast hot water reserve. Models are available in 30, 40, 50, 65, 80 and 120 gallons, with commercial models in 65, 80 and 120 gallons. All feature an immersion temperature sensing control, the Hydrojet® Total Performance System, three anode rods and two inches of non-CFC foam insulation.Bradford White.