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Features: Never run out of hot water again with a steady 10 GPM flow rate Conveniently mounts to your wall for a low profile installation Features a built-in temperature controller and factory installed power cord 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 on the heat exchanger (6-year in commercial applications) and a 5-year on all parts Easily link up to 4 units without needing additional parts or accessories, and up to 20 units with the TM-MC01 (sold separately) Durable heat exchanger is constructed of commercial-grade copper resulting in greatly increased heat transfer and resistance to erosion Designed for indoor use only Specifications: Height: 20-1/2" Width: 13-3/4" Depth: 10" Max BTU Input: 199000 Maximum Flow Rate: 10 GPM Fuel Type: Natural Gas Energy Factor: 0.82 Altitude Certification: 10100 Feet Above Sea LevelProduct Variations: ATI-110U-N: 6.6 GPM Indoor Tankless Water Heater ATI-310U-N: 8 GPM Indoor Tankless Water Heater ATI-510U-N (This Model): 10 GPM Indoor Tankless Water Heater