Don’t relight it twice
If the pilot goes out, relight it once by the label’s directions. If it goes out again, stop. Something is wrong with the part that watches the flame, and repeated relights only waste gas.
Annandale, Virginia
Water heater repair in Annandale.
For water heater repair in Annandale, the plumbing visit to find what’s wrong is $49, or $250 after hours. Call SwiftPro, rated 5.0 stars across 1,130 reviews, at (703) 997-9757, 24 hours a day, 7 days a week.
SwiftPro’s plumbers in Annandale are rated 5.0 stars across 1,130 reviews and work under Virginia Class A contractor license 2705192276. Water heater repair in Annandale: a gas tank in a 1960s basement that keeps losing its pilot usually has a weak thermocouple or a draft, and we check both. The repair, a thermocouple, a gas valve, an element or a thermostat, is priced in writing at the tank before we start.
- The failed part named before the price
- Our own licensed plumbers
- Fired up and tested before we leave
5.0 stars across 1,130 reviews
Two of our plumbers at a gas water heater in a Northern Virginia basement.
Get your price in writing
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Licensed and insuredVirginia Class A contractor #2705192276
24/7 emergency serviceWe answer day or night, and we will tell you honestly when we can get there.
Our own plumbers, our own trucksNobody here is a subcontractor with a magnet on the door
The price is settled before the workYou see the number in writing before anything is taken apart
What it costs
What water heater repair costs in Annandale.
The visit fee is the same one on our plumbing price list. What usually fails, and when it’s the tank itself, is in our water heater repair guide.
Plumbing diagnosis visit
$49
Plumbing diagnosis visit, after hours
$250
Water heater repair (thermocouple, gas valve, element, thermostat, burner)
Priced in writing at the tank, before we start
Prices checked .
Where the repair lands depends on the part: a thermocouple or an element is a short job, a gas control valve takes longer and costs more, and either way you see the number before we start.
Water coming out of the tank body itself can’t be repaired. That’s a replacement, and the installed prices for one are on our water heaters page.
What’s different in Annandale
A pilot that keeps blowing out is the usual Annandale call.
Seven in ten Annandale owners heat with gas and the median house went up in 1967, so the typical call is a gas tank in a rambler or split-level basement. The tank sits low on a concrete floor, near the furnace, the laundry and often the dryer. All three move air. A burner that lights fine and then goes out an hour later is rarely a mystery in a house like that.
The thermocouple is the first suspect. It’s a small probe that sits in the pilot flame and tells the gas valve to keep the gas on. When it weakens, the pilot drops out the moment the house gets a draft. Swapping it is a short job. If the pilot lights and holds for a day, then dies, the second suspect is lint and dust built up in the burner tray from years of a basement laundry, and the third is a gas control valve that no longer holds.
Annandale basements also give us the slow leak that turns out to be a fitting. With eight in ten homes built before 1980, many tanks hang off older copper and iron nipples. A drip at the top of the tank can be a corroded connection, which a plumber can redo. A drip from the bottom or the seam cannot be fixed, and we’ll say so before you spend money.
About one in five Annandale homes is in an apartment or condo building, where the tank is more likely electric and tucked into a closet. Those fail at an element or a thermostat, and we test both before ordering anything.
Neighborhood by neighborhood
What fails on water heaters across Annandale.
Census figures for the owner-occupied homes in each place, and what usually fails on the water heaters in houses like them.
| Place | Median home built | Most homes are | Heated with | What usually fails |
|---|---|---|---|---|
| Annandale | 1967 | single-family houses, about 5 in 10 | gas, about 7 in 10 | A thermocouple or a gas valve on an older gas tank. |
| Wakefield | 1968 | single-family houses, nearly all | gas, about 8 in 10 | A thermocouple or a gas valve on an older gas tank. |
| Woodburn | 1968 | single-family houses, about 4 in 10 | gas, about 6 in 10 | A thermocouple or a gas valve on an older gas tank. |
By the numbers
Annandale houses, by the numbers
From the Census Bureau’s 2020 to 2024 survey. Median year built and heat count owner-occupied homes only.
Annandale
- Built before 1980about 8 in 10 Census
- Built since 2000about 1 in 10 Census
- Most homes aresingle-family houses, about 5 in 10 Census
- Heated withgas, about 7 in 10 Census
- Rentedabout 3 in 10 Census
- Most houses here heat with gas, and most of those have a gas water heater too, where no hot water usually comes down to the pilot, the thermocouple or the gas valve.
- Older houses often have the tank in a basement corner with an old shutoff valve above it that won’t fully close, so we check the valve before we drain anything.
The signs
When a Annandale water heater needs a repair.
No hot water at all
On a gas tank that’s usually the pilot, the thermocouple that keeps it lit, or the gas valve. On an electric tank, it’s usually an element or the reset that tripped.
Hot water runs out fast
A shower that goes cold in five minutes often means a failed lower element on an electric tank, or a tank so full of sediment that it heats far less water.
Need water heater repair in Annandale?
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Choosing who does it
How to pick who repairs a water heater in Annandale.
Questions to ask anybody who looks at your tank, us included.
Did they check why the pilot went out, or just relight it?
A relight that holds for a week is not a repair. Ask what they tested: the thermocouple, the draft, the burner tray and the gas control.
Did they name the part before quoting a new tank?
A plumber who goes straight to replacement without testing the thermocouple, the valve or the elements may be selling you a tank you don’t need.
Did they check the relief valve and the venting?
A repair that leaves a stuck relief valve or a bad vent connection behind isn’t finished. Ask what else they looked at while the cover was off.
Two of our crew going over a work order before the day's calls.
From our Google reviews
What our customers say.
5.0 stars across 1,130 reviews. Read them on our reviews page.
Jim was very professional, knowledgeable and polite plumber. He installed a water heater for us. After the installation he educated us on the maintenance and the new set up. I strongly recommend Jim/SwiftPro. Plus SwiftPro price was very reasonable/20% below other estimates.
- 5.0stars across 1,130 reviewsHow we count them
- ABBB Accredited, A ratingCheck it on bbb.org
- 2026Voted a Nextdoor Neighborhood Faves winner two years running: 2026 in 30 Northern Virginia neighborhoods, 2025 in Emerald Chase (Herndon) and Hunters Run (Chantilly)See it on Nextdoor
- #1BusinessRate Best of 2026: the top-ranked heating contractor in Fairfax, VirginiaSee our BusinessRate score
- Class AVirginia contractor, license #2705192276Look it up with DPOR
Where we work
Water heater repair in every Northern Virginia town we serve
Next door to Annandale: Falls Church, Springfield, Dunn Loring, Burke and Vienna.
Fairfax County
Arlington County
Loudoun County
Prince William County
Fauquier County
Stafford County
Every town on one page
Questions
Water heater repair questions from Annandale.
Why does my water heater pilot go out in the fall?
Cold weather brings a stronger draft down the flue and into a basement, and a weak thermocouple can’t ride it out. Fall is when we see the most of these.
Is a drip at the top of the tank a repair?
Often yes. A corroded connector or a loose fitting at the top can be replaced. Check where the water starts. If it comes from the tank body, that tank is done.
How much is water heater repair in Annandale?
The visit to find what’s wrong is $49, $250 after hours. The repair is priced in writing at the tank, before we start, because a thermocouple and a gas valve are very different jobs.
Should I repair my water heater or replace it?
Repair it when the tank is sound and a part failed. When the tank itself leaks, it’s a replacement, and we’ll show you where the water is coming from before you decide.
Ready when you are
Get the hot water back on.
Call, or send the form at the top. We find what failed, show you the part, and you get the repair price in writing before we touch it.
SwiftPro Heating, Cooling & Plumbing
4230 Lafayette Center Dr N, Chantilly, VA 20151
44679 Endicott Dr, Suite 211, Ashburn, VA 20147
SwiftPro Plumber & Water Heaters
4200 Lafayette Center Dr, Suite N, Chantilly, VA 20151
Virginia Class A contractor license #2705192276
SwiftPro Heating, Cooling & Plumbing is a licensed, BBB Accredited (A rating), independently owned heating, cooling and plumbing company in Chantilly, serving Annandale and the rest of Northern Virginia. Virginia contractor license #2705192276. 5.0 stars across 1,130 reviews on Google, Angi, Yelp, the BBB and Facebook. SwiftPro maintains a dedicated HVAC team and a dedicated plumbing team.
From SwiftPro Heating, Cooling & Plumbing in Chantilly. Housing figures are the Census Bureau’s American Community Survey, 2020 to 2024, for each place named; permit, water and sewer facts link to each office’s own page and were checked in September and October 2026.