Best Natural Gas Water Heaters

This compact , yet powerful unit - with gas inputs up to 140,000 BTU per hour - can meet all the hot-water needs of a small to medium American home or apartment. Designed to virtually do anything a 40-gallon tank-type water heater can do and much more The Wall mounted Excel Pro is design to work with hydronic baseboard or radiant floor heating applications, as well as provide domestic hot water to plumbing fixtures and appliances. LCD Display Control: Just set the desired water temperature The Excel Pro has an energy factor of 0.84-0.85. Excel Pro: Modulating Technology Tankless water heaters can be further divided into two categories according to their heating capability: "full on/full off" versus "modulating". Full on/full off units do not have a variable power output level; the unit is either fully on or completely off. This can cause an annoying and possibly hazardous variation of hot water temperature, as the flow of water through the heater varies. Modulated tankless water heaters change their heat output in response to the flow rate of water running through the unit. The Excel Pro comes with a display panel where you can set the output temperature and regardless of water flow the unit modulates the fire power. Pure Copper Heat Exchanger * As used by other top of the line tankless gas water heater manufacturers like Rinnai, Takagi, Rheem and Noritz. Features & Benefits Super compact 14.5" x 23" x 5.5" size 84%+ thermal efficiency 140,000 BTU maximum input 6.6 gallons/ minute capacity at 35F degree rise Minimum activation flow rate of 0.5 gpm Electronic ignition. Has a Power vented fan that Vents directly vertically or horizontally with 3" stainless steel flue 3' long flue and elbow included. Can be used in recirculation and space heating application . Delivers 6.6 gpm of hot water with a 35°F Instant Temperature Rise (Equivalent to 5.5gpm with a 45F temp Rise). European Model Digital Display is in Celsius.