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In Vienna, a tankless water heater installed is $8,886 to $10,486. That’s after $500 off any size, the best water heater deal we have. Call SwiftPro, rated 5.0 stars across 1,130 reviews, at (703) 997-9757, 24 hours a day, 7 days a week.
Price range
$8,886-$10,486
8yrs @ 7.99%
$126/mo
15yrs @ 9.99%
$95/mo
Monthly figures on the starting price, the whole price financed, on approved credit. The lender sets the final terms. How financing works
We install in Vienna under Virginia Class A contractor license 2705192276, and SwiftPro is rated 5.0 stars across 1,130 reviews. We cover tankless water heaters in Vienna and Wolf Trap, from 1960s ranches to the new houses on old lots, with the gas line checked from the meter first. Staying with a gas tank on the flue you have is $3,238 to $5,485. Once a year a tankless wants a descale, $300 right now, regularly $350.
5.0 stars across 1,130 reviews
One of our plumbers at a wall-hung tankless unit, the condensate line and the PVC vent in view.
Get your price in writing
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Rather talk now? (703) 997-9757
Licensed and insuredVirginia Class A contractor #2705192276
24/7 emergency serviceWe answer day or night, 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 the same price book as our water heater estimator: the unit, the gas line work it needs, the new venting, the condensate drain, the permit and hauling the old tank away.
Tankless water heater, installed
$8,886 to $10,486
or $148/mo at 0% APR for 60 months
Gas or propane tank on the flue you have, installed
$3,238 to $5,485
or $54/mo at 0% APR for 60 months
Tankless descale, with the plumbing check
$300, regularly $350
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
Prices checked .
Where you land in the range is mostly the gas line. A tankless burner fires far harder than a tank’s, so an older line sized for a tank often has to be upsized from the meter. We look before we quote, so that’s in the number, not a surprise.
A tankless unit’s heat exchanger scales up in hard water, so it wants a descale every year: $300 right now, regularly $350. We’ll show you the inlet screen and what came off it.
What’s different in Vienna
Two thirds of the houses inside the Town of Vienna went up before 1980, most of them ranches and split levels on a gas line that was run for a furnace, a tank water heater and maybe a range. A whole-house tankless can pull more gas at full fire than all three of those together. So on an older Vienna house the first thing we do is trace the line back to the meter and size it, because that decides whether the job is a swap or a new run of pipe.
The second thing is the wall. A condensing tankless vents in PVC through the side or back of the house, and the vent has to sit clear of windows, doors and the property line. On the narrower town lots off Maple Avenue and Park Street, the side yard can be the tight spot, and sometimes the vent goes out the back instead. We pick the spot with you before the quote, not on install day.
About a quarter of the town’s houses are from 2000 on, many of them bigger houses built where a smaller one stood. Those tend to have three or four bathrooms and a soaking tub, which is where a single tank falls short by the second shower. That’s the house that gains the most from going tankless, and often it already has a gas line big enough to carry it.
Out on the county side, Wolf Trap is nearly all detached houses, most of them from the 70s and 80s, with basements on an outside wall. That usually means a short vent run and room to bring the gas line where it needs to go. Any new gas piping takes its own Fairfax County permit on top of the appliance, and we pull it as part of the job.
Neighborhood by neighborhood
Census figures for the owner-occupied homes in each place, and what usually decides a tankless job in houses like them.
By the numbers
From the Census Bureau’s 2020 to 2024 survey. Median year built and heat count owner-occupied homes only.
Nearly the whole town sits in 22180, which it shares with county streets toward Dunn Loring and Merrifield.
Vienna mail outside the town line: Wolf Trap and the Tysons edge in 22182, the Oakton side of 22181, Dunn Loring. The figures are Wolf Trap’s, the biggest piece.
Is it worth it
In a Vienna split level with a 40 gallon tank, the second person into the shower on a winter morning is the one who notices. Town water comes in colder in January, so the tank empties faster, and that’s the month most people start asking about tankless.
In older houses, when a high-efficiency furnace stops using the chimney, the water heater is left alone on a flue sized for two. A tankless vents through the wall in PVC and takes the chimney question off the table.
When two showers and the dishwasher empty the tank before everyone’s done, a tankless heats as you use it. It won’t run dry, but it has a flow limit, so it’s sized to how many taps run at once.
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Choosing who installs it
Questions to ask anybody who quotes you a tankless, us included.
In a 1960s Vienna house the line to the water heater often branches off a pipe sized decades ago. The installer who looks at the whole run, not just the last few feet, is the one whose price holds.
A tankless burner can draw several times what a tank does. A quote written without checking the line from the meter is a quote that grows on install day.
What matters is how many showers and faucets run at the same time, and how cold the water comes in during winter. Ask what flow rate they sized it for and why.
Two of our crew going over a work order before the day's calls.
From our Google reviews
5.0 stars across 1,130 reviews. Read them on our reviews page.
This Company installed a tankless water system!!! They were great!!! Very Professional & Efficient & they Cleaned up & took out the old water tank! I would highly recommend them!!
Where we work
Next door to Vienna: Oakton, McLean, Fairfax, Annandale and Great Falls.
Questions
Most can. The work is usually a bigger gas line from the meter and a new vent through a side or back wall, since the unit can’t use the old chimney. Both are in our price once we’ve looked.
It does. The Town’s water runs moderately hard, so the heat exchanger scales up over time. A yearly descale keeps it running at full output, and we set it up so the service valves are right there for it.
Installed, $8,886 to $10,486, with the gas line work, the venting, the condensate drain and the permit in that number. A gas tank on the flue you have is $3,238 to $5,485, so the gap is what you pay for the floor space and the hot water that keeps up.
It never empties, because there’s no tank to empty. It does have a limit on how much hot water it makes per minute, and in January, when the water comes in cold, that limit drops. Sized to the number of showers you run at once, a family doesn’t notice.
Ready when you are
Call, or send the form at the top. We look at the gas line, the wall it would vent through and how much hot water you run at once, and you get the price in writing before anything comes out.
SwiftPro Heating, Cooling & Plumbing
4230 Lafayette Center Dr N, Chantilly, VA 20151
44679 Endicott Dr, Suite 211, Ashburn, VA 20147
SwiftPro Plumber & Water Heaters
4200 Lafayette Center Dr, Suite N, Chantilly, VA 20151
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 Vienna and the rest of Northern Virginia. Virginia contractor license #2705192276. 5.0 stars across 1,130 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.