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The Rinnai RU199IN is a condensing indoor tankless water heater rated at 199,000 BTU, built for whole-home hot water with simultaneous use at several fixtures. Its two-heat-exchanger condensing design reaches a Uniform Energy Factor of 0.93, among the highest for gas tankless units, and it is ENERGY STAR qualified. Circ-Logic recirculation support with an external pump shortens the wait for hot water, and the unit is Wi-Fi ready for remote control. It suits larger households replacing a tank or upgrading an older non-condensing tankless unit; expect professional installation and annual descaling to keep the warranty and efficiency intact.
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Owners of Rinnai condensing tankless units generally report strong, consistent hot water and lower gas use than tank heaters. Common complaints center on installation cost, the need for maintenance, and the wait for hot water without a recirculation pump.
The Rinnai RU199IN is a condensing indoor tankless water heater from the SE+ Series that runs on natural gas. It has two heat exchangers to maximize hot water output and is rated at 199,000 BTU. It is ENERGY STAR qualified with a Uniform Energy Factor of 0.93.
It heats water only when hot water is needed, and it can supply multiple fixtures at the same time. Circ-Logic recirculation can be paired with an external pump to reduce the wait for hot water, on a schedule or on demand. A temperature lock function prevents accidental or unauthorized changes to the water temperature.
The unit is Wi-Fi ready and includes a service valve kit. It complies with South Coast Air Quality Management District NOx emission levels of 14 ng/J or 20 ppm. Professional installation is required.
