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

Avatar for Wallace Plumbing
Wallace Plumbing
5.0(
22
)
Tankless Water Heater - Repair

Serving Long-green, MD and surrounding areas

Approved

Super Service Award Winner

In business since 2023

Free estimates

Emergency services offered

"Derrick did a great job! He worked efficiently and his communication was excellent. He left the bathroom spotless, fixed the toilet issue by replacing the mechanism in the tank, and showed me what he repaired. I highly recommend Derrick and will be calling him again if I have any plumbing issues in the future! Thank you Derrick!"
Additional Photos
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+14

Response time9 hrs
Response rate100%
Recommended by95%of homeowners
Avatar for Mahon Plumbing
Mahon Plumbing
4.6(
199
)
Tankless Water Heater - Repair

Serving Long-green, MD and surrounding areas

Approved

In business since 1994

Emergency services offered

Warranties offered

"This company is nothing other than excellent. A bit pricey, but you only get what you play for - and I got plenty. On Saturday afternoon, I found out that I needed a complete sewer line replacement. By late Sunday afternoon, I had one! The crew had to dig down about 10 feet to remove the broken line and then had to tunnel under my patio to get to the cast iron pipe in order to connect the new line. After the installation, the dirt was replaced, the area was seeded and covered with straw, and the sidewalks and parking lot were sprayed clean. Every single guy in the crew was friendly and knowledgeable. Special thanks to Gregg, Chris and Mike. I have recommended Mahon to friends and family and have already scheduled another job. If you need a good plumber, whether for something major or minor, I highly recommend Mahon Plumbing."
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 A&C Plumbing and Heating
A&C Plumbing and Heating
5.0(
8
)
Tankless Water Heater - Repair

Serving Long-green, MD and surrounding areas

Approved

In business since 2019

Free estimates

Emergency services offered

"Chris was my plumber and he was knowledgeable, courteous and responsive to my project. I would highly recommend this company for your plumbing and heating needs. They will be my go-to service provider for my future needs."
Response time3 hrs
Recommended by100%of homeowners
Avatar for Prime Plumbing, LLC
Prime Plumbing, LLC
4.4(
42
)
Tankless Water Heater - Repair

Serving Long-green, MD and surrounding areas

Approved

Super Service Award Winner

In business since 2012

Small jobs welcome

Credit card accepted

"We’ve been a customer of Prime Plumbing since they first opened their doors …..they have always delivered prompt , professional and reliable service , 7 days a week . Whether it’s replacing a hot water heater or updating a bathroom, we’ve relied on Prime to keep our buildings up and running and our customers happy !"
Septic Pumping
Hydrant Removal
Failed Hydrant
Response time3 hrs
228 neighbors recently requested a quote
Recommended by21%of homeowners
Avatar for Ensor Plumbing
Ensor Plumbing
4.3(
135
)
Tankless Water Heater - Repair

Serving Long-green, MD and surrounding areas

Approved

In business since 1961

Emergency services offered

Warranties offered

"Great company, easy flexible scheduling and very knowledgeable plumbers. They came prepared with everything needed to replace and repair plumbing issues plus in the time frame stated. Definitely will hire them again."
Water Treatment System
Radiator Installation
Tankless Water Heater Installation
Well pump
New water treatment Installation

+15

Response time1 day
5 neighbors recently requested a quote
Recommended by90%of homeowners
Avatar for Bamford Plumbing and Heating Inc
Bamford Plumbing and Heating Inc
4.8(
65
)
Tankless Water Heater - Repair

Serving Long-green, MD and surrounding areas

In business since 2009

Emergency services offered

Warranties offered

"I have been using Bamford Plumbing for over 10 years at various different properties. Doug has been a key part of my team to manage multiple different rental properties as well as my own home. He is the first person I call for a variety of different issues that come up. Highly recommend!"
Do you know if your sump is still working? We also have sump pumps avialable to protect you from power outages. That’s right no power no problem forget about the “battery back up” sump pumps if you have municipal water supply this is the way to go call today for details !
Tankless
Power Vent
Gas and Electric
Tree roots giving you problems with your drains? Have us come out today and try a Rootx root treatment !

+2

Recommended by98%of homeowners
Avatar for Hamilton Plumbing, Heating & Air Conditioning
Hamilton Plumbing, Heating & Air Conditioning
4.9(
141
)
Tankless Water Heater - Repair

Serving Long-green, MD and surrounding areas

In business since 1978

Free estimates

Credit card accepted

"I found my water heater leaking just after 9 AM. Called and was given a quote over the phone. They arrived by 11 AM and were done by 2:30. Very good service. They covered my floors with drop cloths, cleaned up nicely and hauled away the old unit. Price included the new water heater, a new shutoff, valve, fittings, drip pan and expansion tank. Professional service done very promptly at a fair price. I was extremely satisfied!"
Toilet before and after
Shower diverter before and after
Response time8 hrs
Recommended by98%of homeowners
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