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  • Average homeowner rating star icon4.5
    Average homeowner rating
  • Verified reviews icon884
    Verified boiler installation services reviews

Find Boiler installation pros in Cos Cob

N.Z Home Improvement

4.99(
75
)
Approved Pro

N.Z Home Improvement

4.99(
75
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
8 years of experience

We are a full service remodeling company. We specialize in kitchen and bath, tile, carpentry, painting exterior and interior, general and basement remodels. Call us we are here to address all your remodeling needs.

"All our projects were completed competently and on time. Communication was excellent. Work was efficiently done and areas left clean. Workers are nice people."

Judy S on October 2024

We are a full service remodeling company. We specialize in kitchen and bath, tile, carpentry, painting exterior and interior, general and basement remodels. Call us we are here to address all your remodeling needs.

"All our projects were completed competently and on time. Communication was excellent. Work was efficiently done and areas left clean. Workers are nice people."

Judy S on October 2024


Avatar for The Builders & Cleaners

The Builders & Cleaners

4.89(
94
)
Approved Pro

The Builders & Cleaners

4.89(
94
)
Approved Pro
Customers say: True professional
8 years of experience
Free onsite estimate

Based in West Haven, Connecticut, our team has provided an excellent, affordable service to more than thousands of houses over the years. We are committed to supporting our customers throughout the evaluation process, during the service itself and are available to answer any queries once the work is complete. We are a licensed and fully insured company aiming to respond to all requests involving our services within 24 hours or less. Our professional and knowledgeable staff have a combined experience of over 12 years within the construction, air duct cleaning, and landscaping industries, ensuring guaranteed satisfaction with every job. We pride ourselves in providing a safe, hazard-free environment and maintaining respectful, cordial communications with all of our clients. All technicians can be relied on to keep project sites clean both during and after the work is complete.

"Reached out to get our gutters cleaned. David was very responsive and offered a reasonable rate. Did the job quickly and thoroughly, sent lots of pictures and video of the finished work. Very satisfied, would definitely recommend"

Isaac D on October 2025

Based in West Haven, Connecticut, our team has provided an excellent, affordable service to more than thousands of houses over the years. We are committed to supporting our customers throughout the evaluation process, during the service itself and are available to answer any queries once the work is complete. We are a licensed and fully insured company aiming to respond to all requests involving our services within 24 hours or less. Our professional and knowledgeable staff have a combined experience of over 12 years within the construction, air duct cleaning, and landscaping industries, ensuring guaranteed satisfaction with every job. We pride ourselves in providing a safe, hazard-free environment and maintaining respectful, cordial communications with all of our clients. All technicians can be relied on to keep project sites clean both during and after the work is complete.

"Reached out to get our gutters cleaned. David was very responsive and offered a reasonable rate. Did the job quickly and thoroughly, sent lots of pictures and video of the finished work. Very satisfied, would definitely recommend"

Isaac D on October 2025


Avatar for H L Bowman

H L Bowman

4.72(
387
)
Approved Pro

H L Bowman

4.72(
387
)
Approved Pro
Customers say: Super punctual
Recommended by 90% of Angi customers
Recommended by 90% of HomeAdvisor customers
80 years of experience

HL Bowman has been in the same location for 38 years and owned by the same family for over 65 years. HL Bowman is a non commission based company. HL Bowman employees will never upsell you a product you don't need. Dennis and Bryan Enders and his family have deep roots in the Harrisburg community. After 65 years Dennis and family stay committed to giving the community the best possible service and product to fit their needs. HL Bowman has won Angie's List super service award every year.

"Exceptional service from the initial diagnosis to repair, superb team. I appreciated everyone's thoroughness, willingness and honest business tactics. They provided a safe environment for me to ask questions and we explored all options. Ultimately, Joshua, sealed the deal by being caring and understanding. His expertise showed but most importantly his work ethics and integrity was felt. Many thanks to the whole team Brett, Joshua, Jason and Peter delivered Top notch service. Lastly, the communication was A+. Loved receiving text messages with photo id's, true professionals. Highly recommend! You won't be disappointed!"

angela w on August 2025

HL Bowman has been in the same location for 38 years and owned by the same family for over 65 years. HL Bowman is a non commission based company. HL Bowman employees will never upsell you a product you don't need. Dennis and Bryan Enders and his family have deep roots in the Harrisburg community. After 65 years Dennis and family stay committed to giving the community the best possible service and product to fit their needs. HL Bowman has won Angie's List super service award every year.

"Exceptional service from the initial diagnosis to repair, superb team. I appreciated everyone's thoroughness, willingness and honest business tactics. They provided a safe environment for me to ask questions and we explored all options. Ultimately, Joshua, sealed the deal by being caring and understanding. His expertise showed but most importantly his work ethics and integrity was felt. Many thanks to the whole team Brett, Joshua, Jason and Peter delivered Top notch service. Lastly, the communication was A+. Loved receiving text messages with photo id's, true professionals. Highly recommend! You won't be disappointed!"

angela w on August 2025


Avatar for Winners Sewer & Drain

Winners Sewer & Drain

4.98(
31
)
Approved Pro

Winners Sewer & Drain

4.98(
31
)
Approved Pro
Super Service Award
Customers say: Quality work
4 years of experience
Free onsite estimate

Winners Sewer & Drain 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.

"Was great expiernece very educated person who knows what he is doing on top of that he is honest and will not steer you wrong reccomend highly !!"

steven m on September 2025

Winners Sewer & Drain 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.

"Was great expiernece very educated person who knows what he is doing on top of that he is honest and will not steer you wrong reccomend highly !!"

steven m on September 2025


Avatar for Gallery Of Kitchens & Baths

Gallery Of Kitchens & Baths

4.91(
47
)
Approved Pro

Gallery Of Kitchens & Baths

4.91(
47
)
Approved Pro
Super Service Award
Customers say: Quick response
Recommended by 95% of Angi customers
Recommended by 95% of HomeAdvisor customers
36 years of experience

Gallery of kitchens specializes in interior and cabinetry design and has remodeling experience for over 40 years. We assist you in increasing the value of your home and creating a timeless look with a full service turn-key solution. We welcome homeowners, designers and contractors to benefit from our products and services with free consultation and design. Our showroom is full of many cabinet lines to choose from. Additional hours - Mon-Fri 9:00 AM-5:00 PM; Sat 9:00 AM-4:00 PM. 1027 Post Road East, Westport, CT. 06880 203-226-7550. Website. Galleryofkitchens.com. Email. [email protected]

"Great experience! The renovation that their crew did exceeded our expectations in every way. They were knowledgeable, efficient, and dedicated to delivering the highest quality. We love how the space looks now – it’s exactly what we envisioned!"

George L on January 2025

Gallery of kitchens specializes in interior and cabinetry design and has remodeling experience for over 40 years. We assist you in increasing the value of your home and creating a timeless look with a full service turn-key solution. We welcome homeowners, designers and contractors to benefit from our products and services with free consultation and design. Our showroom is full of many cabinet lines to choose from. Additional hours - Mon-Fri 9:00 AM-5:00 PM; Sat 9:00 AM-4:00 PM. 1027 Post Road East, Westport, CT. 06880 203-226-7550. Website. Galleryofkitchens.com. Email. [email protected]

"Great experience! The renovation that their crew did exceeded our expectations in every way. They were knowledgeable, efficient, and dedicated to delivering the highest quality. We love how the space looks now – it’s exactly what we envisioned!"

George L on January 2025


Avatar for Old Faithful Pump Co

Old Faithful Pump Co

5.00(
39
)
Approved Pro

Old Faithful Pump Co

5.00(
39
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
18 years of experience

We are an owner/operator company with 17 years of experience. We are committed to offering honest service and competitive prices. We use quality material and perform work to the highest standard to ensure longevity of the equipment you will rely on every day. We are a full service well pump & water treatment company offering 24 Hour Emergency Pump Service.We also offer water testing, water filtration, UV lights, water softeners and installation and service of water tanks.

"Joe is very experienced and very professional to replace my well pump, bring up the well cap to above ground level and installed house water filter. He discussed the job in detail and gave a fair quote. He came on time and did the job at high quality. He cleaned up everything before he finish. He took the 5% Angies list coupon as well. Will use him again and highly recommended if you need well pump service!"

Zeqiang G on September 2018

We are an owner/operator company with 17 years of experience. We are committed to offering honest service and competitive prices. We use quality material and perform work to the highest standard to ensure longevity of the equipment you will rely on every day. We are a full service well pump & water treatment company offering 24 Hour Emergency Pump Service.We also offer water testing, water filtration, UV lights, water softeners and installation and service of water tanks.

"Joe is very experienced and very professional to replace my well pump, bring up the well cap to above ground level and installed house water filter. He discussed the job in detail and gave a fair quote. He came on time and did the job at high quality. He cleaned up everything before he finish. He took the 5% Angies list coupon as well. Will use him again and highly recommended if you need well pump service!"

Zeqiang G on September 2018


Avatar for E and R Mechanical

E and R Mechanical

4.73(
241
)
Approved Pro

E and R Mechanical

4.73(
241
)
Approved Pro
Super Service Award
Customers say: Super punctual
Recommended by 90% of Angi customers
Recommended by 90% of HomeAdvisor customers
8 years of experience

We pride our company on reliability, great communication, integrity, and quality work. We strongly believe in giving our absolute best in all of our projects, no matter how big, or small. We are experts in our trade, and will always keep you educated on your particular task or project. We look forward to earning your business.

"Installed a new Rheem gas water heater right away. Great price. Quick -efficient service. I will be using them for a new boiler in a few months thank you!"

Renee D on August 2025

We pride our company on reliability, great communication, integrity, and quality work. We strongly believe in giving our absolute best in all of our projects, no matter how big, or small. We are experts in our trade, and will always keep you educated on your particular task or project. We look forward to earning your business.

"Installed a new Rheem gas water heater right away. Great price. Quick -efficient service. I will be using them for a new boiler in a few months thank you!"

Renee D on August 2025


Avatar for Sila Heating, Cooling and Plumbing

Sila Heating, Cooling and Plumbing

4.67(
770
)
Approved Pro

Sila Heating, Cooling and Plumbing

4.67(
770
)
Approved Pro
Customers say: Super punctual
37 years of experience
Free onsite estimate

Live Your Most Comfortable Life with a Company You Trust. We offer Same Day Service and Next Day Installation! Sila has been the center of delighting homeowners since 1989, with our team of engineers, certified technicians, and system designers that are proud to deliver the highest level of expertise in the HVAC industry. Whether it’s a repair, replacement, installation, or service, we have an unwavering commitment to keeping you and your family comfortable and safe — season after season. We guarantee satisfaction and are proud to have earned over 7,000 “A” ratings on Angie’s List and its prestigious Super Service Award!

"I have had Sila come to do work at my home on several occasions. They have been fair and their technicians have always been knowledgeable and helpful to my home improvement needs."

Theresa H on January 2026

Live Your Most Comfortable Life with a Company You Trust. We offer Same Day Service and Next Day Installation! Sila has been the center of delighting homeowners since 1989, with our team of engineers, certified technicians, and system designers that are proud to deliver the highest level of expertise in the HVAC industry. Whether it’s a repair, replacement, installation, or service, we have an unwavering commitment to keeping you and your family comfortable and safe — season after season. We guarantee satisfaction and are proud to have earned over 7,000 “A” ratings on Angie’s List and its prestigious Super Service Award!

"I have had Sila come to do work at my home on several occasions. They have been fair and their technicians have always been knowledgeable and helpful to my home improvement needs."

Theresa H on January 2026


Avatar for Aldos plumbing

Aldos plumbing

5.00(
17
)
Approved Pro

Aldos plumbing

5.00(
17
)
Approved Pro
Customers say: Quick response
Free onsite estimate
Emergency services offered

At Aldo's Plumbing, serving the Tri-State Area, we prioritize customer satisfaction. Our expertise in water heaters ensures that your home projects are handled with care. Contact us today for a seamless experience!

"Aldo replaced an ancient water boiler neatly and quickly. "

James Z on December 2025

At Aldo's Plumbing, serving the Tri-State Area, we prioritize customer satisfaction. Our expertise in water heaters ensures that your home projects are handled with care. Contact us today for a seamless experience!

"Aldo replaced an ancient water boiler neatly and quickly. "

James Z on December 2025


Avatar for Tapia Home Improvement

Tapia Home Improvement

5.00(
24
)
Approved Pro

Tapia Home Improvement

5.00(
24
)
Approved Pro
Customers say: True professional
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
18 years of experience

Free housecleaning with whole-house paint project and special pricing for Angie's Members. Tapia Home Improvement is a locally owned and operated company with over 13 years of experience in our trade. We specialize in home improvement projects with services including: Remodeling (General, Kitchen & Bathroom), Painting (Interior & Exterior), Drywall/Sheetrock, Ceramic Tile, Flooring, Cabinets, Counter-tops and much more. We pride ourselves in the quality of our work and our unparalleled customer satisfaction. We strive to provide the highest levels of customer service. Call us today to schedule an appointment.

"Excellent. On time finished the job with high detail. Crew was very thorough and on time. Miguel is a expert contractor and I enjoy working with him"

Ray D on August 2024

Free housecleaning with whole-house paint project and special pricing for Angie's Members. Tapia Home Improvement is a locally owned and operated company with over 13 years of experience in our trade. We specialize in home improvement projects with services including: Remodeling (General, Kitchen & Bathroom), Painting (Interior & Exterior), Drywall/Sheetrock, Ceramic Tile, Flooring, Cabinets, Counter-tops and much more. We pride ourselves in the quality of our work and our unparalleled customer satisfaction. We strive to provide the highest levels of customer service. Call us today to schedule an appointment.

"Excellent. On time finished the job with high detail. Crew was very thorough and on time. Miguel is a expert contractor and I enjoy working with him"

Ray D on August 2024

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Showing 1-10 of 2090
Install Boiler questions, answered by experts

The absence of heating or hot water, unusual noises like banging or gurgling, and visible water leakage are key signs. Abnormal boiler pressure, flame irregularities (for gas boilers), or pilot light issues may also signal trouble. Frequent cycling, soot or staining, and unusual odors, particularly gas-like smells, should not be ignored. Modern boilers often display error codes or lockout mode upon detecting issues. Uneven heating across radiators and rising energy bills without increased usage can further point to problems. Prompt attention to these signs is essential to prevent further damage and ensure safety.

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.

Boilers are equipped with multiple safety features to ensure safe operation. These include pressure relief valves to prevent overpressure, temperature high-limit switches to avoid overheating, and flame failure safety devices in gas boilers to cut off the gas supply if the flame goes out unexpectedly. Low water cutoffs prevent operation with insufficient water levels, and pressure gauges help monitor pressure levels. Ventilation and flue systems prevent the buildup of harmful gasses. Boilers often feature error code systems for automatic shutdown during malfunctions and gas leak detection for safety. Regular maintenance is crucial to ensure these safety features function correctly.

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.

All modern boilers are condensing boilers because they’re the most efficient type. Instead of extra heat leaving through the flue, these boilers trap the heat and use it to heat the house. Whether you choose a combi boiler, system boiler, or regular boiler, you can opt to get a condensing system. If you have an old boiler that’s not a condensing boiler, it’s a good idea to get an upgrade.

The Cos Cob, CT homeowners’ guide to boiler installation services

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