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

Height: 51.2 Inches

Depth: 27.5 Inches


168.5 lbs, 68 kg (empty)

Installation Type


Storage Tank

40 Gallons

Temperature Range

110°–140° F (5 set points)

Minimum/Maximum (natural gas)

59,500 / 91,300

Minimum/Maximum (propane)

47,600 / 87,300

Thermal Efficiency


First Hour Rating

180 Gallons


4” UL Listed B-Vent

Residential Warranty**

HEX 10 yrs; tank 6 yrs; parts 3 yrs; labor 1 yr

Ignition System

Direct Electronic Ignition

Maximum Altitude

Up to 5,400 ft



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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