Open 24/7 for emergencies
A tank flush in Round Hill is $99 right now and a tankless descale $300, on Town water that tests up to 317 mg/L hard.
Get your price in writing
Send this and the office calls or texts you back to set a time.
We’ll call or text this number about your request. By sending it you agree to our terms and privacy policy.
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 Round Hill
The Town of Round Hill pumps its water from wells, and its 2025 water quality report puts hardness between 115 and 317 mg/L on the main system, about 6.7 to 18.5 grains a gallon, with the separate Stoneleigh system at 182. The USGS calls anything past 180 very hard, and the Town’s handbook names the water heater as one of the places that calcium collects over time.
Hot water holds less calcium in solution than cold, so a tank on this water lays down a crust on its bottom every year, noticed or not. About four in ten owner homes in 20141 burn propane, and on a propane water heater the flush comes with a look at the burner, the flame and the flue, since a crust between the flame and the water sends heat up the flue instead.
A tankless takes it harder still, because the water squeezes through a narrow heat exchanger. Navien’s installation manual puts a tankless in 9 to 12 grain water on a yearly flush, and above 12 grains, which the top of the Town’s range clears easily, it calls a softener or its own scale treatment required. Without treatment, a yearly descale at $300 is the least it should get.
The flush comes with a whole-home plumbing check, and in Round Hill the pressure reading on it means something. Loudoun County has required a pressure reducing valve on new water services for years, the Town’s report says those valves wear and can clog, and on Stoneleigh the Town is looking at valves of its own for the lower parts of the community. Past the Town’s service area, a house on its own well has no report at all: a hardness test at the tap is how you’d know, and the well itself is a well company’s.
By the numbers
From the Census Bureau’s 2020 to 2024 survey. Median year built and heat count owner-occupied homes only.
ZIP 20141 as a whole: every Round Hill address, the Town and the neighborhoods around it. The Census place for the Town alone has too few homes for steady figures.
When it’s due
The Town says an orange tint can show up now and then, from small amounts of iron and manganese left after treatment. If it shows only at the hot taps, the iron has likely settled in the tank, and a flush is where to start.
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 Town water the number is in the Town’s own report: 115 to 317 on the main system, 182 on Stoneleigh. Whoever sets your flush or descale schedule should know which system you’re on, or test the tap, first.
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 Round Hill: Purcellville, Bluemont, Philomont, Hamilton and Middleburg.
Questions
Once a year at least, from the first year. A year of sediment at this hardness rinses out readily; ten years of it sets into a crust the drain valve can’t pass, and no flush undoes that.
It’s a separate Town system, and the 2025 report lists its hardness at 182 mg/L, about 10.6 grains: inside the main system’s range, still very hard by the USGS scale. The Town is also working on Stoneleigh’s pressure, so the gauge reading at your flush is worth hearing.
$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 Round Hill 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.