It pops or rumbles
That’s water boiling under a layer of sediment on the bottom of the tank. A flush clears it out.
Manassas, Virginia
Water heater flush in Manassas.
Water heater flushes and tankless descaling in Manassas, inside the City and out. $99 for a tank flush right now.
Get your price in writing
Send this and the office calls or texts you back to set a time.
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Rather talk now? (703) 997-9757
- Tank or tankless, any brand
- Priced before we start
- Pay after the visit
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
What a water heater flush costs in Manassas.
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 Manassas
Soft water in the City of Manassas, a blend just outside it.
Manassas is the one place we work where the honest answer changes with the address. Inside the City the water comes from Lake Manassas, and the City’s 2025 report lists hardness at 47 parts per million, 2.7 grains per gallon. That’s soft. Navien asks for no yearly descale under 4 grains, so a tankless on City water can go longer.
Cross the city line and most Manassas addresses are on Prince William Water, which says Greater Manassas and Manassas South get a blend of Lake Manassas water and Potomac water from Fairfax Water. Its 2025 tests ran 2.6 to 10.5 grains per gallon across its systems, and out there a tankless goes back on the yearly schedule. Manassas Park is its own city with its own utility; your water bill says who you’re on.
A tank on soft water still earns its yearly flush. It builds less scale, but sediment still settles and the anode rod still wears. Prince William Water puts it plainly in its FAQ: most manufacturers recommend annual water heater cleansing.
Nearly half the City’s houses went up in the 1980s and 90s, and about three in ten are townhouses, so the heater is usually in a basement or a closet off the laundry. Sudley, just outside the line, is older, its median home built in 1977, and closer to half townhouses.
Neighborhood by neighborhood
Where the water heaters are across Manassas.
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 |
|---|---|---|---|---|
| City of Manassas | 1985 | single-family houses, about 4 in 10 | electricity, about 5 in 10 | A yearly flush, and a look at the anode rod. |
| Buckhall | 1995 | single-family houses, about 8 in 10 | electricity, about 5 in 10 | A yearly flush, and a look at the anode rod. |
| Sudley | 1977 | townhouses, about 4 in 10 | gas, about 6 in 10 | Townhouses: utility rooms and closets, so we check the pan and the valves. |
| Independent Hill | 2000 | single-family houses, nearly all | gas, about 6 in 10 | Newer houses: original tanks reaching the age for an anode check. |
| Bull Run | 1995 | condo and apartment buildings, about 5 in 10 | gas, about 7 in 10 | Closet heaters over a pan: we flush to a bucket or the laundry drain. |
| Yorkshire | 1984 | single-family houses, about 4 in 10 | gas, about 5 in 10 | A yearly flush, and a look at the anode rod. |
| Loch Lomond | 1968 | single-family houses, nearly all | gas, about 7 in 10 | Older houses on their second or third heater: we read the label first. |
By the numbers
Manassas houses, by the numbers
From the Census Bureau’s 2020 to 2024 survey. Median year built and heat count owner-occupied homes only.
The City of Manassas
The whole City sits in ZIP 20110. It runs its own water, sewer and electric service.
- Median home built1985 Census
- Built before 1980about 4 in 10 Census
- Built since 2000about 2 in 10 Census
- Most homes aresingle-family houses, about 4 in 10 Census
- Heated withelectricity, about 5 in 10 Census
- Rentedabout 3 in 10 Census
- In the City of Manassas, about 5 in 10 owner homes heat with electricity. On an electric water heater, sediment settles around the lower heating element, and clearing it is part of the flush.
The Prince William County side
Sudley and Bull Run in 20109, Yorkshire and most of Buckhall in 20111, Independent Hill in 20112, plus the county edges of 20110.
When it’s due
Why people in Manassas book a flush.
Nobody knows when it was last done
Which is most houses. The drain valve at the bottom of the tank has usually never been opened.
The tankless throws a code
E016 or E030 on a Navien, LC on a Rinnai. Scale in the heat exchanger is the usual reason, and a descale is the fix.
Choosing who does it
How to pick who flushes your water heater in Manassas.
Questions worth asking anybody you call, us included.
Do they check the anode rod and test the relief valve?
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.
On a tankless, do they pump descaler through it?
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
What our customers say.
5.0 stars across 1,132 reviews. Read them on our reviews page.
Excellent service and attention to detail. James was super thorough and explained everything to me. I highly recommend them for any plumbing needs
SwiftPro delivered and installed a 75 gallon AO Smith water heater. Zabi was very professional in his communication, plumbing, testing, and cleanup. Good crew to move new heater to basement utility room and take out the old heater.
Where we work
Water heater flush in every Northern Virginia town we serve
Next door to Manassas: Bristow, Nokesville, Clifton, Centreville and Catharpin.
Fairfax County
Arlington County
Loudoun County
Prince William County
Fauquier County
Stafford County
Questions
Water heater flush questions from Manassas.
Is Manassas water soft?
Inside the City, yes: 47 parts per million in its 2025 report, 2.7 grains per gallon. Outside the city limits Prince William Water blends in Potomac water, and its 2025 tests ran 2.6 to 10.5. City water lets a tankless go longer between descales.
Should I still flush a tank on City of Manassas water?
Yes, with less to flush out. Soft water makes less scale, but a tank still collects sediment and the anode still wears, so the flush and the anode check still pay for themselves.
How much does a water heater flush cost in Manassas?
$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
Book the flush, tank or tankless.
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 Manassas 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.