Enjoy unlimited hot water with Rinnai's Sensei Super High-Efficiency Plus (0.98 UEF) condensing tankless water heater. Only the size of a small suitcase, this compact model can be easily converted to use either Natural Gas or Propane with no additional purchase necessary. Perfect for any location, this model allows for either indoor installation or outdoor installation with the purchase of the Versa Vent adaptor (sold separately). The Smart Connect™ feature allows pros to connect their smartphone or tablet to the water heater via Bluetooth® to set up and register the product using the Rinnai Central App for you to receive an additional four years of labor coverage on your warranty.