Condensing Natural Gas Tankless Water Heater, 199,000 BTU, Indoor, Ultra Low Nox Emissions, Primary Heat Exchanger Is Constructed Of HRS35 Commercial Grade Copper Secondary Type 316L Stainless Steel Heat Exchanger, Built In Temp Controller Diagnostics, Supplied With A Power Cord Remote Control, Easy Link Up To 4 Units, Multi Link Up To 20 Units, Water Connection Location Is At The Bottom Of The Tank Water Connection Size Is 34, UEF 093 EF 0,95,Vent Type PVC, CPVC, PP, ABS, SS Vent Size 3 Or 4, Unit Dimensions 25 58H x 12 12D, Energy Star Qualified, On Heat Exchanger