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The Rinnai RE180 is a natural gas, non-condensing tankless water heater with a built-in recirculation pump. It fires at up to 180,000 BTU and delivers a maximum of 8.5 GPM with a valve, enough for roughly 3 to 5 fixtures, and its Smart-Circ Intelligent Recirculation learns a household's hot water pattern over seven days and schedules the pump to match. It suits small to medium homes and remodels where indoor mounting and faster hot water at the tap matter. Against plain non-condensing tankless units it adds built-in recirculation without a separate pump or bypass, though its 0.82 Uniform Energy Factor trails condensing models and it needs gas and venting work that electric or storage heaters avoid.
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The Rinnai RE180 is a natural gas, non-condensing tankless water heater with a built-in pump. It has a 180,000 BTU input and a maximum flow of 8.5 GPM. It is suited to small and medium homes and remodels, and to 3 to 5 fixtures.
It uses Smart-Circ Intelligent Recirculation technology. The unit learns your hot water usage over a seven-day period, then schedules pump and tankless recirculation to match. This simplified recirculation setup does not need an internal bypass or a recirculation plug/filter.
The unit is about the size of a small suitcase and is designed for indoor installation.
