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The Rinnai RU199IN Sensei is an indoor, wall-mounted natural gas tankless water heater with up to 199,000 BTU input and a condensing stainless steel heat exchanger. It delivers continuous hot water at up to 9.8 GPM depending on temperature rise, so it can serve several fixtures at once in a large home. It is Energy Star listed and Ultra Low NOx, and it is Wi-Fi compatible for remote monitoring with optional accessories. Against smaller tankless units it trades a higher input and flow for a larger gas line and venting requirement, and owners of high-demand households tend to favor it for that capacity.
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Owners of the Sensei line generally report strong, consistent hot water for multi-fixture homes and praise the build and efficiency. Complaints tend to center on installation requirements and the cost of accessories for connectivity.
The Rinnai RU199IN Sensei is an indoor, wall-mounted natural gas tankless water heater for residential use. It supplies continuous hot water for multiple fixtures at once. Its input ranges from 15,000 to 199,000 BTU.
It uses condensing combustion and a corrosion-resistant stainless steel heat exchanger. It is direct vent, with several venting options for different installation layouts. Isolation valves and a pressure relief valve are included for easier maintenance.
The unit is Energy Star listed and has Ultra Low NOx emissions. It is Wi-Fi compatible for remote monitoring with optional accessories. Maximum flow is 9.8 GPM at a 40°F temperature rise, and it falls as the temperature rise increases.
