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

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

Serving Knoxville, MD and surrounding areas

Approved

In business since 2019

Free estimates

Credit card accepted

"Just started working with Markool this summer and they have been fantastic! When I need service, they are so fast and every person we have interacted with has been polite, knowledgeable and personable. We unexpectedly needed to replace our system during a heat wave and they were super. So responsive and quick. I would highly recommend Markool for all of your HVAC needs!"
Response time1 day
16 neighbors recently requested a quote
Recommended by94%of homeowners
Avatar for Dave the Plumber, LLC
Dave the Plumber, LLC
4.2(
188
)
Water Heater - Repair or Service

Serving Knoxville, 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
24 neighbors recently requested a quote
Recommended by80%of homeowners
Avatar for Orbit Water Solutions
Orbit Water Solutions
4.8(
44
)
Water Heater - Repair or Service

Serving Knoxville, MD and surrounding areas

Free estimates

Emergency services offered

Credit card accepted

"My experience with this company and the water solutions that they provided was phenomenal. Even though our home was quite a ways away from their normal service area, they were still able to send a team member, Zoe, out the next day to do a test of our well water. Zoe went through all of the different tests and thoroughly explained the results every step of the way. The next day they were able to send out a team to install the recommended water softening and filtration solutions. The guys that came out to do this work were quick, clean, and able to answer any of our questions. We could feel and taste the difference in our water immediately. We don't have to use as much soap for the dishes or for the shower as we used to thanks to all the hardness being filtered out. Our hair and skin feels much cleaner after a shower. The water not only tastes better, but we feel more at ease drinking it. My morning coffee tastes so much better and is much stronger than before (so now I can use less coffee). Ultimately, I highly recommend this company if you want to have a test done of your water quality are considering a water filtration system."
Additional Photos
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+9

Recommended by97%of homeowners
Avatar for TriState Home Services
TriState Home Services
4.6(
204
)
Water Heater - Repair or Service

Serving Knoxville, 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 Angel Services Group
Angel Services Group
4.4(
919
)
Water Heater - Repair or Service

Serving Knoxville, MD and surrounding areas

In business since 1999

Free estimates

Emergency services offered

"Technically the service went very good. Although they were being resistant about getting a permit which is required through my county, they did do it but later sent me a bill through the mail. This also included the price of a drip pan which I thought went hand in hand with the water heater. I was not aware I would have to pay these additional fees."
finished kitchen.
Mr. Espana
Mr. Lopez
Pam Anderson
Mehran Etedali

+84

Recommended by82%of homeowners
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FAQs for water heater repair or service projects in Knoxville, 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 Knoxville, 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.