i120CN I-Series Model Series

The I- Series i120CN model features Rinnai’s exclusive self-cleaning stainless-steel heat exchanger coupled with a secondary flat plate heat exchanger. Our combi models can deliver whole house heating and simultaneous domestic hot water. The i120CN provides an input rating of 120K Btu. Fueled with either Natural Gas or Propane this Rinnai condensing gas boiler has obtained one of the highest AFUEs (Annual Fuel Utilization Efficiency) in the industry. Plus, the compact wall-mounted design saves space over traditional boilers.

  • 15,000 BTU (minimum)
    199,000 BTU (maximum)
  • Warranty
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The I- Series i120CN model features Rinnai’s exclusive self-cleaning stainless-steel heat exchanger coupled with a secondary flat plate heat exchanger. Our combi models can deliver whole house heating and simultaneous domestic hot water. The i120CN provides an input rating of 120K Btu. Fueled with either Natural Gas or Propane this Rinnai condensing gas boiler has obtained one of the highest AFUEs (Annual Fuel Utilization Efficiency) in the industry. Plus, the compact wall-mounted design saves space over traditional boilers.

Supply Connections

Connection Connection Size
Gas 3/4" MNPT / (19 mm)
Cold Inlet 3/4" MNPT / (19 mm)
Hot Outlet 3/4" MNPT / (19 mm)
Product Depth 10.9 in / (276 mm)
Product Height 26.4 in / (671 mm)
Product Width 18.5 in / (471 mm)
Product Weight 76.1 lb / (34.5 kg)
Gas Type Natural Gas
Recirculation Capable Yes
Residential ENERGY STAR® Yes
Domestic Hot Water Flow Rate (Maximum) 9.8 GPM / (37.1 l/min)
SCAQMD Approved Ultra Low NOx
Central Heating Capacity 120,000 BTU / (35.2 kW)

Warranty information is available in the Installation & Owner Manual.

Browse product manuals, spec sheets, and other documentation below.

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100000313 OPU Instructions-English and French
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800000113-I-Series Boiler Conversion Manual
PDF 2 MB
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Energy Guide - i120C
PDF 605 KB
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800000111-Fr-I-Series Condensing Combi Boiler Installation and Operation Manual_Fr
PDF 11 MB
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800000111-I-Series Condensing Combi Boiler Installation and Operation Manual
PDF 11 MB
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800000114-Fr-I-Series Condensing Combi Boiler User Manual_Fr
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800000114-I-Series Condensing Combi Boiler User Manual
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Brochure_I-Series_Boiler_R-TR-HT-E-11
PDF 648 KB
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Sell Sheet_I-Series Boiler_R-TR-HT-E-12
PDF 508 KB
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100000666 IPEX System 636 Spec Sheet
PDF 453 KB
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800000138 I-Series Combi Boiler Plumbing Kit Spec Sheet
PDF 445 KB
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800000167 - I-Series Combi Engineering Spec Sheet
PDF 107 KB
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800000276 I-Series Combi Boiler Plumbing Kit Spec Sheet-French
PDF 363 KB
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800000277 I-Series Combi Boiler Plumbing Kit Spec Sheet-Spanish
PDF 350 KB
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Spec Sheet: I-Series Combi Boiler
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Announcing IPEX System 1738 PVC Approval Technical Bulletins English
PDF 294 KB
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TB-079 Rinnai Ubbink Venting
PDF 1 MB
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TB-080 Termination Diverter Kit
PDF 47 KB
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TB-157 Hydraulic Separation Required for Rinnai Boilers
PDF 582 KB
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TB-158 I-Series Boiler with DHW Recirculation
PDF 728 KB
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TB-160 I-Series Boiler Combustion Analysis
PDF 235 KB
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TB-164 Warranty Update to I-Series
PDF 273 KB
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TB-165 New Clearances for Twin Pipe Venting Systems
PDF 308 KB
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TB-166 Updates to PC Board Ignition Sequence
PDF 259 KB
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TB-169 I-Series Condensing Boiler Product Updates
PDF 669 KB
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TB-171 New I-Series Boiler Venting Configuration
PDF 343 KB
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TB-172 Rinnai Products With Natural Gas-Hydrogen Mixture Fuels
PDF 279 KB
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TB-181 Higher Vinegar Concentration for Descaling_With MSDS
PDF 417 KB
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800000115-I-Series Combi Boiler Tech Data Sheet
PDF 1 MB
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800000141 I-Series Boiler Check Sheet
PDF 1 MB
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800000162 I-Series System Application Drawings
PDF 4 MB
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800000161_Warranty_I-Series_Boilers
PDF 297 KB
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