Eternal’s hybrid technology provides continuous hot water similar to its tankless counterparts, but also contains a 20-gallon reserve to support homes with high GPM requirements.  The GU125T and GU160T can pump 125 and 160 gallons per hour, respectively, providing almost double the industry average of 83GPH at half the size of a traditional 50-gallon gas water heater. This eco-friendly product exceeds Energy Star with an energy factor of 0.94, runs on a ½” gas line, and is backed by a 12-year no leak warranty on the tank and a five-year warranty on parts, according to the company.