Open 24/7 for emergencies
About four in five Annandale owner homes predate 1980, so boilers turn up here: tune-ups are $99, new boilers $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
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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 Annandale
Most houses in 22003 went up before 1980, and the median owner home dates to 1967. Those homes often heated with radiators or baseboard loops, which is where you find boilers here. Newer construction in the area leans heavily on forced air, so if your Annandale home has a boiler, it is likely one of the older structures. That age means the cast iron sections have been working for decades.
Fairfax Water serves this area, and the hardness varies by source. Homes north of the county often draw from the Corbalis plant, while southern homes use the Occoquan source. In a hot water loop, which is a closed system filled once, this water quality does not cause the same scaling issues as an open system. However, the pressure reducing valve and expansion tank are critical. If your home was built before 1972 and pressure exceeds 80 psi, Fairfax Water may provide the valve, but you cover installation. We check these components during every service call to ensure the system stays within safe limits.
Replacing a boiler in Annandale involves specific local rules. If you are switching from a cast iron boiler that vents up the chimney to a condensing boiler that vents out the wall in white plastic pipe, the venting work changes. A condensing unit runs $12,782 to $16,500 installed. The price includes the labor and materials for the new unit and its installation.
A tune-up for a boiler in Annandale costs $99. We check the burner, flame, gas pressure, and system pressure. If you hear a rumble like a kettle, that is kettling, which means scale or sludge is in the heat exchanger.
Neighborhood by neighborhood
Census figures for the owner-occupied homes in each place, and what a boiler call there usually meets.
| Place | Median home built | Most homes are | Heated with | What a boiler call usually meets |
|---|---|---|---|---|
| Annandale | 1967 | single-family houses, about 5 in 10 | gas, about 7 in 10 | Older houses, where cast iron boilers and radiators still turn up. |
| Wakefield | 1968 | single-family houses, nearly all | gas, about 8 in 10 | Older houses, where cast iron boilers and radiators still turn up. |
| Woodburn | 1968 | single-family houses, about 4 in 10 | gas, about 6 in 10 | Older houses, where cast iron boilers and radiators still turn up. |
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
What it’s telling you
In many Annandale homes, the boiler and water heater share a chimney. If the boiler is replaced with a condensing unit, the water heater remains on a flue sized for two. The written price reflects what that flue needs. We check this during the diagnostic to avoid future issues with your water heater venting.
An aging Peerless cast iron boiler in a Northern Virginia basement, chimney vented, on a SwiftPro service call.
Safety and paperwork
Fairfax County requires a permit to replace any gas appliance, even like for like: a gas water heater, furnace or boiler. Replacing a fuel-burning appliance also needs a chimney vent certification. Source.
Fairfax County lists replacing a heating or cooling system as mechanical permit work. Source.
Fairfax County Fire and Rescue names a faulty gas furnace or water heater as a carbon monoxide source, says to have gas appliances inspected every fall, and to put a CO alarm on every floor. Source.
Fairfax County Fire and Rescue says to have the heating system cleaned and checked by a professional every year, and to keep anything that burns at least three feet from the furnace and the water heater. 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.
Yes. We handle the application and the chimney vent certification if needed. You do not need to visit the county office or track the status yourself. The price includes this administrative work.
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 Annandale: Falls Church, Springfield, Dunn Loring, Burke and Fairfax.
Questions
Yes, but the venting changes. This is a different installation. The price for a condensing unit is $12,782 to $16,500, which includes the new venting. We will assess your chimney and wall space to see if this is the right fit for your home.
Age alone does not decide it. In a 1967 Annandale home, the sections have been working for decades. The $99 diagnostic tells you which.
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 Annandale 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.