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We offer advanced **natural gas tankless water heating solutions** designed to provide a reliable and continuous supply of hot water while maximizing energy efficiency. The compact SENSEI™ RU199eN system delivers a **0.95 Uniform Energy Factor (UEF)** and features a space-saving design comparable to a small suitcase, making it a practical option for outdoor installations. With a heating capacity ranging from **15,000 to 199,000 BTU**, this high-efficiency condensing water heater is designed to meet a variety of hot water demands. Backed by a **15-year heat exchanger warranty, 5-year parts warranty, and 1-year labor warranty**, it offers dependable performance and long-term value.