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The Rinnai SENSEI RX is a condensing gas tankless water heater that heats water on demand instead of storing it in a tank. It reaches about 98% thermal efficiency by capturing latent heat from exhaust gas to preheat incoming cold water, making it roughly 15% more efficient than a non-condensing tankless unit. Output spans 0.13 to 11 GPM across the RX130 through RX199 models, so the larger units suit whole-home use with multiple showers running at once. A switch selects natural gas or propane without a conversion kit, and it is approved for altitudes up to 10,000 ft. Against non-condensing rivals it costs more upfront and needs a drain for condensate, but it uses less gas over time.
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Owners of Rinnai condensing tankless units generally report reliable endless hot water and lower gas use, while installers note the setup demands are higher than for tank or non-condensing units.
The Rinnai SENSEI RX is a condensing gas tankless water heater that heats water on demand. It delivers 0.13 up to 11 GPM of hot water, and hot water continues as long as the gas and water supplies do. A condensing unit captures latent heat from exhaust gas to preheat the incoming cold water, which makes it up to 15% more efficient than a traditional non-condensing tankless water heater. Thermal efficiency is 98% or more.
It mounts on the wall, which frees up floor space, and it can be installed indoors or outdoors. A modulating burner with uniform flame coverage supports efficiency and performance. Adaptive gas valve technology lets it run on natural gas or propane with the flip of a switch, and no conversion kit is needed. It is approved for altitudes up to 10,000 ft and is mobile home certified.
A digital control panel lets you set output temperatures precisely. Smart Connect links a smartphone or tablet to the unit, and automatic frost protection is built in. A Quick Flush Cycle makes periodic maintenance a press of a button. This is a gas appliance and requires certified, professional installation.
