Check the listing for details. FOGATTI 16L 5.1 GPM 120,000 BTU Tankless Water Heater Outdoor Natural Gas - USED. Color: White, Condition: Used. Listed at 212.49 USD. FOGATTI Natural Gas Tankless Water Heater - Outdoor Installation 5.1 GPM, 120,000 BTU White Instant Hot Water Heater, InstaGas Classic 120S Series Product Details Outdoor installation to save space: The product is installed outdoors and does not occupy the living space. The bottom built-in forced DC fan eliminates the influence of external wind. So as to ensure the stability of combustion, achieve safety, energy saving and no pollution. Endless water supply without preheating: It can run at approximately 5.1 GPM for 40 minutes, enough to produce almost 200 gallons of hot water. Make a multi-point water supply for the whole house to meet your family's water needs. Precise temperature control and stable temperature: The burner can be burnt in sections to meet the water temperature demand in the four seasons. Benefiting from the calculation and control of the heating power 1000/s by the chip, the temperature difference of the water can be precisely controlled within ±2°F. Compact design for easy installation: The tankless design is 1/4 the size of a 50 gallon tank water heater, making it easy to install. The highly integrated components also provide greater safety from water pressure surges without the need to install an expansion tank. Excellent quality and service: CSA certification in the USA and Canada. Superior safety and durability using the world's most advanced technology.