Tengchang 3.2 GPM Natural Gas Hot Water Heater Tankless Stainless Steel 12L Instant Boiler CE Certification;Gas Type: Natural Gas Capacity:12L/min (3.2 GPM), 25 degrees warm water producing rate Working temperature:-8-45 Thermal input: 24 KW; Thermal efficiency: 80.8%; Temperature rise: 25 Minimum working water pressure: 0.025MPa; Gas pressure: 2000Pa