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A new water heater installed with the permit runs $2,757 to $5,493 for an electric tank, $3,379 to $5,485 for gas or propane and $8,886 to $10,486 for tankless.
Price range
$2,757-$5,493
8yrs @ 7.99%
$39/mo
15yrs @ 9.99%
$30/mo
Monthly figures on the starting price, the whole price financed, on approved credit. The lender sets the final terms. How financing works
Get your price in writing
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Water heaters in Haymarket, from the Town to Dominion Valley and Bull Run Mountain: tank or tankless, fixed or replaced at our posted price, permit counted. The water heater estimator gives your exact number.
5.0 stars across 1,132 reviews
Two of our plumbers wheeling a new water heater up a Northern Virginia walkway, the van at the curb.
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
Installed, from our water heater estimator, which is the price book. Everything is in the number: the permit and the inspection, the expansion tank, the drain pan, hauling the old one away, and the labor.
Electric tank, installed
$2,757 to $5,493
or $46/mo at 0% APR for 60 months
Gas or propane tank, installed
$3,379 to $5,485
or $56/mo at 0% APR for 60 months
Power vent tank, installed
$5,957 to $7,494
or $99/mo at 0% APR for 60 months
Tankless, installed
$8,886 to $10,486
or $148/mo at 0% APR for 60 months
Monthly figures: 60mo @ 0% APR on each starting price, the whole price financed, on approved credit. Longer plans lower the payment and cost more in total. The lender sets the final terms. How financing works
How the house vents picks the row; where you land inside it is the tank size and the warranty. A hybrid heat pump water heater is quoted at the visit, never from a page.
Keeping the one you have? A yearly water heater flush slows the sediment down: $99 right now, normally $199. A tankless descale is $300, regularly $350. Or get the flush every year with Comfort+ membership, $199 a year, along with a dryer vent cleaning, a sewer camera inspection and heating and cooling maintenance visits.
What’s different in Haymarket
The Town of Haymarket hasn’t had a building department since January 15, 2018. Prince William County issues every trade permit inside the town limits now, a water heater’s included, but the Town is plain that its own Zoning Approval comes first: the request form goes to the Town’s Zoning Administrator, and only after that does the County application go in. Outside the town, in Dominion Valley, Piedmont or up on the mountain, it’s the County alone. On either side, swapping a gas tank takes a permit even when the new one matches, and trading an electric tank for an identical-size one in the same place takes none.
The tanks come in three ages. The Town’s median owner home was built in 1995, and close to six in ten of its homes went up in the 1980s and 90s, so the heater in one of those houses is usually its second or third. Across all of 20169 the median is 2006 and nearly half the homes date from the 2000s. In a Dominion Valley or Piedmont house from that decade, the tank may still be the one the builder set, and at close to twenty years it’s running on borrowed time.
Bull Run Mountain Estates is the outlier. Its median house is from 1978, oil and electricity each heat about four in ten of them, and propane about one in eight. A propane water heater sits on the same price row as a gas one, and an electric tank swapped in place needs no County permit. The water is the harder part, literally: Prince William Water rates its Bull Run Mountain and Evergreen wells hard, 7 to 10.5 grains a gallon, and a private well carries whatever the ground puts in it, so a tank up there collects sediment faster than one in town.
Going tankless inside the town brings in one more office. The whole town has been a historic district since 1994, and its Architectural Review Board looks at changes the public can see before they’re made. A tank that goes back on its old flue changes nothing outside. A tankless that exhausts through a new hole in a wall facing the street does, so where the exhaust leaves the house is worth deciding early, while you can still choose a unit to fit it.
Neighborhood by neighborhood
Census figures for each place, and the water heater that usually goes with its houses. Median year built and heat count owner-occupied homes only.
| Place | Median home built | Most homes are | Heated with | The water heater you usually find |
|---|---|---|---|---|
| Bull Run Mountain Estates | 1978 | single-family houses, nearly all | electricity, about 4 in 10 | Little natural gas: electric tanks, and propane where there’s a tank in the yard. |
| Haymarket | 1995 | single-family houses, about 6 in 10 | gas, about 6 in 10 | Gas tanks on their second or third replacement. |
By the numbers
From the Census Bureau’s 2020 to 2024 survey. Median year built and heat count owner-occupied homes only.
Inside the town limits only, about one in eighteen of the owner homes with Haymarket mail. Dominion Valley, Piedmont and Bull Run Mountain Estates sit outside it, in the county.
ZIP 20169 as a whole: every Haymarket address, the Town’s homes included.
What you’d notice
When the cold runs clear and the hot comes out brown, the anode inside the tank is usually used up and the steel shell is next. In a Dominion Valley house still on its 2000s tank, that’s the cue to price a replacement before the tank picks the day for you.
On a gas tank that’s usually the thermocouple or the gas valve, both repairs. A burner that lights but smells of exhaust is different: shut it off and call.
A drip from a valve can be fixed. Water from the tank itself can’t; once the lining goes, the only fix is a new heater, and sooner beats later.
If the basement took water
A water heater usually sits on the lowest floor of the house, so it’s one of the first things standing water reaches. Three checks, then call us.
Leave it off and don’t relight it. The warning label on a gas water heater says not to use it if any part has been under water, and to have a service technician replace the gas control.
Shut its breaker off at the panel, but only from somewhere dry. The elements and the thermostats get checked before it heats again.
Mop it up and look again in an hour. Water that comes back with no rain is the tank or a valve, not the storm.
Call us after a storm and we’ll check it: the gas control or the elements, the burner, the venting and the drain pan. If it has to be replaced, you get the price in writing before anything comes out.
Permits and pressure
Inside the town limits the water heater permit is a Prince William County one, as every building and trade permit has been since January 15, 2018, and the Town wants its Zoning Approval issued before that County application is filed. Source.
Prince William County requires a permit to replace a gas or propane furnace or a gas appliance such as a water heater, even like for like. Replacing an electric water heater with one the same size in the same spot needs no permit. Source.
A burst tank doesn’t wait on paperwork: under Virginia’s building code the replacement can start first, as long as the permit application reaches Prince William County by the end of the next working day. Source.
Prince William Water says the pressure reducing valve is the homeowner’s to install and keep up, that the plumbing code recommends one where pressure runs 80 psi or more, and that pressure rises with the height difference between your house and the water tank serving it. Source.
Our Virginia Class A contractor license, 2705192276, is on the side of the van.
Choosing who installs it
Questions worth asking anybody who quotes you, us included.
In 20169 a water heater can burn natural gas or propane or run on electricity, and up on the mountain the furnace beside it may burn oil. Each one changes the venting, the paperwork and the price row, so the first question should be what’s in the house now.
A gas water heater always needs a permit, an electric one often does, and skipping it tends to surface when the house sells. Ask whether the quote includes it and the inspection.
Most houses here have a check valve or a pressure reducer on the incoming line, so the heated water has nowhere to go. An expansion tank gives it somewhere, and leaving it out is how quotes come in low.
A thermocouple, an element or a valve is a repair, not a new heater. A good plumber says so, and saves the replacement talk for a leaking tank.
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.
Alex came out today to check out my water heater. He was on time and was super helpful in answering my questions. Would definitely have SwiftPro out again.
Where we work
Next door to Haymarket: Gainesville, Catharpin, Broad Run, The Plains and Aldie.
Questions
Prince William County. The Town handed its building department to the County on January 15, 2018, so every trade permit inside the town limits is a County permit now, and the Town issues its own Zoning Approval first. Both steps come with the job, and the permit is counted in what we quote: a gas tank that reuses your flue is $3,379 to $5,485 installed.
No, it’s the same water. Prince William Water counts Dominion Valley in its Haymarket system and rates that supply moderately hard; across all the points where water enters its systems, its 2025 tests ran 2.6 to 10.5 grains a gallon. The harder water is up on Bull Run Mountain and at Evergreen, where the utility’s wells rate 7 to 10.5. A yearly flush keeps the sediment from piling up either way.
Not on our book. Propane and natural gas share a row: a tank that keeps the existing flue is $3,379 to $5,485 installed, and that includes the permit, the expansion tank, the drain pan and hauling the old one off. About one in fifteen owner homes across 20169 heats with propane, so it’s a fair question here.
Installed, with the permit, the expansion tank, the pan and the haul-away: an electric tank $2,757 to $5,493, a gas or propane tank on the flue you have $3,379 to $5,485, a power vent tank $5,957 to $7,494, and a tankless unit $8,886 to $10,486. The estimator gives your exact number in about a minute.
Ready when you are
Call, or send the form at the top. The age on the label and what it’s doing tell us most of what we need, and you get the price before anything comes out.
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 Haymarket 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.