Rinnai RUR98iP 9.8 Max GPM Ultra Series Condensing Indoor Propane Tankless Water Heater with Recirculation N/A Imported Innovative technology provides an endless supply of hot water 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 Rinnai's condensing technology features dual heat exchangers to provide maximum efficiency, up to .96 Energy Factor Maximum output, minimum space. About the size of a small suitcase