The Residential Floor Gas Hybrid Water Heater is a revolutionary product that was designed to be the most highly efficient affordable residential tank type product in the industry. The Gas Hybrid Water Heater is made with an advanced stainless steel integrated fire tube heat exchanger for superior performance. The WGRGHNG100F model has up to a 95% thermal efficiency rating while the WGRGHNG75F model has a .83 Energy Factor and a .88 Uniform Energy Factor. The Gas Hybrid Water Heater can be used in several applications, such as space heating, recirculation, solar water heating and geothermal applications. It vents up to 50’ in 2” pipe or up to 100’ in 3” pipe. This revolutionary product provides more hot water than a standard water heater with a small footprint. The WGRGHNG75Fand 100F have half the storage and twice the Btuh which results in a recovery rate that is 4 times faster than traditional storage units.