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Internet # 306655609

Model # RUCS65iP

Store SKU # 1003546091

Super High Efficiency 6.5 GPM Residential 130,000 BTU/h Propane Interior Tankless Water Heater

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  • Enjoy endless hot water
  • Less space for heating gives you more space for living
  • Professional installation recommended; please call 833-746-6210
  • View More Details
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Return this item within 90 days of purchase. Read Return Policy
Product Details

About This Product

Welcome to ultimate efficiency. With technology that operates only when hot water is needed, super-efficient heating coils, no pilot light and no storage tank to heat and reheat water, you save on energy and utility costs. In fact, Rinnai Tankless Water Heaters use up to 40% less energy than a traditional tank water heater. Plus, with premium technology, increased energy efficiency, an improved Home Energy Rating System (HERS) Index Score and optimized LEED eligibility, our tankless solutions can increase your home's value. You can even qualify for energy efficiency rebates and tax credits. It's a smart investment for now and the future.


  • Save time with hot water whenever and wherever you need it, any size home, even for simultaneous uses at multiple fixtures
  • Save energy and reduce utility costs by operating only when hot water is needed
  • Maximum output, minimum space; suitable for installation in non-traditional spaces such as crawl spaces and attics
  • Multiple venting options available including PVC/CPVC using the Ubbink concentric to twin pipe adaptor allow for an easy installation
  • Automatic frost protection
  • Residential warranty: limited 12-year on heat exchanger, 5-year on parts, 1-year on labor (5-year optional on labor); commercial warranty: limited 5-year on heat exchanger, 5-year on parts, 1-year on labor (2-year optional on labor)
  • *Note. Rinnai is changing the language in its warranty terms and conditions found in the current User Installation manuals. The existing statement will be replaced by the following: "This Limited Warranty applies only to products that are installed in the United States and Canada. Improper installation may void this Limited Warranty. It is recommended that a trained and qualified professional who has attended a Rinnai installation training class complete your installation." All warranties (old or new manual) will be honored as written above.
  • You can be confident in choosing to install Rinnai tankless technology in your home; our commitment to quality has made us the #1 selling tankless water heating brand in North America; your family deserves nothing less
  • Professional installation recommended; please call 833-746-6210
  • Rinnai branded accessories will ensure optimal performance of your Rinnai Tankless Water Heater.
  • Click here for more information on Electronic Recycling Programs
  • Return Policy
  • California residents
     see Prop 65 WARNINGS

Product Information

Internet # 306655609

Model # RUCS65iP

Store SKU # 1003546091


Dimensions: H 26 in, W 18.5 in, D 10.1 in


Product Depth (in.)

10.1 in

Product Height (in.)

26 in

Product Width (in.)

18.5 in

Vent diameter (in.)

3 in

Water Connection Size (in.)

3/4 in


Application Type


BTU Rating


Efficiency Level


Finish Family


First Hour of Delivery (gallons/hr)


Flow Rate @ 35°F Rise (gallons/min)

6.5 gal (US)/min

Flow Rate @ 45° Rise (gallons/min)

5.3 gal (US)/min

Flow Rate @ 55° Rise (gallons/min)

4.3 gal (US)/min

Flow Rate @ 65° Rise (gallons/min)

3.8 gal (US)/min

Fuel Type


Gas Connection Size

3/4" MNPT

Gas Type


Heat Exchanger Warranty

12 Year



Maximum Temperature (F)

185 F

Minimum Activation Rate (gpm)


Minimum Temperature (F)

98 F

Number of Showers


Pack Size


Product Weight (lb.)

57.3 lb

Required Volt Connection

120 volt



Total BTU (Btu)

130000 Btu

Uniform Energy Factor


Vent Type

Single Wall

Water Heater Features

Freeze Protection, Overheat Protection, Ultra LoNox, Wall Mounted, WiFi

Warranty / Certifications

Certifications and Listings

CSA Listed

Labor Warranty

1 Year

Part Warranty

5 Year

Questions & Answers

Q:Can this uint be vented via floor of a tiny home on wheels vs. through wall?
by|May 21, 2023
1 Answer
Answer This Question

A:  Hello Amos, Rinnai tankless water heaters are recommended to be vented through a wall or roof. Call our customer care specialist team at 800-621-9419 between the hours of 8 A.M. and 8 P.M. EST Monday through Friday and will be happy to assist you with any venting questions. - Thank You, Brittany

by|May 23, 2023
    Q:can this unit be used with radiant heating system?
    by|Mar 28, 2023
    1 Answer
    Answer This Question

    A:  Greetings Dave, Please contact Rinnai directly at 1-800-621-9419. Thank you!

    by|Apr 4, 2023
      Q:Will this heater work at 8900 ft. above sea level?
      by|Mar 17, 2023
      1 Answer
      Answer This Question

      A:  Greetings, Please contact Rinnai directly at 1-800-621-9419. Thank you!

      by|Mar 23, 2023
        Q:Will this unit work indoors but at freezing temperatures? With a low incoming water temperature?
        by|Feb 21, 2023
        1 Answer
        Answer This Question

        A:  Greetings, Please contact Rinnai directly at 1-800-621-9419. Thank you!

        by|Feb 22, 2023
          Showing 1-4 of 8

          Customer Reviews

          4.4 out of 5

          • 4.4 out of 23 reviews
          • 75% recommend this product
          Filter by:
          Showing 1-10 of 23 reviews
          Good product itself, not the best for my situation
          The quality of this product appears to be good. However, it is sensitive the water flow and pressure which poses a problem for my occasional low flow low pressure well pump.
            Rebate Problem
            Good product so far but rebate was impossible never did get it.
              Pretty amazing tankless water heater.
              I've had it for close to 4 months now. It heats up my water super fast and is pretty efficient. My only complaint is it has a pen size hole that leaks water out of it at a very slow drip on the brass hot side that I can't do anything about. It came from manufacture that way.
                Excellent product
                We have had our tankless water heater for about 6 months. It works flawlessly. We installed it ourselves but I do not recommend that if you are not pretty handy. We initially had issues but the mistake was on our end. Once discovered, it worked great. Highly recommend!
                  Love the tankless!
                  We prefer Rinnai to the R***m ones. If we could afford it, we would replace the other two we have with Rinnai today. But we have to wait for the R***m totally fail.
                    Instructions were very lacking. No pressure relief valve either....
                    Instructions were very lacking. No pressure relief valve either.
                    • Verified Purchase
                    Easy Installation
                    Easy to install and set up. Very hot water.Vent line was biggest challenge.
                      Indoor water heater
                      Don't have to reset after power outage easy filter cleaning 5 months use
                        Works as expected.
                        I like having unlimited hot water, buyers need to understand the difference between unlimited and instant. This is not instant hot water.
                          Rinnai way better than Aquastar
                          Recently installed it when our latest Aquastar died after 6 years. We used Aquastars for 25 years. It fit in the same space with no problem. Way better response and multiple fixture use. It took a bit to increase the pressure pump to 50 psi but after that it is great. Had it for 5 months so far.
                            Showing 1-10 of 23 reviews