DXL Series

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DXL Series

Dunkirk’s DXL Series of gas-fired hot-water boilers have an advanced Fuel Smart Hydrostat Control and offers up to 83.5% AFUE. 

Energy saving features include the electronic ignition system and motorized vent damper to reduce your heating costs.

 Exceptional Heat Exchanger Design

  • Features a dependable cast iron heat exchanger with cast iron push nipple connections. The sections and push nipples expand at the same rate when heated. By using similar materials instead of less expensive gaskets the boiler maintains a water-tight seal.

Advanced Fuel Smart Hydrostat Control

  • Features digital display and diagnostics
  • Adjusts the water temperature based on your heating system demand which further reduces your heating costs
  • Built-in low water cut-off (LWCO) to protect the boiler from potentially dangerous low water conditions

Integral Draft Diverter

  • Features factory installed integrated draft hood diverter, which reduces the risk of improper draft hood installation and unsafe CO levels
  • Low profile reduces installation height by up to 30” as compared to models with an external draft diverter hood

 The DXL also features a Cast to Last 20 Year Non-Prorated Warranty.

NOTE:  DXL with recessed control available while supplies last. 
DXL 3200-PLUS with external control is replacing the previous version.





  • Efficiency: Mid-Efficiency
  • Capacity: 50 - 75 - 100 - 125 - 150 - 170 - 200 MBH
  • Heat Exchanger: Cast Iron
  • Combustion: Atmospheric
  • Venting: Chimney Vent
  • Boiler Type: Hot Water
  • Boiler Control Module: Fuel Smart Hydrostat Temperature Limit, LWCO and Boiler Reset Control with Circulator Relay and Domestic Hot Water Input Override.
  • User Display Interface: Temperature LED display with dial-type settings and diagnostic indicator lights.
  • Heat Exchanger: Cast Iron Sections with Cast Iron Push Nipples
  • Combustion: Completely Installed and Wired Gas Control System with Burners and Manifold consisting of Stainless Steel Burners, Automatic Redundant Combination Gas Valve, 24 Volt Intermittent Pilot Control, Continuous Retry 100% Shut-Off, Combination Pilot Burner/Electrode/Sensor.
  • Electrical: 24v Transformer
  • Safety: Flame Roll-Out Safety Shut-Off and Manual Reset Blocked Vent Safety Shut-Off.
  • Other
    • Boiler Jacket
    • Integral Draft Diverter
    • Combination Temperature/Pressure Gauge
    • Circulator Pump
    • 3/4" Drain Valve
    • ASME Relief Valve


  • Central Heating Pump (Taco, Grundfos, or Less Pump)
  • LP Conversion Kit
  • Fill-Trol

Documents / Resources

Product Testimonials

  • I have had a lot of problems with it , first we converted it to LP and had problems with no air adjustment , we called you you said tape or make air adjustment covers , they know they have a problem and should come with air adjustments, The unit has gone into lock out numerous times , i caught it today , the gas valve isnt shutting down, and leaving the pilot on and as long as the pilot is on it wont fire.

    I called today, and they are checking on it for me.

    Leroy's Heating
    Circleville, OH
  • Good product. Good value. 

    Easy Installation process.

    Roger Wolfanger
    Avon, NY
  • Yes I recommend, because of the quality and efficiency of the boiler. I had a Dunkirk boiler installed in 1993, and it performed well, and we experienced NO service calls. That's 27 years of trouble-free operation. This new boiler is even better because it runs much more quietly than the previous one. In the first one, we could hear the water actually gurgling as it was coming up to temperature. There is none of that in this new model.

    John A. Oaks
    Burr Ridge, Il
  • Absolutely would recommend.  The unit is so quiet & is operating efficiently.

    Jerald S Becker
    Union Pier, MI
  • Very Satisfied.

    Rick Watkins
    Bay City, MI
  • His knowledge of your products was incredible and I would absolutely recommend. He showed me the details, durability, things like that very important as our business and homeowner I want the best, that way I don’t have a lot of repairs.  thank you for your excellence your time and care Of making good quality dependable items.

    Tracey Nemet
    Stoughton, MA
  • So far the house has been warm throughout. It is also early in the year. Yes, at this time, I would recommend.

    We had to have a board and sensor replaced because the boiler was not working. Fond out the pump was installed upside down.

    Kathi Duriga
    North Huntingdon, PA
  • What I heard of it was all good.  Made in our hometown.

    Just a great boiler

    Gregory M Sek
    Dunkirk, NY
  • Overall seems to be reliable and has lowered our gas bill.

    Jessica Judd
    Wilmington, IL
  • Ease of Installation

    Owen King
    Biglerville, PA
  • I switched from aFuel Oil Boiler Furnace to a Propane boiler. I couldn't be happier. Its quiet and efficient.
    Ben Dever (Heating & Plumbing Services) did an excellent job installing and explaining the operation of the unit.

    Mark Maher
    Marcy, NY
  • They are well made and my furnace works fine.

    Robert Farischon
    Roaring Brook Township, PA
  • The stuff is good.

    Craig Adams
    West Springfield, PA
  • Easy to install boilers and they work very well.

    Taylor Jensen
    Belding, MI
  • The boiler that was replaced lasted 50 years.  It took the test of time.  Sometime new is not better.

    Fred Lentz
    Dunkirk, NY
  • It seems to be working fine and is well made with strong couplers.

    Eleanore Livesey
    Chappaqua, NY
  • Very satisfied with the overall experience.

    Richard Meyer
    Marseilles, IL
  • Love Customer Service.

    Golden West Plumbing
    Aurora, CO
  • The boiler was much more than I expected for the value.  Very easy to install by the contractor.

    Frank Lamberti
    Marlboro, NJ
  • Good quality (Made in the USA), improved performance and technology over our 35 year old unit.

    Casale Plumbing and Heating did an outstanding job installing the new boiler.  They were very professional in every aspect of the installation.  The piping and electrical work was carefully and neatly completed.  New zone valves were also installed.  Our 3 Honeywell Wi-Fi thermostats work great with the new boiler.  Very pleased with the whole process.

    Edward Stegle
    Dunkirk, NY
  • Efficient and easy to maintain.

    Kevin Kendra
    Mountaintop PA
  • Very Satisfied.

    Wilkes Barre, PA
  • Reliable and long lasting

    Timm Heating & A/C Inc.
    Lake View, NY
  • I was actually the technician who installed the unit. Having worked on boilers for more than 30 years I was very pleased with the ease of install for this unit. I also liked the placement of the domestic coil on the side of the unit that keeps the water lines out of the way of heating loop. I will definitely recommend Dunkirk to future clients. Individuals who unit was installed for were extremely happy with it.

    Central Penn Plumbing Services
    Dillsburg, PA
  • Unit was in stock, knowledgeable sales & installation staff. Product replaced a Peerless boiler that was problematic. Unit was packaged nicely, was easy to maneuver into place and simple to install and run off.

    Painted Post. NY
  • It's energy efficient and it provides adequate heating throughout the home

    Brooklyn, NY
  • I've been putting dunkirk boilers in my apartments for a long time with very few problems.

    Newfane, NY
  • I was really impressed with the new technology in the control board

    Frederick, MD
  • Easy install of a great product. Wiring diagram was very helpful and made for a better quicker install.

    East Providence, RI
  • Ease of installation

    Arlington, VA
  • Quality unit for the price. Very easy to install

    Baltimore, MD
  • Impressed with the product!!!

    Leroy's Heating and Cooling
    Circleville, OH
  • It was packaged very well so no damage when it was brought in. Nice color so when it gets older it will still look good!! Quiet running and the energy features on this boiler this is great

    Lake View, NY

    Channahon, IL
  • very satisfied with product

    Tonawanda, NY
  • Very good quality at economical price. Keep up the good work.

    Sauquoit, NY
  • The last boiler this one replaced was a Dunkirk that lasted almost 45 years!

    Lockport, NY
  • Product was equivalent of much higher priced units at a much lower price

    Mantua, NJ
  • Very quality unit. Very quiet and works very well.

    Bellevue, OH
  • This is my second house and second Dunkirk boiler unit. First one worked like a champ. Nice and compact and love the electric damper and LED temperature read out.

    Erie, PA
  • this may sound crazy but its a beautiful boiler. Much more efficient than my old heater. Used heater for first time since change of weather & works perfectly.

    Atlantic City, NJ
  • Yes, I have previous Dunkirk boilers. Giving me peace of mind when we travel out of town.

    William Zaborowski, Homeowner
    Newark, NY