Sized For Your Home
Sized against how your household actually uses hot water, not against what is on the truck.
Tank Water Heater Repair & Installation In Gaithersburg, MD
Repair, replacement and installation for gas, electric and high-efficiency tank water heaters across Gaithersburg and Montgomery County — sized to the household, flushed annually, warrantied in writing.
4.9 from 2,979 Google reviews
30+ Years 30+ Years Serving Maryland
24/7 Service 24/7 Emergency Service
WSSC Licensed WSSC Licensed & Insured
Locally Owned Locally Owned and Operated
Tank Water Heater Service in Gaithersburg
Tank water heater repair and replacement
A storage tank is still the most common way to heat water in a Maryland home, and for most houses it remains the right answer. Mallick services gas, electric and high-efficiency tank units — repair, replacement and new installation — across Gaithersburg and Montgomery County.
Replacing a failing tank before it leaks can help prevent damage to the surrounding floor and belongings.
Schedule Tank Water Heater Service
Tell us what you need — we’ll be in touch fast.
Explained Before We Start
Repair and replacement options explained before work begins.
Warrantied In Writing
One year on installations, 30 days on repairs, in writing, backed by the crew that did the work.
Tank leaking or out of hot water? We explain repair and replacement options.
Call (301) 804-6759Worth Knowing
Sizing a tank to the house, not the truck
Sizing is the decision most often got wrong, and it is got wrong in both directions. A household of two or three is usually served by a 40-gallon tank; larger households generally need 50 to 80. Oversizing means heating water that nobody uses, and undersizing means running out mid-shower.
We size to the household's actual pattern of use rather than to the unit that came off the truck, and we will say when the tank you have is already the right one.
How the call runs
How a tank water heater call runs
An annual flush removes sediment that can insulate the burner from the water, making the heater work harder and wear out sooner.
The anode rod is worth checking on the same visit. It corrodes to help protect the tank lining.
You call, we answer
You reach a real person, day or night. A leaking tank is an emergency dispatch, not a booking.
Diagnosed on site
A WSSC-licensed technician diagnoses the unit on site — thermostat, element, valve, anode or tank.
Both options explained
We compare repair and replacement, with sizing based on how the house uses hot water.
Warrantied and permitted
One year on installations, 30 days on repairs, in writing, with the WSSC permit and inspection pulled as part of the job.
Why Mallick
Maryland Has Trusted Mallick For 30+ Years
WSSC-licensed and insured crews, and warranties in writing: one year on installations, 30 days on repairs. The same standard whether it is a tank water heater call at 2pm or a burst line at 2am.
Google reviews
2,979
4.9 average across Gaithersburg, Frederick and Woodbine
Ways To Save
Current Offers On This Job
$75
Off
Water Heater Replacement
Can be applied to Standard or Tankless Replacement
Limit 1 offer per customer, cannot be combined with other offers, residential use only, must be presented at time of service. Not applicable to dispatch charge. Only applies for work performed. Valid Jan 1 – Dec 31, 2026.
$32
Off
Any Plumbing Service
$1 off for Each Year We’ve Been in Business!
Limit 1 offer per customer, cannot be combined with other offers, residential use only, must be presented at time of service. Not applicable to dispatch charge. Only applies for work performed. Valid Jan 1 – Dec 31, 2026.
Our maintenance plan
The Service Contract Of Choice
A 12-month annual maintenance contract for your home’s plumbing. The team is small enough to give you personalized attention and large enough to handle whatever comes up.
What stands behind every contract
12-month coverage term
24/7 emergency line
Licensed, trained technicians
Payment plans available
2-Year Extended Warranty for Furnished & Installed Equipment
6-Month Repair Warranty
Levels are matched to your home
The office confirms the current contract levels and details before you commit — call and the team will walk you through the options.
12-month term · Sign up by phone
Customer Field Notes
What Customers Remember After The Call
4.9
2,979 Google reviews across three Maryland locations
Field note 01 · Gaithersburg, MD
“Eric and Nick did a wonderful job.”
Very thorough and provided detailed explanation of what was needed to get our garbage disposal up and running.
Abbas and Koli were great technicians.
Quickly diagnosed the issue, thoroughly explained everything, and gave me a few options to move forward. I've had great experiences working with Mallick, highly recommend.
Chrissie Schenkel · Gaithersburg, MD Abbas came to our house for an emergency repair on a Saturday.
He was courteous and kind, he didn’t rush, and he worked hard to fix our problem and thoroughly investigate. It was hard to find a plumber who could do this on a Saturday at the last minute, and we appreciated Mallick’s and Abbas’s willingness.
Raj Nayak · Gaithersburg, MD Abbas Rahimiari was exceptionally professional, looking at our two plumbing problems, describing the underlying issues, fixing one immediately and explaining options on the other. Courteous, clear and efficient. And knowledgeable.
Gordon Schatz · Gaithersburg, MD I had a wonderful experience with Billy.
He was amazing and he was able to fix my issue with no concerns! 10/10! Thank you Billy.
Mia Barker · Gaithersburg, MD Excellent service and support from William Clem and Malick Plumbing.
Had a pinhole leak in a water service line. Found and fixed the problem … thanks so much.
Daryle Seckar · Gaithersburg, MD Roberto and Adelson were great to work with, efficient, and answered all questions. Top service and repair of water heater!
Jonathan Daly · Gaithersburg, MD
Fred and Luka were great!
They took the time to find the issue as well as helping me get opinions on future concerns as a new homeowner! Real experts and will work with them again!
Elijah Wadsworth · Woodbine, MD Abbas and Koli were fantastic.
They quickly identified and resolved our issue, and did a check to ensure there were no other sleeping issues. They were a pleasure to work with, respectful, and kind.
Kelley Barnaby · Gaithersburg, MD I received great service from both Ikem and CJ today.
They quickly identified the leak and fixed the issue. They also did a great job replacing some valves that needed replacing. They were very experienced and efficient. I have used Mallick several times and have always been pleased with their service.
Melissa Cavuto · Gaithersburg, MD Abbas and Erick were professional, knowledgeable and kind.
They inspected and guided me to make safe choices with my range that had a gas leak.
Andrea Huerta · Gaithersburg, MD Abbas and Bryan installed my new water heater.
There was a leak in my furnace and they fixed it also! The job was perfect. They had to install vents that were well done. They left no trace and the house was completely clean. The new water heater works like a charm. HIGHLY RECOMMEND this team and Mallick.
Janet · Gaithersburg, MD Kyle was so helpful in helping my husband and I fix the water pressure in our house. Kyle was very well versed and experienced, providing great options for future improvements to water filtering. I would highly recommend his services to anybody struggling with plumbing issues.
Azusena Herrera Tapia · Gaithersburg, MD
Every quote above comes directly from Mallick’s current Google Business Profile record.
Read more customer storiesCommon Questions
Tank Water Heater Questions, Answered
Still Stuck?
Talk To A Plumber
(301) 804-6759Someone picks up 24/7 — nights, weekends, and holidays included.
How does water quality affect the lifespan of a water heater?
Hard water can leave mineral scale inside a water heater, reducing heat transfer and contributing to earlier wear. Water chemistry also affects the anode rod that helps protect the tank from corrosion. Maintenance should follow the manufacturer's instructions and your water conditions. If you have a softener, the anode may need closer attention. We can assess the water and heater together before recommending maintenance or equipment.
How often should I flush my tank water heater?
Once a year. Sediment can insulate the burner from the water, making the heater run longer and wear out earlier. An annual flush helps remove that buildup.
What size tank water heater do I need?
It follows household use rather than square footage. Two or three people are usually well served by a 40-gallon tank; larger households generally want 50 to 80 gallons. Habits matter as much as headcount — back-to-back showers and a large tub change the answer. We size it against how the house actually uses hot water.
How long does a tank water heater last?
Most conventional tanks last eight to twelve years. Water quality and maintenance affect lifespan. Repeated faults in an older unit are a reason to assess replacement.
What should I compare when choosing a new tank?
Consider the efficiency rating, expected lifespan, fuel supply, available space and household hot water demand.
Where We Work
Tank Water Heater Service Across Maryland
Bethesda Rockville Silver Spring Germantown Potomac Olney Clarksburg Damascus Chevy Chase North Potomac Frederick Woodbine Columbia Ellicott City Aspen Hill Boyds Burtonsville Darnestown North Bethesda Poolesville Takoma Park Wheaton–Glenmont White Oak Green Valley Linganore Washington, DC College Park
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