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

Markool Heating & Cooling, LLC
4.7(
18
)
Water Heater - Repair or Service

Serving Unionville, MD and surrounding areas

Approved

In business since 2019

Free estimates

Credit card accepted

"Professional and efficient. Chris did an A/C repair on a part under warranty from another company. He quickly coordinated getting the new part through the warranty and completed the repair quickly. Will recommend to others."
Response time1 day
15 neighbors recently requested a quote
Recommended by94%of homeowners
Avatar for Mahon Plumbing
Mahon Plumbing
4.6(
199
)
Water Heater - Repair or Service

Serving Unionville, MD and surrounding areas

Approved

In business since 1994

Emergency services offered

Warranties offered

"It went amazing. Paid the extra bucks for emergency service, because of our smallish waterfall, looking leak, sprouting from a bathroom pipe, enough to puddle water onto our basement/laundry room floor. Initially, spoke to Chris, who was pleasant and upfront with the per hour fees, for emergency services. He sent us Tim, who was hesitant at first, due to the location of the leak, but his experience and knowledge, enabled him to decipher the location of our leak and fix it. A quick trip to Lowes, where he promptly returned and in 90 minutes, the job was done. A week later and the valve is bone dry. Yay!!!"
Tankless water heater installation
Tankless Water Heater Installation
Commercial drain cleaning
Sewer Line Video Inspection
Water heater replacement

+30

Response time7 hrs
Response rate100%
Recommended by92%of homeowners
Avatar for Dave the Plumber, LLC
Dave the Plumber, LLC
4.2(
188
)
Water Heater - Repair or Service

Serving Unionville, MD and surrounding areas

Approved

In business since 2000

Warranties offered

Small jobs welcome

"Dave The Plumber was awesome. They replaced and upgraded my water heater with ease and no mess. I found the price the be very reasonable, too. They were very polite with great communication. I knew what was going on every step. I definitely recommend their services!"
Our work
Our work
Our work
Our work
Our work

+11

Response time6 hrs
26 neighbors recently requested a quote
Recommended by80%of homeowners
Avatar for Benjamin Franklin Plumbing
Benjamin Franklin Plumbing
3.9(
107
)
Water Heater - Repair or Service

Serving Unionville, MD and surrounding areas

Approved

In business since 1949

Free estimates

Credit card accepted

"Our water heater died, and was leaking. We called after hours, and owner answered the phone. Technician came out next day, and he showed up on time and replaced the heater. Plumber was very courteous, professional, and helpful with advice. No complaints - work is guaranteed. Only downside: price for the water heater itself was high - could have bought comparable unit much cheaper at HD or Sears, but would then have needed to have it delivered and installed by the plumber anyway. Their work is was very good, which was most important and we would definitely use them again."
Water Heater 1
Water Heater 2
Water Treatment
Fixed Leak 2
Leaking Under Sink 1

+12

Response time6 hrs
13 neighbors recently requested a quote
Recommended by58%of homeowners
F.H. Furr Finksburg
4.7(
3
)
Water Heater - Repair or Service

Serving Unionville, MD and surrounding areas

Approved (Corporate)

Customers say: True professional

F.H. Furr provides residential products and services in the plumbing, heating, air conditioning, and electrical business. They put their customers first and provide them with quality products from trained technicians. F.H. Furr has committed to the highest degree of professional development and training in the industry, to work diligently in exceeding every expectation of the client in need. Based out of Manassas, Va., the company has expanded throughout Northern Va., Rockville, Md., Fredericksburg, and Richmond, Va. Whether you need plumbing, heating, cooling, or electrical repairs or replacements, call on F.H. Furr for "Absolutely The Best" service!

2 neighbors recently requested a quote
Recommended by33%of homeowners
Avatar for TriState Home Services
TriState Home Services
4.6(
204
)
Water Heater - Repair or Service

Serving Unionville, MD and surrounding areas

In business since 1949

Free estimates

Emergency services offered

"Darren, the Salesman, was extremely knowledgeable and helpful. Very low pressure sale tactics, but laid out all of the options for you. The crew came and finished installing a new heat pump and heat exchanger in a half day and then another individual returned the next day to install a new water heater. Great communication and attention to detail every step of the way! Would highly recommend!"
Furnace Tune Up
Floor Heating System
Additional Photos
Additional Photos
Additional Photos

+2

Response time1 day
Recommended by91%of homeowners
Avatar for Murphy Family Electric
Murphy Family Electric
4.4(
2,222
)
Water Heater - Repair or Service

Serving Unionville, MD and surrounding areas

In business since 2000

Free estimates

Credit card accepted

"Sean did my service and he was exceptional. Very communicative about arrival time, did installation/repair quickly and price was very fair. Also, was able to schedule online, which was awesome, and was able to see me within the week!"
installing meter base and mast
Dan the man
mast and weather head with guy kit
relocated panel
Family Electricians

+11

Recommended by85%of homeowners
Avatar for Mark Group
Mark Group
4.4(
467
)
Water Heater - Repair or Service

Serving Unionville, MD and surrounding areas

In business since 1974

Free estimates

Credit card accepted

"They pointed out areas of air loss that needed to be covered or blocked and advised  more attic insulation which service they will provide. Their price offer seems reasonable.  I'm still crunching numbers.
"
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+14

Recommended by83%of homeowners
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FAQs for water heater repair or service projects in Unionville, MD

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 Unionville, MD 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.