Enviroment: Local


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

*As with all gas appliance applications, installer should check and abide by local gas-pipe size and national fuel gas codes

**Based on DOE first hour test (IOCFR, Part 430)


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***


Electrical Requirements: AC 120 Volts – 60 Hz, supplied with 6-foot plug-in power cord.

Does not meet SCAQMD ULNOx requirements.

*Based on DOE first hour test (IOCFR, Part 430).

** Warranty is based on single-family residential use for domestic hot water only and may change or be voided depending on application and use of recirculation systems. For complete terms and conditions of Rinnai’s standard limited warranty, visit www.rinnai.us/warranty or call 1-800-621-9419.

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