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The Rinnai REP199iN is an indoor natural gas tankless water heater rated at 7.9 GPM and 199,000 BTU, with a built-in recirculation pump that learns your hot water habits. It is non-condensing, so it vents through concentric PVC/CPVC pipe with a single wall or roof penetration. It suits small to medium homes and remodels that want endless hot water and faster delivery at the tap. Against condensing rivals it gives up some efficiency (0.81 UEF) but installs more simply and needs no condensate drain.
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The Rinnai REP199iN is an indoor, natural gas, non-condensing tankless water heater with a built-in recirculation pump. It is rated at 7.9 GPM and 199,000 BTU. It is sized for small to medium homes or remodels and is about the size of a small suitcase.
It heats water only when hot water is needed, and it can supply multiple fixtures at the same time. Smart-Circ recirculation learns your water usage patterns and provides hot water on your schedule. Homes without a dedicated return line need a thermal bypass valve, which is sold separately, to use recirculation.
It can be installed in non-traditional spaces such as crawl spaces and attics. The concentric PVC/CPVC venting uses an inner pipe for exhaust and an outer pipe for fresh outdoor air. This makes it a direct-vent system with one penetration through the wall or roof, either vertical or horizontal. Professional installation is required.
