Open 24/7 for emergencies
Water heater flushes and tankless descaling in McLean, 22101 and 22102, on Fairfax Water’s Potomac supply. A tank flush is $99 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 McLean
McLean is on Fairfax Water, but most of it isn’t served by Fairfax Water’s own plants: the utility’s 2026 report maps most of McLean in its Washington Aqueduct area, Potomac water treated by the Army Corps of Engineers. The river changes through the year and the tap follows it: Aqueduct water tested 5.6 to 10.9 grains of hardness per gallon in 2025, lowest in late spring and highest in December. That’s plenty for calcium to drop out as sediment on the floor of a tank, or crust the heat exchanger of a tankless, so a McLean flush is planned around the December number, once a year.
In the 1950s and 60s houses, close to four in ten homes in 22101, the gas water heater usually stands beside the furnace in the basement, often sharing its flue, and it’s several heaters removed from the one the builder put in. The newer big houses often run differently: two water heaters, or a single 75 or 80 gallon tank, sometimes with a recirculating pump for the far bathrooms. Two tanks means two flushes, so mention both when you book.
McLean is where we see boilers most. Hot-water heat is a regular part of our McLean heating work, far more than anywhere else we go. In many boiler houses the hot water comes from an indirect tank, a storage tank the boiler heats through a coil inside it. It has no burner or element of its own, and it still gets flushed.
In 22102, which takes in Tysons, close to half of all homes are in buildings of 50 or more units, and more than four in ten owner homes there heat with electricity. In those towers the water heater is often an electric tank in a utility closet over a pan. Some buildings make hot water centrally instead, and then there’s nothing in the unit to flush; your management office knows which.
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 |
|---|---|---|---|---|
| McLean | 1977 | single-family houses, about 8 in 10 | gas, about 7 in 10 | Older houses on their second or third heater: we read the label first. |
| Tysons | 1985 | condo and apartment buildings, about 7 in 10 | electricity, about 5 in 10 | Closet heaters over a pan: we flush to a bucket or the laundry drain. |
By the numbers
From the Census Bureau’s 2020 to 2024 survey. Median year built and heat count owner-occupied homes only.
ZIPs 22101 and 22102 as a whole: every McLean address, Tysons included.
When it’s due
An indirect tank is quiet, with no burner to pop or rumble, so it hardly ever gets a second thought. The bottom still collects sediment through the Potomac’s hard months, and the drain at its base still wants opening once a year.
We flush it into a bucket or the laundry drain, not across the floor, and check the pan under it while we’re there.
That’s water boiling under a layer of sediment on the bottom of the tank. A flush clears it out.
Choosing who does it
Questions worth asking anybody you call, us included.
If your hot water comes off a boiler, ask before you book. Draining an indirect tank means closing it off from the boiler piping first, and a company that does hot-water heat knows those valves. Ours does.
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.
Did a great job replacing a water heater and fixing a leak.
Where we work
Next door to McLean: Dunn Loring, Vienna, Falls Church, Arlington and Great Falls.
Questions
Hard enough to plan around. Most McLean homes get the Washington Aqueduct’s Potomac water through Fairfax Water, and the Aqueduct’s 2025 tests ran 5.6 to 10.9 grains per gallon, hardest in December. A tank wants flushing once a year on that, and a tankless with no softener wants a yearly descale.
Usually, yes. It may be a standalone gas or electric tank, or an indirect tank the boiler heats. Both collect sediment and both get flushed. Say it’s a boiler house when you book, so the tech knows what’s waiting downstairs. If the label puts the tank past 15, our McLean water heater page has the replacement prices.
Yes, when it’s yours, which in a tower is often an electric tank in a closet. We drain it into a bucket or the laundry standpipe instead of across the floor and look at the pan underneath. If the building makes the hot water centrally, there’s no tank in the unit, and that system is management’s to maintain.
$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 McLean 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.