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The Rinnai RX199iN is a condensing tankless water heater rated at 199,000 BTU with a 0.98 Uniform Energy Factor and 97% thermal efficiency. It delivers up to 11.1 GPM and can run on natural gas or propane, and it installs indoors or outdoors with the Versa-Vent accessory. It suits larger homes with high simultaneous hot-water demand, such as two showers plus laundry. Against non-condensing tankless units it is more efficient and carries a longer heat exchanger warranty, but it needs gas supply, venting and power planned at install.
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Owners of the SENSEI RX line generally report steady hot water and low operating costs, with efficiency and build quality standing out. Complaints tend to center on installation requirements and the need for qualified service.
The Rinnai SENSEI RX199iN is a condensing tankless water heater that runs on natural gas or propane. It is about the size of a small suitcase. It can be installed indoors or outdoors using the Versa-Vent accessory.
It heats water only when it is needed, which saves energy, so hot water does not run out. The RX Series lasts up to twice as long as tank water heaters and carries twice the warranty length. The unit is recirculation capable and Wi-Fi capable.
