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The State Adapt®+ Premium Condensing Tankless Water Heater (Model STHR-199X3 100) is a high-efficiency natural gas water heating solution designed for residential use. With a maximum input of 199,000 BTU and a flow rate of up to 10.5 GPM under specified conditions, it delivers on-demand hot water while helping reduce energy consumption. Its integrated X3® Scale Prevention Technology helps protect the heat exchanger from mineral buildup, supporting long-term performance and durability. Additional features include a built-in recirculation pump, digital controls, flexible indoor or outdoor installation options, and the ability to connect up to 12 compatible units for higher hot water demands. ENERGY STAR® certified with a 0.95 Uniform Energy Factor, this model offers an efficient and versatile solution for modern home water heating.