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The Rinnai RE180eN is a non-condensing natural gas tankless water heater rated at 180,000 BTU and up to 8.5 GPM, sized for whole-home use in households up to about six people. It mounts outdoors, so it frees indoor space and needs no venting through the roof, and it carries an ultra-low NOx rating plus a 15-year limited warranty. It is a high-efficiency unit (0.82 UEF) but not a condensing model, so it trails condensing rivals on efficiency. Owners of Rinnai tankless units generally report steady hot water and long service life, with the usual tankless trade-offs: a cold-water sandwich at startup and annual descaling.
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Lowest price we've seen: $1,091.16 on Nov 9 at Lowe's. Tracked across 2 stores since Nov 9.
Rinnai tankless heaters are widely regarded as reliable, with owners reporting consistent hot water and long service life. Complaints center on the non-condensing efficiency gap and the maintenance tankless units require.
The Rinnai RE180eN is a non-condensing tankless water heater that runs on natural gas. It is rated for commercial and residential use and is designed for exterior installation.
It has a 180,000 BTU rating and a maximum flow rate of 8.5 gallons per minute. The outlet temperature can be set from 98°F to 140°F. It has electric ignition, a display, and Wi-Fi compatibility.
The unit mounts on a wall and connects to water with 3/4-in fittings. It has a Uniform Energy Factor of 0.82 and an Ultra Low NOx emission rating. It is a high altitude model and can be used in mobile homes.
