Name Supreme on Demand ., BTU Natural Gas Tankless Water Heater GPM Ultra Low NOx Natural Gas Condensing High Efficiency Tankless Water Heater.A.O. Smith GCR ProMax Plus High Efficiency Gas Water Heater, gal.A.O. Smith ENT ProMax High Efficiency Tall Electric Water Heater, gal.Learn how to troubleshoot and repair a tank type electric water heater in your home, including common problems of lack of water and leaks..
In a conventional gas storage water heater, less than of the fuel energy reaches the point of use. New efficient water heaters can help reduce this excess heat loss. The minimum efficiency of electric resistance storage water heaters is about . depending on tank volume , and the best available are . EF..