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The Rinnai RE199 is a natural gas, non-condensing tankless water heater rated at 199,000 BTU and up to 9.8 GPM with a valve, sized for small to medium homes and 3 to 6 fixtures. It is an indoor unit about the size of a small suitcase and adds Smart-Circ intelligent recirculation, which keeps hot water ready without the internal bypass and recirculation plug/filter older setups needed. Its Uniform Energy Factor of 0.82 is decent for a non-condensing unit but below the 0.90-plus of condensing rivals, which cost more and need a drain for condensate. The warranty is strong for the class: 15 years on the heat exchanger, 5 on parts and 1 on labor.
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Owners and installers generally rate the RE199 series highly for reliable endless hot water, quiet operation and straightforward installation, and the long heat exchanger warranty is often cited. The main complaints are about efficiency compared with condensing units and the cost of professional installation and venting.
The Rinnai RE199iN is a natural gas, non-condensing tankless water heater for indoor installation. It is sized for small to medium homes or remodels and is about the size of a small suitcase.
It has an internal 199,000 BTU burner and a maximum flow of 9.8 GPM, with a valve. It suits 3 to 6 fixtures. Smart-Circ intelligent recirculation simplifies recirculation: no internal bypass or recirculation plug/filter is needed.
The Uniform Energy Factor is 0.82. The heat exchanger has a limited 15-year warranty, parts have 5 years, and labor has 1 year.
