Open 24/7 for emergencies
Water heater flushes and tankless descaling in Reston, from the lake clusters to the condos by the Metro. $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 Reston
Only about two in ten Reston homes are single-family houses. The rest are townhouses and condos, many in clusters from the 1970s and 80s, and in those the water heater is often in a hall closet or a small utility room with a drain pan under it and no floor drain in sight. So the hose goes out to the laundry standpipe, or into buckets, never across a hallway carpet, and with the tank empty the tech looks over that pan and the small line leaving it, which is all that stands between a slow drip and the room below.
The water is Fairfax Water’s, the county’s supplier for 97 percent of residents, and up here in the north of the county it comes mostly from the Corbalis plant on the Potomac. Its 2025 lab sheet shows the river’s swing month by month: 97 milligrams per liter in April, 70 in May, then 170 by September and 185 in November, roughly 4 to 11 grains a gallon. We plan around the top of that range. Past 4 grains, Navien wants a tankless descaled every year unless a softener is doing the work.
Reston’s cluster associations often keep their own rules about plumbing work, and roughly four in ten homes here are rented. A flush changes nothing an association cares about. If the tank turns out to be near the end, though, check what your cluster asks for before a replacement, and if you rent, that call belongs to the owner.
Close to half of Reston’s owner homes heat with electricity, and in an all-electric townhouse the water heater is electric too: two elements, no burner, no flue. Grit settles over the lower element first, so a shower that turns lukewarm early is often the first sign, and that element gets a meter on it once the tank is empty.
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 |
|---|---|---|---|---|
| Reston | 1981 | condo and apartment buildings, about 4 in 10 | gas, about 5 in 10 | A yearly flush, and a look at the anode rod. |
| Great Falls Crossing | 1993 | single-family houses, about 9 in 10 | gas, about 8 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.
When it’s due
In a cluster townhouse or a condo, the pan under the heater is the only thing between a slow leak and the ceiling below. Water in it, or rust streaks down the side of the tank, means the flush visit starts with the label and the bottom seam, and you hear whether the tank is worth draining at all.
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.
Yes. It drains into a bucket or the laundry standpipe instead of a floor drain, which takes a little more care, and we check the drain pan under it while it’s empty.
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.
Moises and Oscar responded quickly to our need for a new water heater. They came through with a quick and a professional install at a reasonable price. I trust Tyler, Moises, and the team at SwiftPro with my hvac and plumbing needs.
Where we work
Next door to Reston: Herndon, Great Falls, Oakton, Vienna and Sterling.
Questions
Moderately hard to hard, and harder in the fall. Reston’s tap water is mostly Corbalis water, which Fairfax Water’s 2025 tests put near 4 grains a gallon in May and close to 11 by November. Flush a tank once a year here, and descale a tankless on the same calendar.
Not for a flush, which changes nothing outside. For a replacement it can. RA’s guidelines want exposed hardware, vent caps included, painted to match the surface it’s on, and a metal rooftop flue skips the application only on the least visible roof plane, no wider than 14 inches and painted black or the roof’s color. Any other change to the outside of the house goes to RA’s design review first.
$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 Reston 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.