• Q90 Condensing Boiler

    Q90 Series 4

Q90 Series 4

Q90 Series 4

The Q90 Series 4 condensing boiler offers a 90% AFUE efficiency rating in a small compact design ideal for low clearance/limited space applications. It features a high efficiency cast aluminum heat exchanger with low pressure drop, hot surface ignition (HSI) boiler control and a Hydrolevel combination high limit/low water cut off control with a boiler water temperature reset feature. A stainless steel premix burner provides corrosion resistance and longevity.

The Q90 is a sealed combustion boiler which is approved for polypropylene venting and includes an induced draft blower with adjustable exhaust (front, right side or rear).

This unit has a 15 year limited warranty.


  • Capacity: 50 - 75 - 100 MBH
  • Heat Exchanger: Cast Aluminum
  • Combustion: Sealed Combustion
  • Venting: Direct Vent
  • Boiler Type: Hot Water
  • Boiler Control Module: HSI Integrated Boiler Control
  • Combination Hydrolevel High Limit and LWCO with boiler water temperature reset feature
  • Heat Exchanger: Cast Aluminum Heat Exchanger
  • Combustion: Stainless Steel Premix Burner
  • Induced Draft Blower with adjustable exhaust (front, right side or rear), Inducer Motor Assembly includes 5' schedule 80 2" CPVC and CPVC Tee
  • Electrical: Junction Box, Transformer and Wiring Harness
  • Textured painted steel jacket
  • Other
    • Temperature/Pressure Gauge
    • 30 PSI Safety Relief Valve
    • Pressure Switch(es)
    • Low Profile Condensate Trap
    • Air Vent
    • Leveling Legs


  • Natural Gas or Propane
  • Taco or Grundfos Circulator


Easy to Install & Service:

  • Choice of multiple supply and return locations (top, side or combination)
  • Leveling legs
  • Junction Box provided
  • Removable control panel for quick access
  • Low profile condensate trap provides easy plumbing of condensate drain lines

Documents / Resources

Current Documents
Archived Documents


User Manual

Installation & Operation Manual

Parts Lists


Technical Bulletin

Product Bulletin

Service Bulletin



Engineering Documents / Resources

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