Open 24/7 for emergencies
Round Hill’s few boilers burn propane; a yearly tune-up is $99, and a replacement lands at $9,900 to $16,500 installed.
Price range
$9,900-$16,500
8yrs @ 7.99%
$140/mo
15yrs @ 9.99%
$106/mo
Monthly figures on the starting price, the whole price financed, on approved credit. The lender sets the final terms. How financing works
Get your price in writing
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5.0 stars across 1,132 reviews
Two of our heating technicians in a Northern Virginia basement. The same team tunes up, repairs and replaces boilers.
Licensed and insuredVirginia Class A contractor #2705192276
24/7 emergency serviceOften same-day, and we will tell you honestly when we can get there.
Our own HVAC installersA dedicated heating and cooling team, separate from our plumbers
Price in writing firstYou see every option priced before anything is ordered
What it costs
A new boiler runs $9,900 to $16,500 installed, the range of our own boiler replacements; a condensing or combi boiler lands at $12,782 to $16,500. A tune-up is $99 a system.
High-efficiency condensing boiler or combi boiler, installed
$12,782 to $16,500
or $213/mo at 0% APR for 60 months
Cast iron boiler on the chimney, replaced like for like, installed
$9,900 to $13,690
or $165/mo at 0% APR for 60 months
Boiler tune-up, one system
$99
Boiler repair diagnostic visit
$99
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
A repair starts with the $99 diagnostic. If the fix is a circulator pump, a valve or an expansion tank, you get that price in writing before we start, and you decide.
Want a closer number before anyone comes out? The boiler estimator asks a few questions about yours and shows the range for that job.
What’s different in Round Hill
ZIP 20141 holds 2,362 owner homes. Electricity heats a little over half and propane about four in ten, while utility gas reaches only 46 of them, so a boiler in Round Hill burns propane from a tank on the lot. Most of the housing is young: half the owner homes date from 2004 or later, built around forced air. Propane, at about four in ten owner homes, is the town’s second fuel after electricity.
That leaves the boilers in the older houses, about one in seven built before 1980, many on bigger lots outside the town. Out there the boiler is likely cast iron on a chimney, and the swap is either another one in its place or a wall-hung condensing boiler, $12,782 to $16,500 installed, with a plastic vent.
Inside the Town limits, the Town issues the zoning permit first, and only after that does Loudoun County issue the building permit. On the county side it’s the County alone. Either way a propane boiler replacement is permit work, so the sequence belongs in the plan before the old boiler comes out.
Round Hill households mostly own and occupy detached houses, so the repair-or-replace decision sits with the homeowner. October is the month to have the circulator, the relief valve and the system pressure looked at, before the cold makes them urgent. Watch the propane gauge as well, since a tank run low in January can look exactly like a boiler that quit.
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
ZIP 20141 as a whole: every Round Hill address, the Town and the neighborhoods around it. The Census place for the Town alone has too few homes for steady figures.
What it’s telling you
Inside the Town limits a replacement needs the Town’s zoning permit before the County’s building permit. Start that step as soon as the boiler shows signs of going, not on the day it quits. A boiler bought in a rush also skips the sizing question.
An aging Peerless cast iron boiler in a Northern Virginia basement, chimney vented, on a SwiftPro service call.
Safety and paperwork
Loudoun County requires a permit to swap a gas water heater or furnace. Since October 2025, a replacement that keeps the same BTUs in the same spot needs no plans. Source.
In its fall clock-change reminder, Loudoun County’s fire and rescue system tells residents to check their carbon monoxide alarms, and recommends one outside each sleeping area and on each level of the home, tested monthly. Source.
Loudoun County Fire and Rescue says to have heating equipment and chimneys cleaned and inspected every year by a qualified professional, and to keep anything that can burn at least three feet from all heating equipment. Source.
Our Virginia Class A contractor license, 2705192276, is on the side of the van.
Choosing who works on it
Questions to ask anybody who quotes you, us included.
Ask whether the installer gets the Town zoning permit before applying to the County. Skipping that step is how an install day gets cancelled. Ask, too, whether the quote names the propane line from the tank.
A hot water boiler is half heating system (the burner, gas valve, flue and controls) and half plumbing (the water loop, circulator pumps, expansion tank, relief valve and zone valves). We hold a Virginia Class A license and run separate heating and plumbing teams, so each half gets a tech who does that trade every day.
A new boiler can stay on the chimney or vent out the wall in plastic pipe. A good quote says which, and whether the chimney needs a liner, because that’s where two quotes for the same boiler usually split.
Two of our crew going over a work order before the day's calls.
From our Google reviews
5.0 stars across 1,132 reviews. Read them on our reviews page.
…excellent service when my boiler needed to be replaced during the polar vortex. Alex Hittle came quickly, … and replaced my boiler quickly. Alex even managed to change their schedule, with the kind permission of their other customer so that I could have heat again in the freezing weather.
Where we work
Next door to Round Hill: Purcellville, Bluemont, Philomont, Hamilton and Middleburg.
Questions
Replacing one here costs $9,900 to $16,500 installed in our book; a high-efficiency or combi model sits at $12,782 to $16,500. We put the figure for your house in writing at the visit.
With most of the town on heat pumps already, it’s a fair question. If the house has ducts, a heat pump can be priced beside a new boiler; if it doesn’t, ductless mini splits are the heat pump route. A boiler kept on the radiators avoids opening walls for ducts.
No. We work on hot water boilers, the kind that heat radiators or baseboard, on natural gas or propane. If yours is steam or burns oil, we’ll tell you on the phone, and a switch to a heat pump or a gas or propane boiler is ours to price.
Ready when you are
Call any time: we run 24/7 emergency service. Or send the form at the top. A tune-up is $99, a repair starts with the $99 diagnostic, and a new boiler gets a written price before any work.
SwiftPro Heating, Cooling & Plumbing
4230 Lafayette Center Dr N, Chantilly, VA 20151
44679 Endicott Dr, Suite 211, Ashburn, VA 20147
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 Round Hill and the rest of Northern Virginia. Virginia contractor license #2705192276. 5.0 stars across 1,132 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.