Rinnai's RU Ultra Series Tankless Water Heater has a built-in Rinnai Circ-Logic recirculation program that cycles an external pump at preset intervals and temperatures to maximize efficiency and comfort.

RINNAI RU Ultra Series

RINNAI RU-80

Dimensions: 18.3" width / 26" height / 10" depth

Weight: 70.5 pounds

Ignition: Direct Electronic

Hot Water Capacity: 0.26-8.0 GPM

Minimum Activation Rate: 0.4 GPM

Min/Max Gas Rate (Input BTUs): 15,200-152,000

Energy Factor: 0.96 for Natural Gas or Propane

Energy Star: Yes

Approved Gas Types: Natural Gas or Propane

Ultra Lox NOx: Yes

Electrical: AC 120 Volts, 60 Hz

 

Temperature Settings:

  • 98 degrees F - 140 degrees F with MC-91-2US

  • 98 degrees F - 185 degrees F with MCC-91-2US

Type of Controller:

  • MC-91-2US (included)

  • MCC-91-2US (optional for commercial or hydronic applications)

  • MC-100V-1US Deluxe Controller (optional)

  • BC-100V-1US Bathroom Controller (optional)

Electrical Consumption:

  • Normal: 42 Watts

  • Standby: 2 Watts

  • Anti-Frost Protection: 168 Watts

Service Connections:

  • Gas Supply: 3/4 Inch MNPT

  • Cold Water Inlet: 3/4 Inch MNPT

  • Hot Water Outlet: 3/4 Inch MNPT

                                   

RINNAI RU-98

Dimensions: 18.3" width / 26" height / 10" depth

Weight: 61.7 pounds

Ignition: Direct Electronic

Hot Water Capacity: 0.26-9.8 GPM

Minimum Activation Rate: 0.4 GPM

Min/Max Gas Rate (Input BTUs): 15,200-199,000

Energy Factor: 0.95 for Natural Gas or Propane

Energy Star: Yes

Approved Gas Types: Natural Gas or Propane

Ultra Lox NOx: Yes

Electrical: AC 120 Volts, 60 Hz

 

Temperature Settings:

  • 98 degrees F - 140 degrees F with MC-91-2US

  • 98 degrees F - 185 degrees F with MCC-91-2US

Type of Controller:

  • MC-91-2US (included)

  • MCC-91-2US (optional for commercial or hydronic applications)

  • MC-100V-1US Deluxe Controller (optional)

  • BC-100V-1US Bathroom Controller (optional)

Electrical Consumption:

  • Normal: 63 Watts

  • Standby: 2 Watts

  • Anti-Frost Protection: 168 Watts

Service Connections:

  • Gas Supply: 3/4 Inch MNPT

  • Cold Water Inlet: 3/4 Inch MNPT

  • Hot Water Outlet: 3/4 Inch MNPT