Features: Built in display window. High altitude adjustment. Direct electronic ignition. Durable steel casing with polyester coating. Temperature controls include 120°F (default) with standard temperature settings of 130°F, 135°F, or 140°F. Temperature lockout allows the user to lock the remote at a certain temperature. Standard safety features include flame rod, overheat prevention device, lightning protection device, freeze protection, fan rotation detector, and thermal fuse. Includes warranty of 12 years for the heat exchanger, 5 year on parts, and 1 year pre-approved reasonable labor. Designed for wall mounted outdoor use only. No additional venting pieces required. Product Technologies: Scale Detection Software: If the water has not been treated and is hard, scale can build-up and damage the heat exchanger. The display window will show a warning indication of scale build-up. Multiple warnings will result in the software locking the unit until it is flushed. Freeze Protection: Water freezing within the unit would damage the unit. To prevent this the unit is equipped with an electrical freeze prevention heater. Specifications: Flow Rate: 0.5 to 7.1 gallons per minute Max BTU Input: 157000 Height: 20.5" Width: 13.8" Depth: 6.7" Gas line connection: 3/4" Water line connection: 3/4" Energy Factor: 0.94 (LP) 0.94 (NG) Thermal Efficiency: 93% (LP or NG)