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Note: Product Title reflects this boiler's IBR Net Output Rating.

The Q3 boiler is a hot water boiler heating system which oil-fired cast iron boiler offers high-efficiency. Its cast-iron design is recognized by heating professionals everywhere as the longest lasting, most durable heat exchanger material. Your home will be more comfortable with an Q3 boiler because it does not use household air for combustion. It draws combustion air directly from the outdoors and expels exhaust directly to the outdoors through flexible exhaust tubing. Direct venting also reduces the risk of oily odors entering the living area.

The Q3 boiler is designed to protect against the adverse effects of changing operating conditions. Many boilers suffer from poor combustion and soot buildup when their setup conditions are changed by cold oil, cold air or changes in chimney draft. The contoured shape of Intrepid’s heat exchanger has one of the lowest draft losses in the industry. This supports stable combustion. Burners are configured for each specific model to provide smooth, clean, efficient operation. Unlike most oil boilers, Intrepid’s push nipples are located to the side, out of the way of the flue gasses. This creates more uniform heat transfer, minimizes draft loss and reduces soot build-up. .

Fuel: Oil Fired
System: Hot Water
Combustion: Atmospheric
Capacity: 105-231 MBH
Efficiency: 87.0% AFUE

  • For residential to light commercial requirements
  • Robust triple pass cast-iron heat exchanger
  • Direct Vent model available
  • Installer-friendly features
  • More BTU's per section than ordinary boilers
  • Metal push nipple to connect individual sections
  • 25 Year Limited Lifetime Warranty
  • DOE 2021 compliant
  • Quiet, Energy Star Certified Oil Boiler
  • High Limit Control with easy-to-program dial settings, boiler water temperature reset, low water cut off functionality
  • Compact Footprint
  • Multiple Venting Options
  • Flexible oil line combined with easy access heat exchanger with dual hinge swing door (right or left mount option)
  • Wide flue-ways for easy cleaning
  • Sight glass for flame observation
  • Removable 1/4” test port for draft overfire reading
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Manuals (1)
Fuel Type:




BTU Input:


DOE Rating:


IBR Rating:


Number of Sections:


Vent Size:


Gallons Per Hour:


Vent Type:

Direct Vent

System Type:

Hydronic (Water)

Height (Inches):



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