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Best boiler installation pros near Union, OH

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  • Average homeowner rating star icon4.6
    Average homeowner rating
  • Verified reviews icon1.1k+
    Verified boiler installation services reviews

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

Avatar for Extreme Heating And Air Conditioning
Extreme Heating And Air Conditioning
4.7(
160
)
Boiler or Radiator Heating System - Install or ReplaceElectric Boiler or Radiator Heating System - InstallGas Boiler or Radiator Heating System - Install+3 more

Serving Union, OH and surrounding areas

Approved

In business since 2004

Free estimates

Emergency services offered

"We got several quotes from local HVAC providers / installers. We felt the most comfortable with the salesman from Extreme One Hour Heating and Air Conditioning and I got the best price from them which also included a 2-year membership in their Comfort Club (Spring and Fall service visits to check and tune-up my system). We were an all electric home until a couple of years ago when we added natural gas. When our 16-year old Trane heat pump developed problems this proved an ideal time to switch over to a gas furnace and air conditioner. We stayed with Trane as we were happy with our Trane heat pump. Because we have some space constraints and limitations for our new system, Extreme sent out their system designer the day before the installation to develop a creative solution that met our requirements and efficiently maximized the space with which they had to work with minimum impacts to us. The day of the install they arrived on time, were friendly but very professional and treated our home as if it was their own. They also took the time to answer my questions while the worked. Since it was bitter cold that day, they needed to be in and out all day, and we were without a heating system most of the day, they brought a heavy duty space heater to keep us from freezing until they were done. At completion, showed us how to use the new system including the new programmable thermostat, changing filters, etc. and they cleaned up everything and left our home better than they found it. They then submitted all of our rebate paperwork to Vectren and DP&L for us. We were very impressed with the whole process of buying and installing a complete new HVAC system. I highly recommend Extreme One Hour Heating and Air Conditioning for and HVAC installation work!"
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+47

Response time7 hrs
21 neighbors recently requested a quote
Recommended by89%of homeowners
M & S Heating Service Company, Inc.
4.1(
8
)
Oil Boiler or Radiator Heating System - InstallGas Boiler or Radiator Heating System - Install

Serving Union, OH and surrounding areas

Approved

In business since 1957

Free estimates

Emergency services offered

"My husband and I were completely satisfied with H and M Heating and Cooling. We switch from a water boiling system to a conventional furnace in October. The men were on time, professional, and did excellent work. I would highly recommend them."
6 neighbors recently requested a quote
Recommended by80%of homeowners
Avatar for Kelly Heating & Air Conditioning Inc
Kelly Heating & Air Conditioning Inc
4.3(
73
)
Boiler or Radiator Heating System - Install or ReplaceElectric Boiler or Radiator Heating System - InstallGas Boiler or Radiator Heating System - Install+3 more

Serving Union, OH and surrounding areas

In business since 1990

Emergency services offered

Credit card accepted

"We hired them for an initial inspection of HVAC systems when we saw some problems on a home inspectors report. Etta who works at the front desk was wonderful to talk with about the different issues and setting up appointments. After the inspection, we learned that most systems were fine, just the AC needed fixed (it was 15 years old). Lloyd was very helpful explaing the difference between repairing and replacing the unit, which helped us make the best decision moving forward. They are a very friendly and professional company with good prices, I would recommend them to anyone in need of HVAC services.
"
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+1

Recommended by87%of homeowners
Avatar for NEW CLIMATE HEATING & AIR CONDITIONING
NEW CLIMATE HEATING & AIR CONDITIONING
4.5(
18
)
Boiler or Radiator Heating System - Install or ReplaceElectric Boiler or Radiator Heating System - InstallGas Boiler or Radiator Heating System - Install+3 more

Serving Union, OH and surrounding areas

In business since 1990

Free estimates

Emergency services offered

"I was advised by another HVAC service company that I needed to replace the condenser motor and fan on our cooling system. I was provided an estimate in excess of $1,000. So, I opted for a second opinion. I contacted Kirk Wiesman at New Climate. Kirk evaluated the unit that same day and stated that it is difficult to predict when the motor may fail. With young children in my home, I prefer to error on the side of caution and wanted the motor replaced if I could afford to do so. Kirk stated that the fan was fine and did not need to be replaced. As promised, Kirk provided later that same day an estimate to replace the motor ($393). We agreed upon a date and time for the work to be completed. Kirk showed up on time and installed a direct replacement (original equipment) motor.  Kirk explained the charges, which matched the estimate.  Kirk also explained the warranty on this work."
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+12

Recommended by100%of homeowners
Avatar for Ribbit Heating and Air Conditioning LLC.
Ribbit Heating and Air Conditioning LLC.
4.8(
8
)
Boiler or Radiator Heating System - Install or ReplaceElectric Boiler or Radiator Heating System - InstallGas Boiler or Radiator Heating System - Install+3 more

Serving Union, OH and surrounding areas

In business since 2010

Free estimates

Emergency services offered

"The gentleman who came to do the repair was polite, thorough, and explained everything to me in a way I could understand. Problem fixed at a fair price. Unfortunately, he didn't show until 6.5 hours after the original appointment, though there was communication throughout the day. Still an inconvenience when I stayed home from work for the appointment, had to work late to make up for it, and then had to leave work again only to sit and wait for nearly an hour."
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+4

Recommended by100%of homeowners
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Install Boiler FAQs, answered by experts

Always consult your manual for specific pressure numbers. Many expansion tanks come pre-pressurized at a specific PSI range, anywhere from 12 to 40 PSI, designed for a range of home boilers. You should not have to pressurize an expansion tank yourself, only the boiler system. If your system has a tank that needs to be manually pressurized, this is generally a job for professionals and their tools.

It takes about five to 10 minutes for heat to reach a radiator, then about one hour until the radiator fully heats up a room. The exact duration depends on the size of the room and how far away the radiator is from the boiler heating system. Heating up an entire house could take up to two hours.

Coolant and antifreeze are technically not the same thing. The difference between the two is the ratio of water to other chemicals. True antifreeze is mainly made up of either ethylene glycol or propylene glycol, while coolant comprises one part antifreeze and one part water. However, the terms coolant and antifreeze are often used interchangeably, even by pros.

If you hear your radiator clanking even when it’s turned off, it’s typically because there’s trapped water or air in the system, causing a pressure buildup. When you hear significant clanking, popping, crackling, or banging in a radiator that’s turned off, you’ll want to bleed the pipes or call in an HVAC specialist to deal with the problem (and prevent it from happening in the future).

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.

The Union, OH homeowners’ guide to boiler installation services

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