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Top-Rated Water heater repair or service pros in Merrimac - Updated Nov 2026

Avatar for Sila Heating, Cooling, Plumbing and Electrical
Sila Heating, Cooling, Plumbing and Electrical
4.5(
5,404
)
Water Heater - Repair or Service

Serving Merrimac, MA and surrounding areas

Approved

In business since 1989

Free estimates

Emergency services offered

Live Your Most Comfortable Life with a Company You Trust. \nWe offer Same Day Service and Next Day Installation! \n \nSila 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. \nWe guarantee satisfaction and are proud to have earned over 7,000 ?A? ratings on Angie?s List and its prestigious Super Service Award!

Additional Photos
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Additional Photos

+6

65 neighbors recently requested a quote
Recommended by89%of homeowners
Avatar for Spencer Home Services
Spencer Home Services
5.0(
25
)
Water Heater - Repair or Service

Serving Merrimac, MA and surrounding areas

Approved

Super Service Award Winner

In business since 1980

Free estimates

Emergency services offered

"This was an emergency service call. Main water supply pipe from street to our house had failed. They responded to call within 45 minutes, evaluated issue, gave us price, Within another half hour equipment showed up. Staff was friendly professional and efficient. Start to finish from initial phone call to replaced main with running water re-established was just over 4 hours. Really impressive company with great customer service. Thank you!"
Repairs
Under Slap Installation
Equipment
Equipment
Equipment

+9

4 neighbors recently requested a quote
Recommended by69%of homeowners
Avatar for Comfort Professor
Comfort Professor
5.0(
24
)
Water Heater - Repair or Service

Serving Merrimac, MA and surrounding areas

Approved

In business since 2011

Free estimates

Emergency services offered

"A different company gave us a quote for $500 to clean the condenser and $2500 to recharge it to check for leaks, so we were dragging our feet. I decided to get another opinion and found Comfort Doctor. They were incredibly responsive and came the next morning. They cleaned the unit for $65 and recharged the unit right then and there with 1 lb of refrigerant. Now it is working great for ~$300. The technician gave us recommendations as if it were his own home and said the quick and inexpensive fix is where you should start. We might not need to do the more expensive leak-check at all unless the system continues to leak substantially."
10 neighbors recently requested a quote
Avatar for Precision Plumbing & HVAC, LLC
Precision Plumbing & HVAC, LLC
5.0(
23
)
Water Heater - Repair or Service

Serving Merrimac, MA and surrounding areas

Approved

In business since 2010

Credit card accepted

Customers say: Quick response

"Marcin was very professional and attentive. He was great at communicating and was very quick to respond. They removed an old hot water tank and installed the new tankless system. I would highly recommend his services. Looking forward to working with them again in the future!"
Response time2 hrs
Recommended by100%of homeowners
Avatar for Bourne Family Plumbing, LLC
Bourne Family Plumbing, LLC
4.8(
12
)
Water Heater - Repair or Service

Serving Merrimac, MA and surrounding areas

Approved

Free estimates

Credit card accepted

"I had a great experience with this plumber! He arrived right on time and was very professional and friendly from the start. I had a leak in the plumbing in the wall between the bathroom and the bedroom and he took the time to explain exactly was going on. He even went under the house (in the cold and dark) to inspect the issue further and took pictures so I could clearly see the problem myself. He explained the repair in a way that was easy to understand and fixed the leak quickly ad professionally. I really appreciated his honestly, communication and the quality of his work. Everything is working perfectly now! I definitely would recommend him and would happily call and refer him if I ever need a plumber's help!!"
project photos
project photos
project photos
project photos
project photos

+14

4 neighbors recently requested a quote
Avatar for Maffei Plumbing and HVAC, LLC
Maffei Plumbing and HVAC, LLC
3.8(
12
)
Water Heater - Repair or Service

Serving Merrimac, MA and surrounding areas

Approved (Corporate)

In business since 2010

Free estimates

Emergency services offered

At Maffei Plumbing and HVAC, LLC, we are committed to your comfort. With an experienced and qualified staff to provide quick service for any service needed. We can solve any problem with a friendly face. Give us a call for a free estimate.

Air Conditioning Installation
Rinnai Tankless
Water Filtration
Heating Systems
Heating Systems

+6

Response time1 day
61 neighbors recently requested a quote
Recommended by12%of homeowners
Avatar for Heritage Home Service
Heritage Home Service
4.1(
1,316
)
Water Heater - Repair or Service

Serving Merrimac, MA and surrounding areas

Approved (Corporate)

In business since 1988

Free estimates

Emergency services offered

"Angel was exceptional, professional, efficient, clean and responsive to every request, fixed numerous issues related to my toilets, noticed a flooring issue that we are now addressing and diagnosed a water heater issue that had been attributed falsely to a foundation issue saving us thousands. They are expensive compared to many but worth every penny we spent."
Career fair
Team breakfast
Festivals and events
Golf tournament
Heritage Helps initiatives

+27

Recommended by91%of homeowners
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FAQs for water heater repair or service projects in Merrimac, MA

Warning signs include fluctuating water temperatures, a pilot light that repeatedly goes out, unusual noises from the tank, or complete heating failure. You might also detect a rotten egg smell, indicating a potential gas leak, or notice water that never reaches the proper temperature. If your water heater is over eight years old and displaying these symptoms, the gas valve is a likely culprit. Professional inspection is recommended, especially if gas odors are present.

Water heater gas valves are not universally interchangeable. Each valve must match your specific water heater's make, model, and specifications. Important compatibility factors include gas type (natural gas vs. propane), BTU rating, connection types, and physical dimensions. Using an incorrect valve can result in poor performance, premature failure, or dangerous gas leaks. Always consult your water heater's documentation or a professional plumber to identify the appropriate replacement valve for your unit.

The Merrimac, MA homeowners’ guide to water heater repair or services

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