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Q205S – Q Series Condensing Boiler

Q205S Q Series Condensing BoilerENERGY STAR QUALIFIED
205,000 MIN BTU
95.7% MAX


  • Fully modulating pump combines with stainless steel heat exchanger to make this one of the more efficient units available
  • Optional 3-way valve available to eliminate the need for a pump for the indirect tank
  • Compact wall-mounted design saves space over traditional boilers
  • Super quiet operation
  • Outdoor reset function with sensor included
  • Plumbing kits with low-loss header included
  • Available in Natural Gas or Propane
  • Variety of venting options available
  • ASME accredit units


  • Dimensions: 26” W x 27” H x 15” D
  • Weight: 141 lbs.
  • Approved Gas Types: Natural Gas or Propane
  • Minimum/Maximum Gas Rate Input BTUs (Heating): 41,000 – 205,000 (NG) and 74,000 – 205,000 (LP)
  • Maximum Flow Rate: Indirect tank compatible
  • AFUE Rating: 95.7.1% (NG and LP)
  • Optional Digital Controller: RS100