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The Rinnai SENSEI RX180iN is a condensing indoor tankless water heater rated up to 180,000 BTU and 10.0 GPM, enough for households running several hot-water fixtures at once. It reaches a 0.98 Uniform Energy Factor and is ENERGY STAR certified, so it wastes little heat compared with non-condensing units. The heat exchanger carries a 15-year or 12,000-hour warranty, roughly double what most tank heaters offer. It is Wi-Fi capable and recirculation ready, features budget tankless models often lack, and its suitcase-sized cabinet fits closets and utility walls where a tank will not.
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Owners of the SENSEI RX line report steady hot water across multiple fixtures and quiet operation. Installers note the unit needs proper gas sizing and venting to perform as rated.
The Rinnai SENSEI RX180iN is a condensing tankless water heater rated up to 180,000 BTU/H. It heats water only when it is needed. It is about the size of a small suitcase.
It runs on natural gas or propane. It can be installed indoors, or outdoors with the Versa-Vent accessory. It is recirculation capable and Wi-Fi capable.
Rinnai states that the SENSEI RX Series lasts up to twice as long as tanks and carries twice the warranty length. The heat exchanger is covered for 15 years or 12,000 hours, parts for 5 years and labor for 1 year.
