Open 24/7 for emergencies
Water heater flushes and tankless descaling in Oakton, 22124, closet tanks and electric tanks included. $99 for a tank flush right now.
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Rather talk now? (703) 997-9757
5.0 stars across 1,132 reviews
Two of our technicians in a customer’s basement, next to the furnace and a tank water heater.
Licensed and insuredVirginia Class A contractor #2705192276
24/7 emergency serviceOften same-day, 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
Same prices as our water heater flush page, anywhere in Northern Virginia, and you pay after the visit.
Tank water heater flush, with the plumbing check
$99, normally $199
Tankless descale, with the plumbing check
$300, regularly $350
Comfort+ membership, a water heater flush with a sewer camera inspection every year included
$199 a year
Both visits include a whole-home plumbing check: supply lines, shutoffs, a pressure reading, drains, toilets and traps.
One per household, owner-occupied homes, limited time. A leaking tank, or one that’s 15 years old, needs repair or replacement, not a flush.
More for the money: Comfort+ membership, $199 a year, includes the flush and its plumbing check every year, plus a sewer camera inspection, a dryer vent cleaning and heating and cooling maintenance visits.
What’s different in Oakton
Oakton sits inside Fairfax Water’s service area on the county’s own map, and Fairfax Water’s 2025 results put hardness anywhere from 3 to 10.8 grains per gallon, moving with the plant and the season. Near the top of that range a tank lays down a little more sediment every year and a tankless heat exchanger collects scale, which is why once a year is the schedule we go by.
About four in ten Oakton owner homes heat with electricity, and an all-electric house usually has an electric tank. Those don’t rumble the way a gas tank does. The sediment settles over the lower element instead, the element works harder under it, and the first thing you notice is hot water running out sooner than it used to.
About four in ten homes here are townhouses, condos or small apartment units, where the heater stands in a closet or a utility room with no floor drain. The water goes out by hose to the washer’s standpipe or into buckets, slower and tidier, and the drain pan gets a look while the tank is down.
If your house draws from a private well instead of Fairfax Water, there’s no utility report to plan around. Fairfax County’s Health Department recommends testing well water every year, and a hardness reading taken alongside it gives you the number the flush schedule should follow.
Neighborhood by neighborhood
Census figures for each place, and what we’d look at first on a flush there. Median year built and heat count owner-occupied homes only.
| Place | Median home built | Most homes are | Heated with | What we’d look at first |
|---|---|---|---|---|
| Oakton | 1981 | single-family houses, about 4 in 10 | gas, about 6 in 10 | A yearly flush, and a look at the anode rod. |
| Difficult Run | 1982 | single-family houses, nearly all | gas, about 6 in 10 | A yearly flush, and a look at the anode rod. |
By the numbers
From the Census Bureau’s 2020 to 2024 survey. Median year built and heat count owner-occupied homes only.
ZIP 22124 as a whole: every Oakton address. The Oakton Census place in the table also takes in streets with Vienna and Fairfax mail.
When it’s due
On an electric tank that’s often sediment piled over the lower element, and in Oakton four in ten homes are electric. A flush clears it; if the element has already failed, that’s a repair, and we’ll say which.
That’s water boiling under a layer of sediment on the bottom of the tank. A flush clears it out.
Which is most houses. The drain valve at the bottom of the tank has usually never been opened.
Choosing who does it
Questions worth asking anybody you call, us included.
On an electric tank the flush starts at the breaker, not the gas valve, and a good tech tests the lower element while it’s drained. In Oakton about four in ten homes are electric, so say which you have when you book.
The anode is the part that corrodes so the tank doesn’t, and the relief valve is the tank’s safety valve. A flush that skips both is just draining water.
A real descale isolates the heater at its service valves and pumps solution through the heat exchanger, then rinses it and cleans the inlet screen.
Two of our crew going over a work order before the day's calls.
From our Google reviews
5.0 stars across 1,132 reviews. Read them on our reviews page.
I am very happy with the service I received in installing my water heater. Tyson and the crew were very kind and cleaned everything up before they left. I would really recommend this company.
Where we work
Next door to Oakton: Fairfax, Vienna, Reston, Dunn Loring and Herndon.
Questions
Hard enough to matter. Oakton is in Fairfax Water’s service area, and its 2025 figures ran 3 to 10.8 grains per gallon. A tank flush once a year keeps ahead of it, and a tankless without a softener wants a yearly descale too.
If it’s dry and quiet, yes, along with the anode check. If water is coming from the tank itself, or it’s rumbling hard and closing in on fifteen, put the money toward a replacement; our water heater page prices one.
$99 right now for a tank, normally $199, with a whole-home plumbing check. A tankless descale is $300 right now, regularly $350. Comfort+ membership, $199 a year, includes the flush every year.
Ready when you are
Call, or send the form at the top. Tell us tank or tankless, and the tech brings the right gear.
SwiftPro Heating, Cooling & Plumbing
4230 Lafayette Center Dr N, Chantilly, VA 20151
44679 Endicott Dr, Suite 211, Ashburn, VA 20147
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 Oakton and the rest of Northern Virginia. Virginia contractor license #2705192276. 5.0 stars across 1,132 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.