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The Rinnai RE180IN is an indoor, natural gas tankless water heater rated at 8.5 GPM, enough to run several fixtures at once in a large household. It replaces the V75IN and uses a copper heat exchanger in a non-condensing design, so it vents through a standard metal flue rather than PVC. A front LED display, programmable service reminders and an optional leak detection kit make upkeep simpler than on older Rinnai units. It is a step up from the V75IN on capacity and controls, but it is not a condensing model, so it gives up some efficiency to Rinnai's condensing lines.
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Owners of Rinnai tankless units generally report steady hot water and few repairs over years of use. Feedback on the RE series centers on its capacity for larger homes and the convenience of the display and reminders. The main complaints are the non-condensing efficiency and the cost of professional installation and venting.
The Rinnai RE Series RE180IN is an indoor, wall-mount tankless water heater that runs on natural gas. It delivers 0.13 to 8.5 gallons per minute of hot water and is rated at 180,000 BTU with a 0.82 Uniform Energy Factor.
It is a non-condensing unit with a copper heat exchanger and a silver finish. The internal layout is clean, and the unit opens and closes easily for service. An LED display shows information, and programmable service reminders help with maintenance. It replaces the Rinnai V75IN.
A leak detection kit, freeze protection and a mounting bracket are optional and sold separately. The Isolation Valve MIVK-T-LW is required and is also sold separately.
