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The Rinnai RX199iN Sensei is a condensing tankless water heater rated up to 199,000 BTU with a 0.98 UEF, among the most efficient gas tankless units sold. Its Adaptive Gas Valve switches between natural gas and propane without a conversion kit, and the same unit can be installed indoors or outdoors with the RXOVC vent cap. It suits whole-home buyers with high simultaneous hot-water demand, such as multi-bath households. Against rivals like the Navien NPE-240A2, it lacks a built-in recirculation pump, so Smart-Circ recirculation needs a pump or pump kit added.
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Owners of Rinnai Sensei RX units generally report strong, consistent hot water and low operating costs. Complaints center on installation cost and the extra parts needed for recirculation or outdoor venting.
The Rinnai Sensei RX199iN is a condensing tankless water heater from the Pro Build RX Series. It runs on natural gas or propane. Its Smart-Sense Adaptive Gas Valve adjusts to the gas type for combustion, so no conversion kit is needed. A propane gas rating label comes with the unit.
It is an indoor unit with an integrated controller. Outdoor installation is possible with the Versa-Vent outdoor vent cap (RXOVC), sold separately. It has no built-in pump. Smart-Circ recirculation is available when a pump or pump accessory kit is installed.
The unit is Wi-Fi ready, mobile home certified and ultra low NOx. It is compatible with a 1/2" gas line.
