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Features: Never run out of hot water again with a steady 6.6 GPM flow rate Conveniently mounts to your wall for a low profile installation Comes packaged with a remote control for simple operation 4" category III power venting required with a maximum length of 50' Electronic ignition ensures you never have to mess with a pilot light again Complies with lead-free standards and SCAQMD rules for NOx emissions Protected by a multitude of built-in safety features such as freeze protection, an overheat cutoff fuse, constant temperature monitoring, air fuel ratio rod, and flame sensor Includes a 15-year limited warranty on the heat exchanger (6-year in commercial applications) and a 5-year warranty on all parts Durable heat exchanger is constructed of commercial-grade copper resulting in greatly increased heat transfer and resistance to erosion Designed for outdoor use only Specifications: Height: 20-1/2" Width: 13-3/4" Depth: 10" Max BTU Input: 140000 Maximum Flow Rate: 6.6 GPM Fuel Type: Natural Gas Energy Factor: 0.82 Altitude Certification: 6000 Feet Above Sea Level Product Variations: ATO-110U-N (This Model): 6.6 GPM Outdoor Tankless Water Heater ATO-310U-N: 8 GPM Outdoor Tankless Water Heater ATO-510U-N: 10 GPM Outdoor Tankless Water Heater