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Condensing Wall-Mounted Gas Boiler Q205SN Rinnai

Condensing Wall-Mounted Gas Boiler
Q205SN Up to 205 MBH | 95.7% AFUE

Grants Available Energy Star Certified
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Optimum comfort. Minimum heating costs.

Heat an entire home – even get domestic hot water – with the economical, reliable and compact choice from Rinnai. Now, the premier name in tankless water heating brings you two new series of wall-mounted, condensing gas boilers that can be easily retrofitted to replace traditional, less efficient boilers or provide simple, space-saving installation in new builds. All seven models feature Rinnai’s exclusively designed stainless steel heat exchanger to deliver unparalleled performance and efficiency.


Choose from two lines, designed to fit your application.

Rinnai offers more effi ciency, more energy cost savings and more durability. Choose from the Rinnai E Series, perfect for homes with small domestic hot water needs, or the Q Series, ideal in all homes where more sophisticated demands call for zone heating. Four heating-only models and three combi models offer maximum BTU inputs ranging from 75,000 to 205,000 and operate on either natural or LP gas.



  • 41,000-205,000 (Natural Gas)
  • 74,000-205,000 (LP Gas)
  • Up to 96.5% AFUE efficiency
  • Stainless steel primary boiler heat exchanger
  • Copper nickel integrated secondary plate exchanger
  • Compact wall-mounted design saves space over traditional boilers
  • Super quiet operation
  • Optional internal 3-way valve eliminates the need for a pump for the indirect tank
  • Outdoor reset function with sensor included
  • Plumbing kits with low-loss header included
  • Choose between propane or natural gas units (conversion kits available)
  • Variety of venting options available, with direct-vent ready out-of-the-box; dual-pipe adaptor included
  • ASME accredited units
  • ENERGY STAR® qualified models

Rinnai Q Series

  • Fully modulating pump combines with stainless steel heat exchanger to make this one of the more efficient units available
  • Combi unit includes 6.6 gallon fully insulated indirect tank
  • Optional 3-way diverter valve (indirect DHW tank kit) available for “S” System models


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