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RUC98i (KA3237FFUD-US)

Condensing Tankless Water Heater

Rinnai's condensing tankless water heaters deliver more efficiency than ever before. Available in four models, suitable for mid- to large-sized home, Rinnai's condensing tankless water heaters offer all the same benefits builders and homeowners have come to expect from Rinnai.

ENERGY STAR® Qualified
Condensing Technology for Greater Efficiency and Significant Energy Savings
Up to 96% Thermal Efficiency
Pre-set at 120°F
Natural Gas and Propane Models Available
Meets California and Texas NOx Emissions Standards
Energy Factor of 0.94 for Both Gas Types
Compatible with Full Line of Rinnai Digital Controllers
Temperature Range with Controllers: Residential (98°F - 140°F) Commercial (98°F - 185°F )
12-Year Warranty on Heat Exchanger, 5 Year Parts, 1 Year Labor for Residential Installations

Width: 18.5 Inches
Height: 26.4 Inches
Depth: 10.1 Inches

71 Pounds

Indoor, Residential and Commercial

Hot Water Capacity
0.4 to 7.6 GPM (50° F rise) and 0.4 to 9.8 GPM (35° F rise)

Approved Gas Types
Natural Gas or Propane

Minimum/Maximum Gas Rate (Input BTUs)
Natural Gas: 9,500 – 199,000 BTU
Propane: 10,300 – 199,000 BTU

Energy Factor
Natural Gas: 0.94
Propane: 0.94

Thermal Efficiency
Natural Gas: 96%
Propane: 96%

AC 120 Volts, 60 Hz

Electrical Consumption
Normal: 80 Watts
Standby: 2 Watts
Anti-Frost Protection: 220 Watts

Gas Connection
Gas Supply: ¾ Inch MNPT
Cold Water Inlet: ¾ Inch MNPT
Hot Water Outlet: ¾ Inch MNPT

Temperature Settings
Residential: 98°F - 140°F
Commercial: 98°F - 185°F (commercial controller must be purchased separately)

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