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In Gainesville, 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 Gainesville under Virginia Class A contractor license 2705192276, and SwiftPro is rated 5.0 stars across 1,130 reviews. Tankless water heaters in Gainesville, Virginia Oaks and Heritage Hunt, built for the big houses that outgrew a single tank. 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 Gainesville
Eight in ten Gainesville owner homes went up after 2000, and the median is 2007. These are the big houses: a primary suite, a finished basement with its own bath, three more upstairs. Plenty of them have one 50 or 75 gallon tank, sometimes two, and a household of teenagers drains either before the last shower. That demand, more than any pipe or wall, is why people here ask about tankless.
Because the houses are recent, the gas supply is usually the easy part. Builders in the 2000s ran a larger line to serve a furnace, a range and often a gas fireplace or a grill stub on the deck. Two furnaces in a big house can mean two branches off the main, and we check what is left on the meter side before we call it enough.
The vent is the part that needs thinking. Condensing tankless units exhaust through PVC in a side or back wall, and the finished-basement bathrooms in many Gainesville houses sit against the walls that would be easiest. Deciding the wall also decides whether the new condensate drain can fall by gravity to a floor drain or needs a small pump.
A third of owner homes are townhouses, where the wall choice is tighter, and some of the Virginia Oaks and Heritage Hunt homes answer to an association about anything new on the outside. Ask for the association’s rule before you pick a unit, and we will show the vent location on the drawing.
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
The earliest Gainesville houses are close to twenty years old and the 2010s ones are past ten. A tank that large costs real money when it lets go in a finished basement, so pricing the change before the leak is the cheap way to find out.
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.
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Choosing who installs it
Questions to ask anybody who quotes you a tankless, us included.
A Gainesville house can run a furnace or two, a range, a fireplace and a grill. Ask whether the quote counts all of them at once, or just the water heater by itself.
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 Gainesville: Haymarket, Bristow, Centreville, Chantilly and Aldie.
Questions
For the right house, yes, but it has a flow limit, so it is sized to how many showers run together. A big house may need a larger unit or two, and we size it from your bathrooms, not from a chart.
Often. It depends on an open outside wall for the vent and on the association. We check both and put the answer in the quote.
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 Gainesville 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.