4.7 
91 *The Angi rating for Water Heater Service companies in Frederick, MD is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Water Heater Service needs.
*The HomeAdvisor rating for Water Heater Service companies in Frederick, MD is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Water Heater Service needs.
Last update on July 22, 2026
Serving Frederick, 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."
Serving Frederick, MD and surrounding areas
Approved (Corporate)
In business since 1970
Free estimates
Warranties offered
"Fritz B. was my sales rep and he clearly knew what he was doing, including making a few minor recommendations that were in my financial interest. Easy to set up the scope of work. The grew was great, came in and did a great job, took about 6 hours. They even rerouted the exhaust flue for my hot water heater even though they did not replace the heater because the install guy Chris said "they did this dumb". Overall a great experience and I would recommend."
Serving Frederick, 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!!"
Serving Frederick, MD and surrounding areas
Approved
In business since 1994
Free estimates
Emergency services offered
"We received same-day service. Our serviceman, Fred, did a great job. He was very professional and solved our water heater problem."
+22
Serving Frederick, 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."
+30
Serving Frederick, MD and surrounding areas
Approved
In business since 1992
Free estimates
Emergency services offered
"The pro was very helpful with helping me understand my water heater issue. I learned something new about my water heater and the pro was prompt and friendly."
+2
Serving Frederick, MD and surrounding areas
Approved
In business since 2000
Warranties offered
Small jobs welcome
"I hired a plumber through HomeAdvisor using prepay but I would not recommend this service. The contractor left a leaky pipe that caused water coming up through carpet. I had to purchase a wet vacuum to dry out the carpet. I had to contact HomeAdvisor again and hired Dave the Plumber, LLC who had to redo the installation done previously. Dave the Plumber replaced all the piping and outside spigot because of a water leak the previous contractor left. Thank you Dave the Plumber for being a professional and a job well done."
+11
Serving Frederick, MD and surrounding areas
Approved
Super Service Award Winner
In business since 2015
Emergency services offered
Warranties offered
"Joey fixed our humidifier and showed us how to maintain it properly."
Serving Frederick, MD and surrounding areas
Approved
In business since 2004
Free estimates
Warranties offered
"BB&B removed a faulty garbage disposal and installed a new one. The plumber, at my request, purchased the new unit on my behalf and selected one appropriate for the job without gouging me on the price. The work was done quickly and neatly and I was quite satisfied; I will certainly call them in the future."
Serving Frederick, MD and surrounding areas
Approved
In business since 1999
Free estimates
Customers say: Quality work
"Rob was great. Explained his work and even identified another issue with the water heater pressure apparatus."
From average costs to expert advice, get all the answers you need to get your job done.
Looking to replace or upgrade your water heater? Use this water heater replacement cost guide to see what the work will cost and what factors affect your total.
A water heater flush costs $160 on average but can vary based on the unit size, type, labor, location, and more. Keep reading to learn how much you could pay.
Wondering how much a water heater expansion tank costs? Use this cost guide to get an accurate estimate and learn how to choose the right one for your home.
Done with cold showers and dish washing? Hire a water heater installation pro near you to get back to comfort and safety quickly.
Who can install a water heater for you? Look to hire a water heater installation pro or a licensed plumber for this job because of the challenges involved.
The average lifespan of water heaters is 6 to 15 years for conventional models and up to 20 for tankless ones, but it can be less if they are not properly maintained.
