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Best boiler installation pros near Cornwall, CT

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  • Average homeowner rating star icon4.2
    Average homeowner rating
  • Verified reviews icon94
    Verified boiler installation services reviews

Top-Rated Boiler installation pros in Cornwall - Updated Nov 2026

Avatar for J Thurston Fuel
J Thurston Fuel
5.0(
4
)
Boiler or Radiator Heating System - Install or ReplaceGas Boiler or Radiator Heating System - InstallOil Boiler or Radiator Heating System - Install

Serving Cornwall, CT and surrounding areas

Approved

In business since 1999

Free estimates

Credit card accepted

"We hired thurston to power wash our house. The job took about 3 hours. They did a fantastic job! They power washed and scrubbed the house deck and even the driveway and sidewalk as well as the roof. Their attention to detail was outstanding! The siding looked like new, the deck was spotless , just a great job. Based on their work power washing our house I would definitely not only recommend them to power wash your house but I highly recommend them to do other jobs which I intend to do. This company definitely cares about delivering quality work to their customers. job title was not available in list so it was just chosen randomly. Actual job was power washing."
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+9

9 neighbors recently requested a quote
Recommended by75%of homeowners
Avatar for Wesson Energy Inc
Wesson Energy Inc
4.5(
32
)
Boiler or Radiator Heating System - Install or ReplaceElectric Boiler or Radiator Heating System - InstallGas Boiler or Radiator Heating System - Install+3 more

Serving Cornwall, CT and surrounding areas

In business since 1935

Emergency services offered

Credit card accepted

"The guys that came out to do our home energy audit where very professional.  They gave me an overall explanation of what they would be doing and as they did their work they updated me regularly as to what they where about to do next as they completed each part.   They found my boiler was a bit out of spec on the amount of CO2 it was producing and I suggested i have it looked at.  I took them up on getting one of their maintance teams over to look at it and to my surprise they where able to be here before the Home energy audit guys left so they where able to explain what they found face to face.  It turned out to be nothing major just a bent piece of metal a little to close to the flame cause a lose of efficient burn.
"
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Recommended by90%of homeowners
Avatar for Aire Serv of Western Connecticut
Aire Serv of Western Connecticut
4.7(
27
)
Boiler or Radiator Heating System - Install or ReplaceElectric Boiler or Radiator Heating System - InstallGas Boiler or Radiator Heating System - Install+3 more

Serving Cornwall, CT and surrounding areas

In business since 1995

Free estimates

Emergency services offered

"We had a Burnham boiler that developed a crack (apparently they are notorious for doing so). It was spewing water all over our basement every time it turned on. Mike came over promptly and assessed the situation, giving us several options. We could have gone with a less expensive boiler, but chose a higher efficiency one as well as a new hot water tank (since ours was about 14 years old) and new connections. The installation took all day and into the evening with Mike and his partner working virtually non-stop. He also vacuumed up five gallons of water from our basement. We felt Mike was very professional as well as pleasant and honest to deal with. The new furnace has been in for a few days and is very quiet. He has estimated a savings of about $900 a year in oil costs with the new system.
"
Tech with AS van
Tech using the shoe covers
Tech at indoor unit
Recommended by96%of homeowners
JCO Plumbing and Heating - Home Facebook
5.0(
6
)
Electric Boiler or Radiator Heating System - InstallOil Boiler or Radiator Heating System - Install

Serving Cornwall, CT and surrounding areas

In business since 2016

Free estimates

Credit card accepted

JCO Plumbing and Heating is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers interests and make their concerns the basis of our business. \n

Faucet
Shower valve
Vents
Boiler header
Urinal

+12

Response time1 day
Recommended by100%of homeowners
Avatar for NEW ENGLAND SMART ENERGY
NEW ENGLAND SMART ENERGY
4.9(
13
)
Boiler or Radiator Heating System - Install or ReplaceElectric Boiler or Radiator Heating System - InstallGas Boiler or Radiator Heating System - Install+3 more

Serving Cornwall, CT and surrounding areas

In business since 2009

Emergency services offered

"Not the best, but I guess not the worst either.
They did the door blower test which revealed different air leaks in the house. They sealed around some of the doors in the home, installed some door sweeps, caulked around baseboard registers etc. However, the work was far from consistent and less than professional in quality.
There are 15 registers / returns in the home and we were told they would caulk around them all, they caulked around 7. 2 of which the caulking was so thin that it cracked before the next morning.
There are 3 sinks in the house where pipes were supposedly "foamed and insulated" on their report. There is no additional insulation visible anywhere that I can see.
We are entitle up to 40 CFL light bulbs in the home, however, even the 30 they said they changed were not completed.
For example:
-there are 2 nightstand lamps in the bedroom. One lamp received a CFL and the other wasn't touched.
-there is a hallway ceiling light that was supposed to be changed out with CFLs, but still has the same old bulbs.
-downstairs bathroom still has all three original bulbs
-two bedroom ceiling fans that take regular "A" type bulbs all have the same bulbs
I sent an email to the gentlemen who came out to the house asking if we could at least receive the extra bulbs. He did respond and said yes, but never got back in touch with me. After the general overall experience I did not bother chasing after them for a few more dollars worth of bulbs. However, the whole point is not the money, its the fact that these were all listed on the report and not completed accordingly.
They did recommend an insulation company to come in and give us a quote and also told us about different programs offered from the state which would allow us access to rebates for making home energy improvements. All in all, I guess it helped us to know where the air leaks were in the house, but the overall performance of the team was simply sub-par. They were nice, polite and somewhat informative but by no means "wowed" me.
"
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NESEG Certified Techs
Blower Door Test

+38

Recommended by91%of homeowners
Avatar for North Alabama Technical Services
North Alabama Technical Services
4.9(
124
)
Boiler or Radiator Heating System - Install or ReplaceElectric Boiler or Radiator Heating System - InstallGas Boiler or Radiator Heating System - Install+3 more

Serving Cornwall, CT and surrounding areas

In business since 2010

Emergency services offered

Credit card accepted

"We own a home-based business which relies heavily on our computers operating efficiently. We have had a service contract with another computer repair business for several years. Recently when we were having problems with our computers, we tried contacting our service contractor multiple times. He never responded. Feeling frustrated, I contacted James at North Alabama Technical Services and explained our situation. He instantly came to our rescue. He "cleaned-up" our computers and took care of all the problems we were experiencing. He went above and beyond to help us in our dire time of need. We would strongly recommend James and his company for computer service needs. We have now retained him on a service contract and are looking forward to working with him in the future."
2014 Super Service Award Winner!
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Recommended by97%of homeowners
Thomaston Comfort Control, Inc.
3.8(
66
)
Gas Boiler or Radiator Heating System - InstallGas Boiler or Radiator Heating System - Install - For BusinessOil Boiler or Radiator Heating System - Install+1 more

Serving Cornwall, CT and surrounding areas

In business since 1986

Free estimates

Warranties offered

"Very responsive to questions all along the project. Brought in installer to pre-check and make sure plan would work. Very respectful of property and very timely completion of project. I recommend this company!"
Combi Install
Heat Pump A/C Install
Boiler Indirect Install
Response time6 days
Recommended by95%of homeowners
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Install Boiler FAQs, answered by experts

Installing a boiler requires training, a specific skill set, and extensive experience. Boiler installation can be extremely dangerous, as it involves working with water lines, gas lines, and electricity. For this reason, it’s strongly recommended that you hire a professional to install your boiler. Some states even consider it illegal to work on a boiler without the proper licensing.

Boilers provide even heating, energy efficiency, and a quiet operation compared to forced air systems.

Most installations take 2-5 days, including old system removal and setup.

In some cases, conversion kits are available, but not all boilers are compatible. Conversion may require significant modifications and should only be performed by a qualified professional. Before making a decision, compare conversion costs to the cost of a complete replacement to determine the most cost-effective and reliable option for your home.

Generally, an oil furnace is considered safer than a gas furnace for several reasons. While both types of furnaces can produce carbon monoxide, a leak in an oil furnace is easier to detect due to the smell. Oil furnaces also don't connect to a gas pipeline, which reduces the chance of a fuel leak. Most importantly, heating oil is not combustible, whereas natural gas is highly flammable. This means there is a much lower risk of combustion or explosion with an oil furnace. However, an oil furnace can still pose a fire hazard if it tips over.

The Cornwall, CT homeowners’ guide to boiler installation services

From average costs to expert advice, get all the answers you need to get your job done.