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Top-Rated Tankless water heater repair pros in Potomac - Updated Nov 2026

Avatar for Jimmy Gusky Heating & Air LLC
Jimmy Gusky Heating & Air LLC
4.3(
374
)
Tankless Water Heater - Repair

Serving Potomac, MD and surrounding areas

Approved

In business since 1996

Emergency services offered

Credit card accepted

"Excellent. Two separate teams came; one for AC and Furnace; second for Tankless hot water heater; Minor toilet repair also done at no extra charge, including a follow up service call to install new toilet flush handle, also at no charge."
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Response time9 hrs
4 neighbors recently requested a quote
Recommended by83%of homeowners
Avatar for Fred and Son Plumbing
Fred and Son Plumbing
4.8(
68
)
Tankless Water Heater - Repair

Serving Potomac, MD and surrounding areas

Approved

In business since 1990

Free estimates

Customers say: True professional

"Exceeded our expectations! I called at 12:30 on a Saturday about a leak in our basement. He was there by 3:00. Found it was our toilet on the first floor. He fixed it all quickly and efficiently. Explained in detail what happened and why it happened. Even explained the hum we hear in the house when the water turns off. Even liked our dog Bruno!"
Recommended by100%of homeowners
Avatar for Beacon Home Services, Inc.
Beacon Home Services, Inc.
4.6(
2,092
)
Tankless Water Heater - Repair

Serving Potomac, MD and surrounding areas

Approved

In business since 2002

Free estimates

Emergency services offered

"Services were prompt, clean and efficient. Tech was knowledgeable and personable. Water heater was affordable. Estimate (free) was done on site - not guessing over the phone."
Beacon Home Services - Electric, Plumbing, Drains
New water heater replacement
Our Team
Electrician - Installing 2 new electrical panels
Beacon Home Services - Electrician

+31

Response time30 mins
Response rate100%
575 neighbors recently requested a quote
Avatar for GAC Services
GAC Services
4.7(
295
)
Tankless Water Heater - Repair

Serving Potomac, MD and surrounding areas

Approved (Corporate)

In business since 1970

Free estimates

Warranties offered

"GAC services was able to come out for a same day trouble shooting appointment. Jim S arrived on time and was very courteous and professional. He was able to quickly identify the problem with the registers and dampers and able to get warm air flowing to the otherwise very cold areas of the house. In addition, Jim was able to recommend some additional services that would help me achieve the desired evenness of temperature such as an additional return and humidifier for the home. Great experienced master certified technician!"
Additional Photos
6 neighbors recently requested a quote
Recommended by93%of homeowners
Avatar for McCarthy Services MD
McCarthy Services MD
4.2(
384
)
Tankless Water Heater - Repair

Serving Potomac, MD and surrounding areas

Approved (Corporate)

In business since 2000

Free estimates

Emergency services offered

"Mr. Brian Langford made all the arrangements with the installation of our gas hot water heater from Lowe's via McCarthy plumbing. He was extremely helpful,patient, professional and available to answer all questions. Due to his approach to his work, we will be working with both companies in the future. Only concern I have is the warranty between Lowe's and AO Smith Hot water heaters. Once the heater is installed, Lowe's severs ties. If there is a problem with the hot water heater, you cannot return it to Lowe's although it was purchased through them, this is clearly stated on the Hot water heater in bold writing."
Installing a new A/C system.
Recommended by87%of homeowners
Joseph plumbing & drain
4.9(
162
)
Tankless Water Heater - Repair

Serving Potomac, MD and surrounding areas

Approved

Super Service Award Winner

In business since 2018

Free estimates

Emergency services offered

"The repair man was a Burmese guy, Joe, and he did an outstanding job changing the anode bar and removing the sediment from my water heater. This should extend the life of the tank. Joe showed up 10 minutes early and finished promptly. He worked hard and had the necessary supplies and tools. He knew what he was doing. I would glad to use Joe again in the future!"
Response time6 hrs
Response rate100%
4 neighbors recently requested a quote
Avatar for DAY & NIGHT PLUMBER LLC
DAY & NIGHT PLUMBER LLC
4.8(
93
)
Tankless Water Heater - Repair

Serving Potomac, MD and surrounding areas

Approved

In business since 2020

Free estimates

Emergency services offered

"I emailed Day and Night Plumber after my old water heater started shooting water out the front panel and within 10 minutes I got a phone call from them with an appointment for an estimate with Marin. The quote was very reasonable and after I supplied the Hybrid Water Heater, Marin was able to come install it on Sunday. He was extremely knowledgeable, efficient, and hard working. He finished everything, cleaned up the area, hauled away my old water heater, and showed me how everything worked. He even gave me a military discount and 12 month warranty on labor. If you need a plumber for anything, give Day and Night Plumber a call, they will give you top notch service for a reasonable price."
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+1

Response time11 hrs
5 neighbors recently requested a quote
Recommended by97%of homeowners
Markool Heating & Cooling, LLC
4.7(
18
)
Tankless Water Heater - Repair

Serving Potomac, MD and surrounding areas

Approved

In business since 2019

Free estimates

Credit card accepted

"Chris was very easy to work with throughout the whole transaction hes very understanding and really wants to keep the customer happy! This company got to the job asp for me and my family! Thanks to you guys we no longer have a carbon monoxide leak!!"
Response time1 day
16 neighbors recently requested a quote
Recommended by94%of homeowners
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