Model #: ATI-540H-N; Application: Residential or Commercial; Gas Type: NG; Min. BtuH Input: 15,000; Max. BtuH Input: 199,000; Hot Water @ 35°F Rise Capacity: 10; Hot Water @ 45°F Rise Capacity: 9; Hot Water @ 70°F Rise Capacity: 5.5; Width: 17-3/4"; Height: 23-5/8"; Depth: 11-1/4"; Wt. Lbs.: 71;