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

Avatar for Mahon Plumbing
Mahon Plumbing
4.6(
199
)
Tankless Water Heater - Repair

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 Tankless Solutions
Tankless Solutions
5.0(
4
)
Tankless Water Heater - Repair

Serving Unionville, MD and surrounding areas

In business since 2013

Free estimates

Emergency services offered

"When I bought my combo tankless boiler/hot water heater, the original installers messed up installation, then couldn't figure out how to fix it. Thank god I found Rod. He fixed their mess, installed a sediment filter that's been super effective, and recently helped fix a venting issue caused during a remodel. He knows his stuff inside out, is fast and efficient, and a real pleasure to work with. Would absolutely recommend him for anyone with on-demand water systems."
Response time1 day
Recommended by100%of homeowners
Avatar for TriState Home Services
TriState Home Services
4.6(
204
)
Tankless Water Heater - Repair

Serving Unionville, MD and surrounding areas

In business since 1949

Free estimates

Emergency services offered

"Brad was great explaining everything from the work that needed done to the heat pump units themselves. I liked that he called prior to his arrival with an ETA . Did do a free estimate with us. We decided not to go with Tristate in the end and went with a small local business instead but Brad was super friendly and helpful."
Furnace Tune Up
Floor Heating System
Additional Photos
Additional Photos
Additional Photos

+2

Response time1 day
Recommended by91%of homeowners
Avatar for Mark Group
Mark Group
4.4(
467
)
Tankless Water Heater - Repair

Serving Unionville, MD and surrounding areas

In business since 1974

Free estimates

Credit card accepted

"I think they are on Angie's List.  I've got branches everywhere.  They did the energy survey to save us some money.  They were telling me about where we would have heat loss and they found few small gas leaks.  They work in collaboration with the program of New York State which was really how we got them.  I was interested in what they were offering so I didn't feel the pressure to put up on them.  They came to my house and did their survey.  They did all the paper work that was needed for New York State.  New York State gives $400 reimbursement for the survey process, for whatever cost the survey would be and the work that they performed.  I guess the state's pushing for people to become more energy efficient so this was part of that program and then the state's also do random survey's in comeback to make sure that the company did exactly what they said they did and that the savings were there.  They were good.  Before finishing it, it was almost like a month back and I think there were some internal problems with the company.  Whatever it was that they were going through but they came back and finished it.  I think they were neat.  They did insulation around the top of the foundation in the basement, in the attic.  There are a certain things that New York State require and they did all those and they said that new York state would come around and randomly sample to see if the work was done.  I have no problems.  I've got the gas leak fixed, I've got water heater fixed and also the insulation.  The bottom-line is it took a little longer but it all worked out.  They were always reachable.  They had no problem explaining things.  They made accommodations."
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+14

Recommended by83%of homeowners
Avatar for Murphy Family Electric
Murphy Family Electric
4.4(
2,222
)
Tankless Water Heater - Repair

Serving Unionville, MD and surrounding areas

In business since 2000

Free estimates

Credit card accepted

"Appointment was made easily online. Danny called to arrive at an earlier time. He was punctual, professional, and did an amazing job removing and replacing a kitchen lighting fixture. We are so thankful for Danny and his great work. We will call again if future repairs are needed. Thank you!"
installing meter base and mast
Dan the man
mast and weather head with guy kit
relocated panel
Family Electricians

+11

Recommended by85%of homeowners
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