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Best boiler installation pros near Old Saybrook, CT

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    Average homeowner rating
  • Verified reviews icon438
    Verified boiler installation services reviews

Top-Rated Boiler installation pros in Old Saybrook - Updated Nov 2026

Avatar for Cawiamca Heating, Cooling, and Electrical
Cawiamca Heating, Cooling, and Electrical
5.0(
96
)
Boiler or Radiator Heating System - Install or ReplaceElectric Boiler or Radiator Heating System - InstallGas Boiler or Radiator Heating System - Install+3 more

Serving Old Saybrook, CT and surrounding areas

Approved

Super Service Award Winner

In business since 2014

Free estimates

Emergency services offered

"CAWIAMCA did an outstanding job installing 2 high efficiency ductless mini splits – 1 at each end of my house. The owners Ron and Jeremy worked with me patiently on the system sizing and selection process, rebates from my power company, income tax credits, etc. Everyone on the installation crew was polite, conscientious, and knowledgeable. They came back next day to complete the installation of the second system despite snow and freezing rain!!! This company is well equipped to do the job efficiently. CAWIAMCA's price was much lower than the other 2 contractors I got estimates from (who planned to use concrete blocks to support the outdoor condensers). CAWIAMCA used quality steel bases with tall legs to support the condensers and keep them higher up away from snow, leaves, mice, etc. Nice looking installation. I could not be happier with a company. :-) CAWIAMCA!!!"
Variable Refrigerant Flow Cold Weather Heat Pump in East Lyme
VRF Cold Weather Heat Pump in Groton
Additional Photos
Additional Photos
Response time8 hrs
30 neighbors recently requested a quote
Recommended by92%of homeowners
Avatar for Atlantic Water Heater Pros
Atlantic Water Heater Pros
4.8(
51
)
Gas Boiler or Radiator Heating System - Install

Serving Old Saybrook, CT and surrounding areas

Approved

In business since 1998

Free estimates

Emergency services offered

"Williams & Associates replaced an ancient, very large old boiler in my very large house. Bruce calculated the necessary size and found a suitable boiler. He and his crew thoroughly cleared the radiators and lines before removing the old boiler and installing the new one. They checked all the radiators and added new valves as needed during a lengthy checkout. It took several days to do all the work. Throughout, Bruce explained what they were doing and why as well as recommending changes/additions to the original proposal. They were even cheerful about removing the original "Mary Jane" from the basement. I would definitely recommend them to anyone using steam heat. Great job!"
Large Mechanical Room
Response time1 day
1 neighbors recently requested a quote
Recommended by92%of homeowners
Avatar for Cawiamca, LLC
Cawiamca, LLC
5.0(
43
)
Gas Boiler or Radiator Heating System - InstallGas Boiler or Radiator Heating System - Install - For BusinessOil Boiler or Radiator Heating System - Install+1 more

Serving Old Saybrook, CT and surrounding areas

Approved

In business since 2014

Free estimates

Emergency services offered

"Jeremy came the evening of the day I called him accommodating my schedule. It wasn't even an emergency, at least I didn't think it was. I called for a cleaning but he immediately identified a problem I didn't know I had. He walked me through the diagnostic, described and demonstrated the problem, quoted the job and when I accepted it he performed the repair. When he left my boiler was working efficiently. The boiler was working but the heated water wasn't circulating through the baseboard. I was constantly burning oil with minimal effect. It had felt drafty in the house and I was relying largely on a gas fireplace to take the chill out of the air. That's no longer the case, the house is warm. He's coming to clean the boiler Wednesday evening. I will never hire anyone but Jeremy again to maintain my boiler."
Steam Boiler
New Boiler Install
New Home Saybrook
Custom built in in progress
Addition in progress

+2

Response time4 hrs
Recommended by100%of homeowners
Select Mechanical Services, Inc.
4.5(
58
)
Oil Boiler or Radiator Heating System - InstallElectric Boiler or Radiator Heating System - InstallGas Boiler or Radiator Heating System - Install+2 more

Serving Old Saybrook, CT and surrounding areas

Approved

In business since 2014

Emergency services offered

Credit card accepted

"Furnace boiler would not start. Appointment was available the next day. Eric diagnosed faulty gas valve. Part was back ordered so took extra days. He replaced gas valve and furnace started but it did not start the next cold day. Turned out he should also have replaced the thermocouple. He came the same day when I called and was able to complete the repair at no additional charge. They stood behind their work and are a high quality firm but repair in one visit would have been better. Eric was very pleasant and professional and readily acknowledged his misjudgment."
Response time1 day
90 neighbors recently requested a quote
Recommended by90%of homeowners
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Install Boiler FAQs, answered by experts

If you go to turn it counterclockwise and it won’t turn anymore, it’s open. Like most other valves, you should be able to turn a radiator valve counterclockwise (to the left) to open it and clockwise (right) to close it. To close a radiator valve, turn it clockwise until you meet some resistance and can’t turn anymore, but do so carefully to avoid breaking the valve.

The right type of HVAC system will depend on several factors, including your climate, budget, preferences, and existing HVAC setup. For example, if you live in an area that experiences extreme weather, then a split system would likely be the best option. Or, if budget is a concern, consider installing a ductless system in just one room.

The main difference between an outdoor wood furnace versus an outdoor wood boiler is what each appliance is heating. An outdoor wood furnace burns wood to create heat, which warms the air and moves it through the ducts in your home. An outdoor wood boiler uses the heat from burning wood to warm water, which goes through pipes to radiators in the home.

On average, you’ll need about two gallons of oil per day to heat your house when it’s 50 degrees Fahrenheit outside. Most oil tank capacity is about 275 gallons, and heating your house with two gallons of oil per day will last about four and a half months. This consumption will vary depending on the climate and average temperature in your location. For example, if the winters are longer and colder where you live, you’ll probably need to refill your oil tank at least once to get through the winter.

Yes, you can build a sunroom addition to your home despite living in a cold climate. Make sure to use high-quality insulation and windows and to supplement with sufficient heating from your HVAC system. The windows in the sunroom allow enough natural light into the room to help heat it most times without having to use the furnace. Even a small electric fireplace can heat the sunroom well enough.

The Old Saybrook, CT homeowners’ guide to boiler installation services

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