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In Warrenton, 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 Warrenton under Virginia Class A contractor license 2705192276, and SwiftPro is rated 5.0 stars across 1,130 reviews. We cover tankless water heaters in Warrenton, from the Historic District streets to New Baltimore and Vint Hill, where gas and propane both turn up. 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 Warrenton
More than a quarter of the owner homes inside the Town of Warrenton were built before 1960, and about 38 percent before 1980. Around the Winchester, Waterloo, Culpeper and Lee Street blocks a house can be a century old, with a gas line added long after the walls went up. That line is often small, and sometimes runs a long way from a meter in the yard to a water heater in the back of a basement.
Gas heats about six in ten owner homes in town, and the town is in Columbia Gas of Virginia’s service area. The rest are mostly on electricity. For those houses, we say it plainly: a tank is usually the right answer, because a whole-house electric unit needs more amperage than a century-old panel has to spare.
Out in New Baltimore and Vint Hill, it flips. Almost every owner home is a detached house, gas heats fewer than half, and propane heats about one in seven. A propane tankless is a real option there, set up for propane, with the line from the yard tank checked for the flow it needs.
The vent is the other old-house question. Inside the Historic District, any change to the outside of a house needs a Certificate of Appropriateness. A side or back wall that the street cannot see is the easier answer. A chimney that used to carry the old water heater cannot take a condensing unit, so we plan the PVC to leave from somewhere else.
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 |
|---|---|---|---|---|
| New Baltimore | 1999 | single-family houses, nearly all | gas, about 5 in 10 | A short PVC vent out the basement wall. |
| Warrenton | 1993 | single-family houses, about 5 in 10 | gas, about 6 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.
Inside the town limits, a little over 4 of the roughly 110 square miles the two Warrenton ZIP codes cover: the Historic District around Main Street, Leeds Square, and the streets off Broadview Avenue and Alwington Boulevard.
New Baltimore only. It’s the one Census place on the county side with mostly Warrenton mail, so the farms and lots beyond it aren’t in these figures.
Is it worth it
In an older Warrenton house the tank is often at the far end of the basement, with the gas line running a long way to it. Tankless is a good fit when the line can be upsized once, and a poor fit when a long run makes it a costly job. We tell you which you are before you pay anything.
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.
Warrenton addresses can be in town on Columbia Gas, out in the county on propane, or on neither. An installer who sorts that out before the quote will not change the price later.
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 Warrenton: Gainesville, Bristow and Haymarket.
Questions
Usually, with the vent on a wall the street does not see. Exterior changes in the district go through the Town’s Certificate of Appropriateness process, so choose the wall first. We help you with the drawing.
If it has a propane tank, yes. If it is all electric, usually not, and we will say so and price a tank instead.
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 Warrenton 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.