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The Rinnai SENSEI RSC199i is an indoor, natural gas condensing tankless water heater rated at 199,000 BTU. It delivers up to 11 GPM and carries a 0.95 UEF, among the highest efficiency figures in its class. Wi-Fi capability lets it connect to Rinnai's control app, and it is ENERGY STAR certified. It suits larger households with high simultaneous hot water demand, such as multiple showers plus laundry. Against non-condensing rivals it is more efficient and more expensive to install because it needs a condensate drain and PVC venting.
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Owners of Rinnai SENSEI condensing units generally report reliable endless hot water and good efficiency. Common complaints center on installer-dependent setup, condensate handling and the cost of proper venting.
The Rinnai RSC199I (SENSEI RSC199iN) is a Super High Efficiency Plus condensing tankless water heater for indoor installation. It runs on natural gas and supplies continuous hot water, with a maximum flow rate of 11 GPM. Its Uniform Energy Factor (UEF) is 0.95.
The unit is Wi-Fi capable and recirculation capable. It is Residential ENERGY STAR certified and SCAQMD approved as Ultra Low NOx. The compact body measures 18.5 inches wide, 31.3 inches high and 11.4 inches deep.
