CHS199100RIN Rinnai Demand Duo Commercial Hybrid Water Heating System Condensing Hybrid System: Condensing tankless, Insulated Storage Tank, Pump & ControlMinimum Gas Consumption Btu/h (kW/h) : 15,200 (4.5)Maximum Gas Consumption Btu/h (kW/h) : 199,000 (58.3)Tank Volume : 119 Gallons (450 Liters)Thermal Efficiency (C199i) : 96%First Hour Delivery : 315 Gallons (1192 Liters)Temperature Setting : 98° F (37° C) to 185° F (85° C)Product Weight : 428 lb (194 kg)Noise level : 52 dBBy-Pass Control : ElectronicGas Supply Pressure Natural Gas : 4.0 - 10.5 inch W.CIgnition System : Direct Electronic Ignition