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Rinnai RU80iN
Interior, 8.0 GPM, Natural Gas, Tankless Water Heater

Compare to:$1,646.78
You save:$468.79

 Available in four models, suitable for mid- to large-sized homes, Rinnai’s new Ultra Series Condensing Tankless Water Heaters offer all the same benefits builders and homeowners have come to expect from Rinnai. Never run out of hot water again, and enjoy the space savings, convenience, ease of installation and peace of mind for which Rinnai is famous. 

 Rinnai’s unique condensing design incorporates two innovative heat exchangers to achieve optimum heating value from every cubic foot of natural gas or propane. The stainless steel system recaptures residual heat from flue gases to pre-heat incoming ground water, which then circulates to the primary copper heat exchanger.

Delivering an Energy Factor (EF) up to .96, Rinnai’s tankless condensing units are ideal for residential and commercial applications and can be banked for even greater capacity

RU Series interior-mount units can be placed in any room, vent directly to the outside and have an integrated condensate collector.  All RU units contain a newly designed, commercial-grade dual heat exchanger for optimum durability.  Homeowners get the reliability of commercial-grade construction and an industry-leading 12-year limited warranty.

Standard Features

  • Energy Factor (EF) up to .96
  • Condensing technology for high efficiency and energy savings
  • Enough capacity to supply continuous hot water simultaneously to multiple plumbing demands
  • Significant space savings over tank-style water heaters
  • Long-lasting design and reduced risk of flooding
  • Included isolation valves to insure professional and serviceable installations
  • Applicable for both residential and commercial applications due to commercial-grade heat exchangers
  • Temperature range with standard MC-91 controller (included): 98°F to 140°F
  • Temperature range with MCC-91 commercial controller: 98°F to185°F
  • Pair up with an air handler for efficient home heating
  • Meets California and Texas NOx emission rules
  • ENERGY STAR® qualified
  • Residential Warranty: 12-year heat exchanger / 5-year parts & labor
  • Commercial Warranty: 5-year heat exchanger & parts / 2-year labor


Flat Rate Return Shipping
Low Cost Prepaid Return Shipping

Liftgate Delivery Option (Basic Delivery is FREE)
Liftgate Delivery


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Standard Termination Kit - For Horizontal Termination
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21" Standard Termination Kit - For Horizontal Termination
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Raised Horizontal Termination Kit ("Snorkel")
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Rinnai / Ubbink 224077PP
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Rinnai / Ubbink 224078PP
90° Vent Pipe Elbow
224052 Front Rinnai / Ubbink 224079PP
19.5" Vent Pipe Extension
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39" Vent Pipe Extension
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10" Vent Pipe Extension

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Deluxe Bathroom Control for Rinnai Tankless Water Heaters - Silver
BC-100V-1W Front Rinnai BC-100V-1W
Deluxe Bathroom Control for Rinnai Tankless Water Heaters - White
MC-100V-1S Front Rinnai MC-100V-1S
Deluxe Control for Rinnai Tankless Water Heaters, Silver
Rinnai MC-100V-1W Front Rinnai MC-100V-1W
Deluxe Control for Rinnai Tankless Water Heaters - White
MC-91-1S Front Rinnai MC-91-1S
Standard Control for Rinnai Tankless Water Heaters - Silver
MC-91-1W Front Rinnai MC-91-2W
Standard Control for Rinnai Tankless Water Heaters - White
Rinnai MSA-2M Package Rinnai MSA-2M
Multi-Water Heater Connection Kit
Rinnai MSA-2S
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Multi-Water Heater Expansion Accessory (Use w/ MSA-2M)

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(800) 865-5931
Monday to Friday
8:30am - 5:00pm Central
  Mailing Address
1901 N. Clybourn Avenue
Suite 200
Chicago, IL 60614
[email protected]
or Contact Us Here
(425) 928-2455
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