Open 24/7 for emergencies
With gas at zero in the Census, Paeonian Springs boilers burn propane; we tune one for $99 and replace one for $9,900 to $16,500.
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
Send this and the office calls or texts you back to set a time.
We’ll call or text this number about your request. By sending it you agree to our terms and privacy policy.
Rather talk now? (703) 997-9757
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 Paeonian Springs
The village sits about four miles west of Leesburg at the base of Catoctin Mountain, and it was founded around bottled spring water and as a summer escape from the city’s humidity. ZIP 20129 is small: 150 owner homes, detached houses by the Census count. Natural gas registers at zero there. Propane heats close to half the owner homes, electricity about 35 percent and oil nearly one in five.
So a boiler here burns propane or oil. We work on the propane ones; oil is outside what we do. The housing is mostly from the 1980s on, the typical owner home from 1997, with about one in four older than 1980. A propane boiler put in with a house from 1997 has seen a lot of winters, and the heat exchanger’s condition, not the date on the label, tells you whether it’s worth a new circulator or done.
Winter here is longer than in eastern Loudoun. Purcellville, the nearest station, counts over a hundred nights a year at or below freezing, with a January average low of 24.5 degrees. The 2016 blizzard dropped 30 to 36 inches across western Loudoun, and February 2015 left 13.0 inches a mile southeast of the village, among that storm’s top county totals.
Wind is the other risk. On July 15, 2024, winds estimated near 75 mph brought down dozens of large trees, wires and a few poles near Clarkes Gap Road, and in June 2022 a similar storm blocked Hamilton Station Road and Route 7. A propane boiler still needs power for its circulator and controls, so when the lines are down the heat is too, and the fall $99 tune-up is the time to make sure it comes back on its own after an outage.
What it’s telling you
Air works its way to the high points of a hot water loop, so the radiators farthest up stay lukewarm while the boiler runs fine. Bleeding them at the small valve on each one is the first fix. If the pressure gauge drops after bleeding and keeps dropping, the loop is losing water, and that needs finding.
Close view of a SwiftPro boiler installation in Northern Virginia showing the expansion tank, automatic air vent, fill valve and the vent connector into the chimney.
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.
In 20129, with no natural gas in the count, the fuel decides who can help. Ask the company to confirm on the phone that it works on your fuel, so the visit isn’t spent on a boiler they don’t service.
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.
…did a great job recommending a new system for a Condo that did not previously have one at all (Old Boiler System). The installation went great.
Where we work
Next door to Paeonian Springs: Waterford, Hamilton, Leesburg, Lovettsville and Purcellville.
Questions
No. We work on propane and gas boilers, and in 20129 that means propane. If your boiler burns oil, a propane boiler or a heat pump is what we would price instead.
Judge it by the heat exchanger. If it’s sound, the failures around it, a circulator, a zone valve, an expansion tank, are repairs worth making; if it leaks, it’s time. The $99 diagnostic tells you which, with the price written down.
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 Paeonian Springs 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.