
Serving Harwinton, CT and surrounding areas
Approved (Corporate)
In business since 1946
Free estimates
Emergency services offered
"Outstanding service and professional installation!!"





+6

*The Angi rating for Boiler Installation companies in Harwinton, CT is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Boiler Installation needs.
*The HomeAdvisor rating for Boiler Installation companies in Harwinton, CT is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Boiler Installation needs.
Last update on March 12, 2026

Serving Harwinton, CT and surrounding areas
Approved (Corporate)
In business since 1946
Free estimates
Emergency services offered
"Outstanding service and professional installation!!"





+6

Serving Harwinton, CT and surrounding areas
Approved
In business since 2001
Free estimates
Emergency services offered
"Outstanding service. I called because my boiler was leaking and the after hours technician responded within 30 minutes of our call. Our coil plate and gasket were rotted and bolts had snapped and we decided that we would replace the boiler because ours was 16 years old. We spoke with the owner and sales manager the following morning and were told that they would be happy to replace the boiler if that is what we wanted to do but they felt our boiler could be repaired at a fraction of the cost and no where near the end of it's usable life. So we decided to go for the repair and they were right, it worked like a charm! So instead of a $9,000 boiler and indirect replacement, we spent $472 and my boiler was up and running the next day. We have used Advanced Mechanical Services for our conversion from oil to natural gas and for our air conditioning installation. They have always been very professional, courteous, prompt and their pricing has always been competitive. I would highly recommend them."

Serving Harwinton, CT and surrounding areas
Approved
Super Service Award Winner
In business since 2008
Free estimates
Emergency services offered
"The boiler installation job was done great. I even accepted an annual service plan to keep up with proper maintenance. They are wonderful to work with."





+22

Serving Harwinton, CT and surrounding areas
Approved
In business since 2004
Free estimates
Emergency services offered
"I needed quick service on a 45 year old hot water boiler in a 1938 house I recently purchased. While I could get the pilot light lit, nothing I did could get the boiler to fire (water was circulating).
On Wednesday I contacted Pelletier Mechanical as Gary (the owner) had been out giving me estimates on the various repairs and modifications I wanted to make. While Gary was out of the office training (again), Laura his admin arranged for Bill to come out on Friday. She provided an estimated cost (right on) and a 2 hour window.
Bill showed up on time and after a brief discussion get right to work. Bill spent about 15 mins. systematically determining why the flame would not light. He discovered that there the gas was not making it to the main control valve. He reset the safety shut off valve and the problem was solved. He then checked all the radiators to make sure that hot water was making it through out the house. After we determined that the upstairs radiators were not getting hot, Bill checked the water pressure and determined that the pressure was insufficient to fill the upstairs radiators in "real time". He suggested that the culprit was the 45 year old water valve and pressure release valve which being cast iron tend to corrode and clog in time. He proposed a replacement solution and priced it out, and offered to pick up the parts and replace the valves that afternoon. I decided to wait a few weeks so I could consider replacing the entire boiler.
While we were waiting on the boiler to come up to heat, Bill and I walked through the basement looking at the existing plumbing, tracing the water flow path and discussing the possibility of replacing the hot water tank with a tankless unit. (The hot water run is about 60-65 feet from HW tank to kitchen, bathrooms, etc.) Bill, like Gary, is knowledgeable and informative.
I will have Pelletier Mechanical back to do more work on the house."





+1

Serving Harwinton, CT and surrounding areas
Approved
In business since 1994
Free estimates
Emergency services offered
"Installed arrived on time and worked efficiently until job was successfully completed. They cleaned area when they finished."





+5

Serving Harwinton, CT and surrounding areas
Approved
In business since 2022
Credit card accepted
Offers commercial services
"They have replace my last to HVAC companies!"

Serving Harwinton, CT and surrounding areas
Approved
In business since 1999
Free estimates
Credit card accepted
"Very positive experience. They responded immediately when I sent the request. The gentleman who called asked me questions about my current setup and had a technician out promptly. The quote was reasonable and the job was completed in one day. Staff were friendly. Happy customer!"





+9

Serving Harwinton, CT and surrounding areas
In business since 1992
Free estimates
Emergency services offered
"HARP sent a rep to the house, he did the evaluation for sizing, which was in line with the sizing tools I used. The solution he offered was just about what I had picked out, and I went with his recommendation. The install went fine. They did have to be reminded to retape some ducts, but we're happy to take care of it."





+9

Serving Harwinton, CT and surrounding areas
In business since 1935
Emergency services offered
Credit card accepted
"Technician arrived on time. He was extremely pleasant, professional and informative about the servicing. Would recommend him/Wesson Energy to anybody."




Serving Harwinton, CT and surrounding areas
In business since 1995
Free estimates
Emergency services offered
"After my initial call, representative Pat came to see exactly what we wanted done. Since we did not know all their options he suggested that the owner Mike come to discuss all the Heating and Air conditioning options for us and the prices. Mike came and we decided on the mini splits because they were easy to install with only 3 days of disruption to our normal living schedule and they were far less expensive to either hot water heat, which require installing copper pipes in every room and a plumber to do the work and a duct system of delivering forced hot air to all the rooms with an oil furnace.
We asked that the work start on the 15th of July and it did. Mike thought it could take three days since the daily temperature was in the 90's but they completed it in two days and left everything clean and orderly. They did have to cut down some of our foundation plants to make room for the condensers which sit on the ground.
The tubes from the mini splits are run through the walls to the condensers outside and covered with a tube that looks like a gutter drain. These are on two sides of the house and do look a bit unorthodox on my rough sawn cedar home but I will get use to them or paint them to match the grey stain on the house. This is why I rated Quality only good for I have no idea how all these materials rate to other systems and how they will hold up. Time will tell.
We were able to use them immediately when the installation was completed on the 16th for air conditioning. Since they work on the same system for heat we only have to change the mode on the remote to Heat and it starts heating the house instead of cooling it.
I had no idea what a heating and AC installation would cost so I think it is a bit expensive but I have learned it is far cheaper than other systems especially since my house was built in 1976 with electric baseboard heating which cost a fortune to run in the winter since two upstairs rooms have 18 foot high ceilings. I have been told this new system will save at least 40 to 50% on electric costs. I will be keeping track immediately to see if this is true now with the AC system. If it does I will change my price rating to excellent.
"



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

The average boiler installation cost depends on size, system type, and other factors. Keep reading to learn the cost of a new boiler.

Discover the average electric boiler installation cost, key price factors, and ways to save. Get transparent, expert-backed estimates for your project.

Get the facts on propane boiler installation costs. Learn what impacts your price, compare options, and budget confidently for your home upgrade.

Looking for a qualified boiler installation pro? Learn how to find and hire the right professional, from credentials to questions to ask.

Installing a boiler requires care and precaution. Use this checklist to install a boiler safely.

Installing a boiler DIY isn’t recommended without the proper skills and experience. Learn how to safely install a boiler in this guide.