- Fuel: Oil-Fired
- System: Hot Water
- Combustion: Atmospheric
- Capacity: 4 sizes, .75 to 1.65 GPH Firing Rates
- Efficiency: AFUE 87.0%

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. It’s an ideal choice for new construction.
The Q3 is DOE 2021 compliant
Related products
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R Series
R Series- Material: 18, 16 & 14 gauge
- Heights: 9-7/8" (one tier), 14" (one tier), 21" (two tier) & 28" (three tier)
- Lengths: 2' to 8'
- Depth: 5-1/4"
- High Output Rugged Flat Top Cover
- Up to 3 tiers for higher output
- Standard with Top Outlet; Front and Top/Front Outlet options
- Aluminum Grill option
- Decorator Colors Available Upon Request
- Ideal for use with High Efficiency Boilers
- Choice of 6 commercial copper or steel elements
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Fine / Line 30
Fine / Line 30- Residential Hot Water
- Output: 580 Btuh/FT (180 deg. 1 GPM)
- Height: 7-7/8", Depth: 2-11/16" Lengths: 2' - 14'
- Made in the USA by the leader in baseboard heating
- Rust-resistent, galvanized steel enclosures with nu-white enamal finish maintains beauty
- Commercial grade material at residential cost
- Designed for single homes, apartments and renovations
- Optional swedged element tubes (available in 1/2" or 3/4") facilitate joining sections
- Industry’s best high strength support brackets & no-noise expansion cradles
- Accommodates return line with short radius return bend
- Drawn steel end caps and wall trim provide a distinguished look
- 1-3/4" floor-to-front cover opening promotes good air circulation for effective convection heating
- Fully modulating, pivot mounted damper helps control individual room temperatures
- Extendable accessories for wall-to-wall fit with no cutting makes a neat installed appearance
- Easy to open zip-strip cartons
- Shipped fully assembled for fast, easy installation
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HD Series
HD Series- Material: 16-ga. steel front cover, 20-ga. back panel
- Heights: 8-1/2" (one tier) & 14" (two tier)
- Depth: 3-1/2"
- Lengths: 2' - 8'
- Heavy gauge enclosure and support brackets
- Cover secures together with screws at each bracket location
- 3/4", 1" and 1-1/4" copper/aluminum elements permit higher flow rates, longer series-loop runs and lower pump loads where required
- 1-1/4" all-steel element, for use in one or two pipe steam systems
- Factory pre-assembled in individual cartons for rapid installations
- Finish: Galvanized is standard. Available in baked enamel
- Custom color available on special order
- Telescopic cover accessories
- Accessories have a screw hole to secure accessories to front cover
- Pan head screws supplied by others
- The picture on the right is an HD-850 installation in the Milwaukee Airport baggage claim area. This installation was done years ago. It is installed right by the cart area and receives a lot of abuse. Please note other than some paint damage it is in great shape. Seeing is believing, This is indeed “Tough Stuff” and it would be tough finding a higher abuse area to install it in.
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Multi / Pak 80
Multi / Pak 80- Res. and light comm.
- Hot Water or Steam
- 590 to 790 Btuh/FT (180 Deg. 1 GPM)
- Height: 8-7/8", Depth: 3-1/2"     Lengths: 2' - 14'
- Made in the USA by the leader in baseboard heating
- Designed for single homes and renovations and light commercial applications
- Fully modulating, pivot mounted damper helps control individual room temperatures
- Neat fitting accessories stay in place to help maintain beautiful appearance
- Optional Flared element tubes (available in 1/2" or 3/4") facilitate joining sections
- Industry’s best high strength support brackets & no-noise expansion cradles
- 2" floor-to-front cover opening promotes good air circulation for effective convection heating
- Extendable accessories for wall-to-wall fit with no cutting makes a neat installed appearance
- Easy to open zip-strip cartons
- Shipped fully assembled for fast, easy installation
- Fuel: Oil Fired
- System: Hot Water
- Combustion: Atmospheric
- Capacity: 105-231 MBH
- Up to 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
- The Q3 is DOE 2021 compliant
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.


