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The Rinnai RE199IN is an indoor natural gas tankless water heater with a 199,000 BTU modulating burner and up to 9.8 GPM of continuous hot water. It is non-condensing, so it vents through a compact 3"/5" concentric pipe and plugs into a standard 120V outlet. That makes it a simpler retrofit than condensing units, which need PVC venting and a drain for condensate, but it gives up efficiency: UEF 0.82 versus about 0.95 for Rinnai's condensing RU models. It suits larger homes running several fixtures at once, especially where a short vent run and easy installation matter more than top efficiency. Owners of Rinnai tankless units generally report steady hot water and long service life, with the usual tankless caveats of annual descaling and a cold-water sandwich at low flow.
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Owners of Rinnai tankless heaters generally praise reliable, endless hot water and solid build quality. Common complaints center on maintenance and the cold-water sandwich at low flow.
The Rinnai RE199IN is an indoor, non-condensing, natural gas tankless water heater. It has a modulating burner rated from 10,400 to 199,000 BTU/h and delivers up to 9.8 GPM. It heats water only when needed, so there is no standby heat loss from a storage tank.
The burner adjusts its output to demand, and hot water starts at a low activation flow of 0.4 GPM. The unit has a cleanable inlet water filter and supports routine flushing for scale management. Operating sound is around 54 dB.
It mounts on the wall and uses a 3"/5" concentric vent system. It plugs into a standard 120V outlet and has 3/4" NPT gas and water connections. An integrated controller adjusts temperature on the unit. An optional Wi-Fi module (Control-R) adds remote monitoring, scheduling and alerts.
