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Best boiler installation pros near Alton, IL

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TRUSTED BY ALTON, IL HOMEOWNERS

  • Average homeowner rating star icon4.3
    Average homeowner rating
  • Verified reviews icon374
    Verified boiler installation services reviews

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

Tiger Plumbing, Heating, Air Conditioning, & Electrical Services
3.4(
357
)
Electric Boiler or Radiator Heating System - InstallGas Boiler or Radiator Heating System - Install

Serving Alton, IL and surrounding areas

Approved (Corporate)

In business since 1993

Free estimates

Emergency services offered

"I have used the company many times. Two technicians came out for the tuneup and completed the job in about 2 hours. The company has also replaced the furnace and AC in the past. They are very thorough and professional. The staff is also very friendly and available for service. I am a member of their club which makes them easily accessible to me."
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+5

293 neighbors recently requested a quote
Recommended by73%of homeowners
American Airtemp LLC
New to Angi
Gas Boiler or Radiator Heating System - Install - For Business

Serving Alton, IL and surrounding areas

Approved

In business since 2008

Credit card accepted

Offers commercial services

American Airtemp LLC 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

Response time10 mins
Response rate100%
Avatar for Triplett Mechanical Services
Triplett Mechanical Services
4.9(
35
)
Gas Boiler or Radiator Heating System - Install - For Business

Serving Alton, IL and surrounding areas

In business since 1995

Free estimates

Emergency services offered

At Triplett Mechanical Services, we have been satisfying customers HVAC needs for over 13 years. Although we are a small company, we are quick to respond, and very competitive in our pricing. The work we do in our chosen trade is extremely well done and our materials are of the highest quality as well. Perhaps the thing we are proudest of is our ability to have a clean work environment at all times. Naturally, our desire is to always completely meet or exceed your needs as a consumer. When you have HVAC needs, we can fix it and in a timely fashion.

Response time10 hrs
Recommended by94%of homeowners
JMW Mechanical Heating & Cooling
4.7(
15
)
Boiler or Radiator Heating System - Install or ReplaceElectric Boiler or Radiator Heating System - InstallGas Boiler or Radiator Heating System - Install+3 more

Serving Alton, IL and surrounding areas

Credit card accepted

"Very professional company. He returned my call promptly, came out to install my water heater in timely manner, and followed up after job was finished. He went above and beyond to make sure everything was up to code. I have no negative feedback for this provider."
Recommended by92%of homeowners
Avatar for Spengler Plumbing, Heating and Cooling
Spengler Plumbing, Heating and Cooling
3.8(
75
)
Boiler or Radiator Heating System - Install or ReplaceElectric Boiler or Radiator Heating System - InstallGas Boiler or Radiator Heating System - Install+3 more

Serving Alton, IL and surrounding areas

In business since 1971

Emergency services offered

Credit card accepted

"The installation itself was very good.  I noticed the old tank leaking at 2:00pm Tuesday - was replaced by 2:00pm Wednesday.  They came out quickly to provide a bid and settled on Spengler that night and they were here at 8:30am the next morning.  The installer was friendly and considerate - top notch.  The only knock will be the salesman himself - a bit high pressure not a big deal because we knew we were going to use them after the research we had done.  He was here for nearly 3 hours looking things over then writing his bid then discussing with us his bid then sitting in his truck while we reviewed the bid then finally signing the contract.  The most disappointing was the discussing about their calendar - he wanted to be sure my wife knew which month he was "featured" - really - cmon man!
"
Recommended by68%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.

Costs depend on system size, efficiency rating, and additional features like zoning or smart controls.

You can save money on heating oil through a combination of improving home efficiency and smart purchasing strategies.

Home Efficiency and Usage:

  • Improve Insulation: Ensure your home, especially the basement and attic, is well-insulated and sealed against drafts to prevent heat leakage.

  • Manage Your Thermostat: Use a properly calibrated and programmable thermostat. Lower the temperature by a few degrees, particularly when you are away from home or asleep.

Purchasing Strategies:

  • Buy in the Off-Season: Order heating oil during the summer months when prices are generally at their lowest. This strategy is most effective if you have a large primary tank or a separate storage tank to accommodate bulk deliveries.

  • Consider a Delivery Contract: Some companies offer contracts with a set price for the term. This can lead to savings if market prices for oil increase, but you might pay more if prices drop.

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 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.

The Alton, IL homeowners’ guide to boiler installation services

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