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The Rinnai RX180iN is a condensing tankless water heater that runs on natural gas (a propane version exists) and delivers up to 10 GPM, enough for two showers plus a running appliance. Its 0.98 UEF puts it among the most efficient gas tankless units sold, and the Smart Sense feature adjusts output to demand. It suits larger households replacing a tank heater or upgrading an older tankless unit. Against rivals, it trades a higher upfront cost for efficiency and flow capacity; owners praise endless hot water and quiet operation, but some note the cost of venting and installation.
Availability unknownSold by mosesbglickllc (99.8% positive, 25,600 ratings)Returns: Set by the eBay seller; the eBay Money Back Guarantee covers an item that doesn't arrive or isn't as described.
Availability unknownSold by efaucets (99.7% positive, 3,500 ratings)Returns: Set by the eBay seller; the eBay Money Back Guarantee covers an item that doesn't arrive or isn't as described.
Availability unknown
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Lowest price we've seen: $1,566.60 on Nov 9 at Amazon. Tracked across 1 store since Nov 9.
Owners generally report reliable endless hot water and lower gas use than their old tank heater. Complaints center on installation cost and the venting and condensate work the unit requires.
