Rinnai RUR Series Review

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Find how the new RUR series from Rinnai manufacturer brings great benefits for any residential and light commercial application. Explore the latest and advanced features and see how Rinnai RUR line of tankless water heaters compares to other models.

Models review

Rinnai RUR98i

Rinnai RUR water heaters are the 2014 released products that are available for the indoor installations, model RUR98i, and outdoor installation, model RUR98e, both utilizing tankless and condensing technology.

What makes Rinnai RUR series unique is the water heating recirculation technology that utilizes the built-in pump and thermal bypass valve, with the dedicated recirculation line mode.

This feature ensures faster hot water delivery throughout the home, with the significant reduced wait time, convenience and comfort. It also reduces the energy consumption and green house emission.

With the provided 24-h digital controller, even more energy can be saved, as the hot water usage can be scheduled 24 hours, 7 days a week.

Other common features include the built-in remote controller for temperature and error code display, thermal bypass valve for cross over mode, isolation valves for easy service, two heat exchangers for years of operation and many others.

Either installing outdoor or indoor models, they both have the ability to work on natural gas, or with the conversion kit the propane gas from the gas storage tanks.

Rinnai RUR98e

Rinnai RUR Ultra series water heaters are able to produce a maximum power of 199,000 Btu and great hot water flow rate of 9.8 GPM, which makes them great for 4-bath homes.

Thanks to the modulating gas valve the power can be reduced from 199,000 Btu to low 15,200 Btu and water flow rate to 0.26 GPM, which is great for small jobs, such as shaving or face washing.

With the included controller, the temperature of hot water can be adjusted from the minimum 98F to the maximum 140F, in residential applications.

The temperature controller is built into the front panel of the indoor water heater RUR98i, and except the temperature control, it is also very useful for problem diagnostics, as it displays the error codes.

Rinnai RUR98i model is a direct vent unit that utilize the concentric vent or twin pipe PVC/CPVC configuration, while the RUR98e is ventless, it uses the forced combustion and is installed outside from where it uses the fresh air for combustion and where it releases the products of combustion.

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Features review

  • Maximum energy factor of 0.95 and Energy Star approval ensures great energy savings and reduced NOx emission.

  • Built-in Rinnai Circ-Logic program allows pump recirculation.
  • More venting options on the same unit by using the concentric PP and dual PVC/CPVC.

  • Easily adapts to existing plumbing with or without the dedicated return line.

  • Digital controller included with both models. With the time and duration adjustment of the circulation system operation, the energy savings are maximized.
  • Ultra Low NOx emission, thanks to the green condensing technology.

  • Safety features include; flame rod, boiling protection, combustion fan rpm check, thermal fuse, frost protection, OHS and over current protection.

  • Standard gas and water connections of 3/4".
  • Warranty; 12 years on heat exchanger and 5 years on parts.


RUR98i RUR98e
Gas Input
Water Flow
0.26-9.8 0.26-9.8
Energy Factor
0.95 0.95
Activation rate
0.4 0.4
Temp. settings
98-140 98-140
Electric consumption
205 201
Max. vent
65 N/A
Altitude height
10200 10200
18.5x26x10 18.5x26x10
72.8 72.8


Rinnai RUR series of tankless water heaters is a good buy. They are small and save space, easy to install and maintain, provide endless hot water in continuous supply, fast and with less waste. These gas appliances are ultra efficient and green, also smart to modify the power based on the needs, and can diagnose the problem for easy troubleshooting.

(Photo credit to Rinnai)