Rinnai RUC90iP Ultra Series Indoor Propane Tankless Water Heater


Weight: 63.70 lbs

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180,000 BTU condensing heater for home and commercial use.

The Rinnai Ultra Series is the leader in innovation and technology in condensing tankless water heater design. The new RUC90i and RU90e models, available in propane and natural gas, offer an additional BTU option with environmental benefits, energy savings and a space saving design. These condensing units have a maximum flow rate of 9.0 GPM, which increases its usability for condensing applications.  From one application to the next, the Ultra Series Tankles Water Heaters give you the freedom of choice.

  •  Includes FREE hot and cold water Isolation Valve Kit



​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 to 140°F
Commercial: 98°F to 185°F
Approved Gas Types Propane
Minimum Activation Rate 0.4 GPM
Flow Rate vs. Temperature Rise) 70°F at 5.0 GPM. 50°F at 7.0 GPM
Hot Water Flow Rate Range 0.26 to 9.0 GPM
Controllers ​MC-91-2US (included)
MC-195T-US, MC100V-1US, BC-100V-1US, MCC-91-2US (for temperatures > 140°F)
Ultra Low NOx ​Yes
Warranty (Residential) ​Limited 12 years on heat exchanger, 5 years on parts, 1 year on labor (5 year optional on labor)
Warranty (Commercial) Limited 5 years on heat exchanger, 5 years on parts, 1 year on labor (5 year optional on labor)
Mobile Home Certified ​Yes
Certifications ​AHRI, CSA, NSF, Energy Star


Comprehensive Brochure Ultra series Brochure Installation & Operation Manual Specifications

Frequently Asked Question ("FAQ")

Q1: What is the difference between this model, the RUC90ip and the older RU90ip?
A1: There is only one difference. With the RUC90iP, Rinnai added a PVC adapter at the vent opening. Otherwise the units are identical.

Q2: What is the difference between the RU, RUR and RUC series?
A2: Rinnai's RU series heaters such as the RU80e and RU90e are simply the outdoor versions of the RUC units.
The RUR series heaters such as the RUR98i and the RUR98e have a built-in recirculation pump. The RUC series heaters such as the RUC98i and the RUC80i do not have the recirc pump.

All of these heaters are condensing.

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