RUC-90i -


Availability: In stock
Product Code: RUC-90i
Categories: 2 ,



New 180,000 BTU Condensing Models!


Rinnai Ultra Series Tankless Water Heaters deliver innovation and technological leadership in condensing tankless water heating design.  The NEW RUC90i and RU90e, available in natural gas and propane, offer an additional BTU option at energy savings, a space saving design and environmental benefits.  These condensing units will have a maximum flow rate of 9.0 gallons per minute, increasing the choices for Ultra series condensing applications.  From one project to the next, with Rinnai’s Ultra Series Tankles Water Heaters, the freedom of choice is yours.


Dimensions ​Width: 18.5 inches  

Height: 26 inches

Depth: 10 inches

Weight ​61.7 lbs / 28.0 kg
Installation Type Indoor
Minimum/Maximum Gas Range ​15,200 – 180,000 Natural Gas and Propane
Energy Factor ​0.96 for Natural Gas and Propane
Temperature Range ​Residential: 98°F – 140°F  

Commercial: 98°F – 185°F

Approved Gas Types ​Natural Gas or Propane
Minimum Activation Rate ​0.4 GPM
Flow Rate (70° / 50° Temperature Rise) ​5.0 / 7.0
Hot Water Flow Rate Range ​0.26 to 9.0 GPM
Controllers ​MC-91-2US (included)  

MC-195T-US, MC-100V-1US, BC-100V-1US, MCC-91-2US (for temperatures >140°F)

Ultra Low NOx ​Yes
Warranty (Residential) ​Limited 12-year on heat exchanger, 5-year on parts, 1-year on labor (5-year optional on labor)
Warranty (Commercial) ​Limited 5-year on heat exchanger, 5-year on parts, 1-year on labor (2-year optional on labor)
Mobile Home Certified ​Yes
Valves Shipped in Box ​Yes
Certifications ​AHRI, CSA, NSF, Energy Star®