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In Bristow, 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 Bristow under Virginia Class A contractor license 2705192276, and SwiftPro is rated 5.0 stars across 1,130 reviews. Tankless water heaters in Bristow, Victory Lakes and Braemar: mostly 2000s houses on gas, where the question is the townhouse wall, not the age of the pipe. 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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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 Bristow
Almost nine in ten Bristow owner homes heat with gas, and three in four were built after 2000. That is the easy half of a tankless job. A gas line put in during the 2000s was usually sized for a furnace, a tank, a range and often a fireplace, so it is more likely than a 1960s pipe to carry a tankless burner as it stands. We still measure it from the meter before we say so.
The harder half is the wall. About three Bristow owner homes in ten are townhouses, and a tankless needs a side or back wall to put its PVC vent and combustion air through, clear of windows and doors. An end unit has a side wall. A middle unit has a front and a back, and the back is usually a deck or a patio you walk on. We decide it by looking at the house, before the quote.
Victory Lakes is the example. It has 687 single family houses and 609 townhouses, and its covenants committee asks owners to apply before changing the outside of a home. A new vent termination on an outer wall is an outside change, so send the application early and we will give you the unit’s drawing to attach.
Gas in this part of Prince William can come from Washington Gas or Columbia Gas, depending on the street, so read the name on your bill. It does not change the install, but it tells you where a gas meter question goes.
By the numbers
From the Census Bureau’s 2020 to 2024 survey. Median year built and heat count owner-occupied homes only.
Is it worth it
Many Bristow houses have a soaking tub in the primary bath and a single 50 gallon tank behind it. The first tub fill takes most of the tank. If that tank is the original, it is near twenty years old, and the replacement choice is coming either way.
If the original tank is past ten years, the choice is coming either way. Pricing tankless now, while you still have hot water, beats deciding the morning it leaks.
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.
Need tankless water heaters in Bristow?
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Choosing who installs it
Questions to ask anybody who quotes you a tankless, us included.
In a townhouse the answer is rarely the first wall anyone guesses. An installer who has stood outside and picked the wall before quoting will not call you in week one to say the unit does not fit.
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 Bristow: Gainesville, Centreville, Haymarket, Chantilly and Fairfax Station.
Questions
Most can, if there is gas. End units are the simplest. A middle unit needs a clear back wall, and in an HOA you apply for the vent first. We look at the wall before we give you a number.
The water here is moderately hard, so the heat exchanger scales up over the years. A yearly descale, $300 right now, keeps it at full output, and we mount the unit with service valves so that is a quick visit.
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 Bristow 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.