Hybrid Tank-Tankless Water Heater

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RH180 click to zoom into photo of
  • Easy installation—similar to traditional tank-style water heater—makes it perfect for remodeling and emergency replacement
  • ½" gas line connection*
  • Standard water connections
  • Uses 4" B-Vent for exhaust
  • First Hour Rating of 180 gallons**
  • No exhaust flue in tank minimizes standby heat loss
  • Easy access to key components for repair
  • Meets all Flammable Vapor Ignition Resistant (FVIR) requirements for the ANSI Z21.10.1-CSA 4.1 Standards

Width: 20 Inches (508 mm)

Height: 51.2 Inches (1,300.5 mm)

Depth: 27.5 Inches (698.5 mm)


168.5 lbs (68 kg)

Installation Type


Minimum/Maximum BTU (Natural Gas)

59,500 / 91,300

Minimum/Maximum BTU (Propane)

47,600 / 87,300

Energy Factor

​80% Thermal Efficiency

Temperature Range

Residential Only: 110°F – 140°F (43°C – 60°C)

Minimum Activation Rate


Flow Rate (70° / 50° Temperature Rise)


Hot Water Flow Rate Range

First Hour Rating: 180 gph‡


Standard: Integrated

Ultra Low NOx


Warranty (Residential)*

HEX 10 years; tank 6 years; parts 3 years; labor 1 year

Warranty (Commercial)*

​Residential Only

Mobile Home Certified


Valves Shipped in Box


High Altitude Approved

Up to 5,400 ft. (1,646 m)



Venting Options

4” UL Listed B-Vent

Tankless Rack System (TRS/TRW) Compatible


1/2" Gas Line Compatible***


* For complete information and details regarding Rinnai’s warranty, please visit rinnai.us.
* To achieve temperatures over 140°F, an MCC-91 commercial controller must be purchased separately.
*** For complete information on gas sizing for Rinnai Tankless Water Heaters, consult the Operation and Installation Manual
‡ Based on DOE first hour test (IOCFR, Part 430).

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