The tank that never kept up with the house
A 75 gallon tank in a rebuilt McLean house can be empty before the fourth person gets in the shower. Two tanks fix it, but tankless takes less wall and gets you the hot water as you use it.
McLean, Virginia
Tankless water heaters in McLean.
In McLean, 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.
$148/mo60mo @ 0% APR
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 McLean under Virginia Class A contractor license 2705192276, and SwiftPro is rated 5.0 stars across 1,130 reviews. Tankless water heaters in McLean, 22101 and 22102: older houses on large lots, new houses on old ones, and why Tysons is its own question. 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.
- Gas line sized before the quote
- Our own licensed plumbers
- Descaled on a schedule
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
What a tankless water heater costs in McLean.
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 McLean
McLean has the big houses where tankless earns its keep.
Four out of five homes in the McLean Census place are detached, and three quarters of the owners heat with gas. That is the profile of a house where a tankless fits well, and McLean has more of them than most towns. These houses are also large. A tankless sized for the whole house has to cover several bathrooms, so we count the taps that can run together before choosing a unit.
More than four in ten McLean houses went up before 1980, and about one in eight before 1960. On the older ones the gas line was laid for a furnace and a tank, and a tankless wants a bigger pipe than either. In some cases the answer is a larger branch off the main run; in others a new line from the meter. We trace it before we quote it.
About a quarter of McLean homeowners live in houses built since 2000, many of them big houses built where smaller ones stood. Five bathrooms and a two-story layout are common, and with them a long walk from the water heater to the far shower. Without a recirculation loop, you wait for hot water at the faucet while the pipe clears. A tankless can be paired with a return line, and we talk about it at the walkthrough.
Tysons is a different job. Close to three quarters of homes there are in apartment and condo buildings, and just over half of owners use electricity. Those units rarely have an outside wall for a vent, and many buildings heat water centrally. If you own a detached house in either ZIP, the rest of this page applies. If you own a condo, call the management office first.
Neighborhood by neighborhood
What a tankless install looks like across McLean.
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 |
|---|---|---|---|---|
| McLean | 1977 | single-family houses, about 8 in 10 | gas, about 7 in 10 | Upsizing the gas line, venting off the chimney. |
| Tysons | 1985 | condo and apartment buildings, about 7 in 10 | electricity, about 5 in 10 | A short PVC vent out the basement wall. |
By the numbers
McLean houses, by the numbers
From the Census Bureau’s 2020 to 2024 survey. Median year built and heat count owner-occupied homes only.
McLean
ZIPs 22101 and 22102 as a whole: every McLean address, Tysons included.
- Built before 1980about 4 in 10 Census
- Built since 2000about 3 in 10 Census
- Most homes aresingle-family houses, about 5 in 10 Census
- Heated withgas, about 7 in 10 Census
- Rentedabout 4 in 10 Census
- Most homes here heat with gas, so the meter and the main line are already there. The question is whether the branch to the water heater is big enough.
Is it worth it
When going tankless makes sense in McLean.
The hot water runs out every morning
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.
You want the floor space back
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.
Need tankless water heaters in McLean?
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Choosing who installs it
How to pick the best tankless installer in McLean.
Questions to ask anybody who quotes you a tankless, us included.
Will they plan for the walk to the far bathroom?
In a large McLean house, heating the water is half the problem and delivering it is the other half. Ask whether the quote includes a recirculation line, and what it does to the unit’s flow.
Did they look at the gas line before the price?
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.
Do they size it to your flow, not the house’s square feet?
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
What our customers say.
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!!
- 5.0stars across 1,130 reviewsHow we count them
- ABBB Accredited, A ratingCheck it on bbb.org
- 2026Voted a Nextdoor Neighborhood Faves winner two years running: 2026 in 30 Northern Virginia neighborhoods, 2025 in Emerald Chase (Herndon) and Hunters Run (Chantilly)See it on Nextdoor
- #1BusinessRate Best of 2026: the top-ranked heating contractor in Fairfax, VirginiaSee our BusinessRate score
- Class AVirginia contractor, license #2705192276Look it up with DPOR
Where we work
Tankless water heaters in every Northern Virginia town we serve
Next door to McLean: Vienna, Great Falls, Oakton, Annandale and Fairfax.
Fairfax County
Arlington County
Loudoun County
Prince William County
Fauquier County
Stafford County
Every town on one page
Questions
Tankless questions from McLean.
Does a big McLean house need more than one tankless?
Sometimes. One high-output unit handles most houses. Very large ones, or ones with two separate wings, can do better with two units, each close to the bathrooms it serves. We size it from how many taps run at once.
Is my older McLean house a poor candidate for tankless?
No. It tends to need a bigger gas line, and a vent through a wall rather than the chimney. Both are normal work. We look at the line from the meter first, so you know what the job includes before it starts.
How much is a tankless water heater in McLean?
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.
Will a tankless keep up with my whole house?
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
Find out if your house is a fit.
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 McLean 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.