Dunkirk Quantum 90 Boilers | FurnaceCompare®

Dunkirk Quantum 90 Boiler Overview

The Dunkirk Quantum 90 boiler is a currently produced unit that comes in two series: the Q-90-100 and Q-90-200 series. These boilers are gas-fired, either natural gas or propane. The Q-90 boilers achieve a 90-percent AFUE rating. The Q-90 series are condensing boilers, and feature a cast-aluminum heat exchanger. The units are designed with sealed combustion and direct-venting, drawing air from the outside instead of from inside the residence. Each series offers various capacity hot water boilers, and all are Energy Star-rated.

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Consumer Reviews of Dunkirk Quantum 90


  • Very Satisfied
  • Somewhat Satisfied
  • Neutral
  • Somewhat Unsatisfied
  • Very Unsatisfied
  • #1 of 6 Dunkirk Boiler
  • 20% of customers recommended

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Dunkirk Quantum 90 Boiler Reviews

Showing 1-5 of 15 reviews

"Don't buy this junk!"

1.0 rating
Very Unsatisfied

This thing is junk — over the past 18 years it has died several times, required several new igniters, is noisy, and not worth the money. Stay away!

T. Guerrant

Laurel, MD

"HEAT EXCHANGER LEAK after 8 yr service"

1.0 rating
Very Unsatisfied

Heat exchanger is aluminum and started leaking after 8 yr. Pinhole leak but enough to be a problem and have to replace. Part covered by warranty but installation/replacement cost $900. Dunkirk warranty only covers parts not the replacement labor. Boiler before this one lasted 20 yrs and was not Dunkirk. Do not waste money on this boiler. This is common problem with Dunkirk.

Beth Parker

Hilton, NY


1.0 rating
Very Unsatisfied

I have a lot of downtime with this boiler. 7 igniters, 4 zone valves, 3 pumps, 4 boiler technicians. No help from Dunkirk. Out thousands of dollars. 848–333-5707 John M. If anyone wants to take class action.


New Jersey

"Avoid this product"

1.0 rating
Very Unsatisfied

Avoid this product. I had to change the igniter 3 times since installation, $265 each time. Today we found water in the basement and identified 3 cracks in the cast aluminum. The installer is out of business, I can't get Dunkirk to honor replacement. Run away!

vin palms

Newfoundland, PA

"Dependable boiler"

4.0 rating
Somewhat Satisfied

The boiler I currently own I have had within my household for at least 8 years. It has been a decent purchase overall, but does have its positives and negatives. I like the boiler because it was easy to install and hook up was really quick. It does its job for the most part, getting the water nice and hot for showers when needed. Something that happens which is a large dislike is it has to be reset as the water will come out cold forcing the owner having to do the pilot light over. Once you get the pilot light going you can get a nice hot and comfortable shower. Besides the pilot light issue the entire boiler is pretty small and user friendly. We have not had to do any repairs to it, but are clearly thinking about installing a new pilot light. This is after 8 years and I would anticipate it taking no more than an hour to complete the task. I probably would not buy this model and not recommend it because of the pilot light issue. The problem is inconvenient at times, when one is rushing in the morning to learn there is no hot water to shower with. Overall, not bad for the price and hoping it will last a very long time!

Wappingers Falls, NY

Other Quantum 90 Reviews

A thread on the forum heatinghelp.com reveals a homeowner having problems with his Dunkirk Q-90 boiler turning off for no reason. One contractor defends the brand, and a Dunkirk representative even responds to the complaint. The homeowner concludes by saying that his HVAC company no longer installs the Dunkirk brand due to several problems. The original poster on the forum actually writes for several years about how the Q-90 boiler shuts off at random. The experts conclude that a professional should be consulted.

Hvac-talk.com contains a post comparing a Carrier boiler and a Weil-McLean boiler. An expert on the forum explains that the Carrier boiler is actually the Dunkirk Q-90. The contractors on the forum say that the Carrier may not be worth the extra cost as compared to the Weil-McLean, although the Carrier is more efficient.

A homeowner asks on gardenweb.com about the cost of a high-efficiency boiler such as the Dunkirk Q-90 versus a lower-efficiency boiler that costs thousands less. An expert responds that the higher-efficiency boilers save money in operation, so selection should depend on how long the homeowner plans to stay in the home.

DUNKIRK Quantum 90 Model Numbers

The Quantum 90 is available in different models which vary in efficiency and capacity.

Model Number AFUE BTUs per Hour
Q90-100 90 100000
Q90-200 89.6 200000
Q90-50 90 50000
Q90-75 90 75000

Quantum 90 Warranty

Dunkirk offers a limited warranty for all parts in the Q-90 boiler for the first year. A limited warranty for the heat exchanger only is provided for years two through ten. The heat exchanger continues to be covered in a pro-rated fashion through year 15. The company does not require warranty registration, although it is recommended.

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