The SENSEI™ RX199iN condensing tankless water heater from Rinnai is only the size of a small suitcase, uses either Natural Gas or Propane, and can be installed indoors or outdoors using the Versa-Vent™ accessory. Rinnai SENSEI RX Series tankless water heaters last up to twice as long as tanks and have twice the warranty length. Plus, they save energy by heating water only when it is needed. Features: Flow rate of 0.26 - 11.1 GPM Available temperature settings range from 98 to 140°F (default setting of 120°F) Equipped with direct electronic ignition This product is Energy Star certified with a Uniform Energy Factor of 0.98 Flexible venting options with industry leading 2" venting up to 75 feet Approved for high altitude up to 10,200 ft Covered under 15 year heat exchanger, 5 year parts, and 5 year labor manufacturer's warranties Product Technologies: Smart-Sense™: Adaptive gas valve technology - no gas conversion kit required Versa-Vent™: Outdoor vent cap adapts to any SENSEI™ RX Series model for outdoor installation (sold separately) Smart Connect™: Allows you to connect your phone or tablet to SENSEI™ RX Series via Bluetooth® using Rinnai Central™ app Quick-Flush™: Provides an efficient flushing procedure to make periodic preventive maintenance a simple task to perform Ultra Low NOx: Complies with South Coast Air Quality Management District 14 ng/J or 20 ppm NOx Emission Levels Smart Circ™ Intelligent Recirculation™: Smart Circ™ Intelligent Recirculation™ capable with installation of pump or pump accessory (kit sold separately) Specifications: Width: 18-1/2" Height: 30-1/8" Depth: 11-3/8" Fuel Type: Natural Gas Gas Connection: 3/4" Connection Size: 3/4" Water Pressure (Min): 15 PSI Water Pressure (Max): 150 PSI Temperature (Min): 98°F Temperature (Max): 140°F Voltage: 120V