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The Rinnai RU199iN is a condensing indoor tankless water heater with a maximum flow rate of 11 GPM, enough to run several fixtures at once. It heats water only on demand, so it takes up far less space than a tank and avoids standby losses. Circ-Logic works with an external pump for scheduled or on-demand recirculation, and Wi-Fi monitoring lets you check status from a phone. It suits larger homes with high simultaneous demand; against non-condensing rivals it recovers more heat from the exhaust, but it needs professional installation and a condensing unit's drain.
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The Rinnai RU199iN is a condensing tankless water heater for indoor use. It heats water only when needed, so there is no tank to keep hot. Water runs through the pipes continuously, which avoids the rusty sediment that builds up in tank heaters.
It delivers up to 11 GPM of hot water flow. The unit includes Circ-Logic, and with an external pump it can run scheduled or on-demand recirculation to cut the wait for hot water at the faucet. It also offers Wifi monitoring. Professional installation is recommended.
