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In Fairfax Station, 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 Fairfax Station under Virginia Class A contractor license 2705192276, and SwiftPro is rated 5.0 stars across 1,130 reviews. Tankless water heaters for Fairfax Station’s big detached houses, with a unit sized to the bathrooms and the pipe run, whether you cook on gas or propane. 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 Fairfax Station
Eight in ten Fairfax Station houses went up between 1980 and 1999, and nearly every one is detached. That’s a house with a master suite at one end, kids’ bathrooms at the other and a heater in the basement or a garage corner in between. Hot water in a house that spread out has a long trip, and a tankless unit doesn’t change the pipe. We look at the run to the farthest bathroom first, because it decides whether one unit is enough or whether the job wants a small recirculating loop so nobody waits at the tap.
The tank that came with those houses has either been replaced once already or is well past its years. Pricing a wall unit now, with the hot water still working, is a calmer afternoon than doing it from a puddle.
Gas is the sorting question. About six in ten owners here use utility gas, which Washington Gas supplies, and the rest split between electricity and a small share on propane. If your house cooks and heats on natural gas, the line was probably run for a furnace and a range and a fireplace, and we check whether it can carry a tankless on top of them. A house with propane can take a propane tankless, with the same sizing question asked of the tank outside. A house with no gas of either kind usually stays with a tank.
The good news is the lot. Most Fairfax Station houses sit well back from the neighbors, so the PVC vent has room to leave through a side or rear wall clear of windows, doors and the property line, and the condensate line has somewhere easy to go. Tight infill lots are the hard case for venting. This isn’t one.
Neighborhood by neighborhood
Census figures for the owner-occupied homes in each place, and what usually decides a tankless job in houses like them.
| Place | Median home built | Most homes are | Heated with | What usually decides the job |
|---|---|---|---|---|
| Fairfax Station | 1982 | single-family houses, about 9 in 10 | gas, about 5 in 10 | A short PVC vent out the basement wall. |
| South Run | 1988 | single-family houses, nearly all | gas, about 9 in 10 | A short PVC vent out the basement wall. |
| Crosspointe | 1993 | single-family houses, nearly all | gas, about 8 in 10 | A short PVC vent out the basement wall. |
By the numbers
From the Census Bureau’s 2020 to 2024 survey. Median year built and heat count owner-occupied homes only.
ZIP 22039 as a whole: every Fairfax Station address. The Fairfax Station Census place in the table also takes in streets with Fairfax mail.
Is it worth it
In a five bedroom colonial the heater can be seventy feet of pipe from the last bathroom. If you’ve stood there waiting for hot water while the cold runs down the drain, tell us which room, because that’s the one we size the plan around.
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.
A tankless unit hangs on a wall about the size of a carry-on bag. Where a 50 or 75 gallon tank took a corner of the utility room, the floor under it is yours again.
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Choosing who installs it
Questions to ask anybody who quotes you a tankless, us included.
A tankless unit heats water fast, but it can’t shorten pipe. An installer who asks about the farthest tap is thinking about the wait you’ll actually have, not just the gallons per minute on the box.
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 Fairfax Station: Burke, Springfield, Fairfax, Annandale and Lorton.
Questions
Often, yes. A propane tankless exists and installs much like a natural gas one, vented through a wall in PVC. We check the line and the tank outside for enough supply, and we’ll tell you if the answer is to stay with a tank. Our water heater estimator is a fast first look.
Usually, if it’s sized to how many taps run at once. A tub fill and a shower together is the heavy moment, and a unit has a flow limit, so we count those moments with you before we pick the size.
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 Fairfax Station 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.