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Best boiler installation pros near Washington, NH

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TRUSTED BY WASHINGTON, NH HOMEOWNERS

  • Average homeowner rating star icon4.3
    Average homeowner rating
  • Verified reviews icon100
    Verified boiler installation services reviews

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

Avatar for Action Plumbing Heating And Air
Action Plumbing Heating And Air
4.9(
92
)
Oil Boiler or Radiator Heating System - InstallGas Boiler or Radiator Heating System - InstallGas Boiler or Radiator Heating System - Install - For Business+1 more

Serving Washington, NH and surrounding areas

Approved

In business since 2022

Free estimates

Emergency services offered

"Never having had to hire someone to fix my AC unit only to install it (and the company was not reputable), I had serious trust issues. Action was the only one to contact me of all the suggested companies. That made me even more suspicious! They were able to fit me in for the next day. Hmm, more hesitation. But I rested in Action's good reviews on HomeAdvisor and kept the appointment. I was so happy I did. Mike was fantastic. He was personable and extremely informative. He knows his AC and heat pumps really well. I look forward to having them back in a couple of weeks to clean my furnace and do some cleaning and troubleshooting on a Hearthstone gas fireplace. When one finds a company one can trust, well, stick with them and get what needs to be done, done. I am so happy to have done something so out of my nature, like trusting HomeAdvisor. Thank you, Action Plumbing, Heating, and Airconditioning!"
Response time1 day
Response rate89%
19 neighbors recently requested a quote
Avatar for East Coast Plumbing And Heating LLC
East Coast Plumbing And Heating LLC
5.0(
6
)
Oil Boiler or Radiator Heating System - InstallElectric Boiler or Radiator Heating System - Install

Serving Washington, NH and surrounding areas

Approved

In business since 2019

Free estimates

Credit card accepted

"East Coast Plumbing and Heating provided us with a great service on a big job of replacing our 30 years old furnace. Dylan was very accommodating and explained the process in a great detail. His estimate for the job was honest and fair. Dylan and his crew did the job in one day and did an excellent work for a reasonable price. We are very happy with this company and we will work with them in the future. I highly recommend East Coast Plumbing and Heating."
12 neighbors recently requested a quote
Avatar for Total Climate Control
Total Climate Control
3.4(
194
)
Gas Boiler or Radiator Heating System - InstallOil Boiler or Radiator Heating System - Install

Serving Washington, NH and surrounding areas

Approved

In business since 2008

Free estimates

Warranties offered

"I hired TCC three weeks ago to install a heat pump mini-split systems for my 4 BR home. Their quote was competitive, their install went as planned, and the technicians were super knowledgeable and worked hard to do it right. I am thrilled with the results. I have recommended them to family already and TCC will get more business."
Central AC
New Gas boiler
All new hydronics
All new hydronics
29 neighbors recently requested a quote
Recommended by86%of homeowners
Avatar for Coy Plumbing & Heating
Coy Plumbing & Heating
5.0(
8
)
Boiler or Radiator Heating System - Install or ReplaceElectric Boiler or Radiator Heating System - InstallGas Boiler or Radiator Heating System - Install+3 more

Serving Washington, NH and surrounding areas

In business since 2024

Free estimates

Emergency services offered

"We were very pleased with the communication and the outcome of our project. We have an old home with some older piping. Finding someone that works on steam boilers is tough. When they looked at the install, they explained what needed to happen clearly deand unrstandable."
Additional Photos
Additional Photos
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Additional Photos

+4

Response time2 days
Response rate100%
Recommended by87%of homeowners
Avatar for Triumph Heating and Cooling
Triumph Heating and Cooling
4.8(
29
)
Gas Boiler or Radiator Heating System - InstallGas Boiler or Radiator Heating System - Install - For BusinessOil Boiler or Radiator Heating System - Install+1 more

Serving Washington, NH and surrounding areas

In business since 2020

Free estimates

Emergency services offered

"Devin answered my distress call to a leaking boiler and Jake came out to fix the problem. It is my first boiler system so poor Jake got a lot of questions. He was FANTASTIC!! So professional and kind. Fixed the problem and answered all of my questions. He did not try to over sell me. I felt very comfortable with Jake's work! I am so pleased with the company all around that I signed up for the Care program and look forward to see them for annual maintenance. Thank you from the bottom of my heart Devin and Jake! William Rivera"
Rooftop Unit
Van
Ductwork
On Demand Boiler
Boiler

+26

Response time1 day
Recommended by80%of homeowners
Lake Sunapee Heating LLC
4.1(
30
)
Boiler or Radiator Heating System - Install or ReplaceElectric Boiler or Radiator Heating System - InstallGas Boiler or Radiator Heating System - Install+3 more

Serving Washington, NH and surrounding areas

In business since 1985

Free estimates

Emergency services offered

"The owner visited and provided an estimate in a timely manner and was very personable.  The estimate was very reasonable and the work began on time.  All workers were professional but it wasn't made clear most of the time, what time they could be expected to arrive on subsequent days after the start."
Recommended by88%of homeowners
Avatar for McGinley & Sons Heating & Air Conditioning
McGinley & Sons Heating & Air Conditioning
3.8(
244
)
Electric Boiler or Radiator Heating System - InstallOil Boiler or Radiator Heating System - Install

Serving Washington, NH and surrounding areas

In business since 2006

Free estimates

Emergency services offered

"Bill, his two sons, and two additional employees arrived on time and spent the entire day (approximately 11 hours) installing a new boiler as well as a new hot water tank, outside venting and a new oil line. Importantly, the crew was able to put both the boiler and hot water tank in a very confined area, thus eliminating having to use a portion of our basement that was designed (and being used) for storage. Though it's only been a week since the work was completed, everything is working properly and we anticipate that it will continue. As a result of the satisfaction we've experienced, I've already been asked to supply information referent to the company's workmanship, efficiency, proficiency, and cost to a good friend whose home is in need of boiler replacement."
Buderus Boiler/Indirect
 Air Handler M.Bedroom
 Air Handler Main floor
Response time1 day
Recommended by84%of homeowners
Avatar for Heath & Field Plumbing & Heating
Heath & Field Plumbing & Heating
4.8(
4
)
Boiler or Radiator Heating System - Install or ReplaceElectric Boiler or Radiator Heating System - InstallGas Boiler or Radiator Heating System - Install+3 more

Serving Washington, NH and surrounding areas

Free estimates

Emergency services offered

"The work was done neatly. It looks good. However, the plumber told me that condensation of this type can be acidic and we would need an alkaline filter. Because of circumstances we were in a hurry and had no time to discuss or verify this information. A previous contractor whom I called to ask about a new furnace told me he would add a simple pump and hose to the cost of the furnace for $60. The installed filter looks very sophisticated and I believe added a lot to the cost of the job. The invoice was not itemized. I neither asked for nor received a cost estimate of the work to be done. The work may be fairly priced and necessary. It seems excessive, but I did not investigate. The fault, if there is any, is partly mine."
Recommended by75%of homeowners
Showing 1-10 of 26
Install Boiler FAQs, answered by experts

It can take anywhere from four hours to three days to replace a boiler with a new one. How long your particular boiler installation takes will depend on whether you need a gas line installed and if you’re switching to a new boiler system. 

Replacing a combination boiler or standard boiler with the same system should only take four to six hours. Meanwhile, switching from a conventional boiler system to a combination boiler system could take a few days.

The best time to buy home heating oil is in the summer when the demand is lowest, as the prices are usually lower. However, waiting until the summer to buy is often unavoidable unless you install a separate storage tank. If you have the space for a second tank, you can expect to pay between $1,000 and $4,000 for the oil tank replacement or installation, depending on the capacity and location. You could quickly recuperate these costs, though, by stocking up on heating oil in the summer and avoiding deliveries in the winter when prices are highest.

The average cost to replace or install a new HVAC system is around $7,500. However, the price can range from $5,000 to $12,500, depending on factors like the size of your home, the type and brand of the unit, and your specific heating and cooling needs. If you only need to replace certain components, the cost will be lower; for example, a new AC unit can cost between $2,200 and $5,500, while a new furnace costs $3,200 to $6,000. If additional work like new ductwork is required, the total cost could be as high as $22,000. It's best to contact a local HVAC company for an accurate quote.

Many HVAC companies offer free quotes and free estimates for repairs and new HVAC systems. Others offer low-cost quotes or apply the cost of the estimates or diagnostics to your final bill if you hire them. Be aware that some companies advertise free HVAC quotes and recoup the costs by charging more for their services. Free HVAC quotes are never truly free—they cost the company time and effort—so be a good customer. Also understand that you may end up paying for free quotes in another way if you don’t hire a reputable company.

Most home boilers will need an expansion tank. That’s because these boilers are closed-loop systems, where the water is trapped. An expansion tank is needed when the boiler heats the water and it expands, allowing air to condense in the tank to make room for the water. Other types of boilers don’t use an expansion tank, such as traditional steam boilers, but these aren’t as common. And hot water tanks may be able to use a pressure release valve instead. When in doubt, call in a pro to take a look.

The Washington, NH homeowners’ guide to boiler installation services

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