Rinnai RUR98iN Ultra Series Condensing Indoor Natural Gas Tankless Water Heater, 9.8 Max N/A Imported Innovative technology provides an endless supply of hot water. Installation Type-Indoor, Tankless Rack System (TRS/TRW) Compatible,1/2" Gas Line Compatible Recirculation capability, with or without a dedicated recirculation line Innovative technology provides an endless supply of hot water Offers both Concentric and PVC, providing more venting options right out of the box. Flow rate @ 70(50F) Temp Rise ranges between 4.2 (5.9) and 5.5 (7.7) Rinnai's condensing technology features dual heat exchangers to provide maximum efficiency, up to .96 Energy Factor; Wifi Capable Maximum output, minimum space. About the size of a small suitcase