Open 24/7 for emergencies
A new boiler runs $9,900 to $16,500 installed, a tune-up is $99 a system, and a repair gets a written price after the $99 diagnostic.
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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Boiler repair and replacement in Fairfax, where the City’s 1966 homes hold the hot water systems.
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 Fairfax
The median owner home there was built in 1966, and about three in ten predate 1960. Those houses were built before forced air became the standard, so radiators or baseboard heat are common. On the county side, in Fair Lakes and Fair Oaks, the median home is from 1998. Most of those use furnaces. A boiler in a 1998 house is rare. If you have one, it is likely a retrofit or a specific design choice, but the bulk of our boiler work in Fairfax is in the older City stock.
About seven in ten homeowners in the City of Fairfax heat with gas. That means the boilers we service are usually gas-fired. The plumbing in these 1960s homes is often copper or steel, which is standard for hot water loops. The expansion tank and the pressure relief valve on a loop that old need checking every fall to keep the system steady.
Replacing a boiler in the City of Fairfax involves the City’s permit office. A Fairfax mailing address outside the city line goes through Fairfax County. If you are on the county side, replacing a gas boiler requires a permit, even if it is a like-for-like swap. The county also requires a chimney vent certification when replacing a fuel-burning appliance. If you are swapping a cast iron boiler for a condensing unit, the venting changes from a metal chimney flue to white plastic pipe through the wall. That change means the old chimney flue is no longer used for the boiler, which simplifies the roof but requires a new wall penetration.
In the condo and apartment buildings of Merrifield and Fair Oaks, boilers are often shared systems or individual wall-hung units. The space is tight, so a wall-hung combi or a compact boiler is the usual choice. For the detached homes in the City, the boiler often sits in a basement or utility room. If you hear kettling, a rumble in the heat exchanger, or see drips from the relief valve, those are signs the system needs attention before winter peaks.
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 |
|---|---|---|---|---|
| Fair Oaks | 1995 | condo and apartment buildings, about 5 in 10 | gas, about 6 in 10 | Condo buildings: a central boiler is usually the association’s. |
| City of Fairfax | 1966 | single-family houses, about 5 in 10 | gas, about 7 in 10 | Older houses, where cast iron boilers and radiators still turn up. |
| Fairfax Station | 1982 | single-family houses, about 9 in 10 | gas, about 5 in 10 | 1980s and 90s houses, mostly forced air; boilers in the older ones. |
| Kings Park West | 1976 | single-family houses, about 7 in 10 | gas, about 5 in 10 | Older houses, where cast iron boilers and radiators still turn up. |
| Merrifield | 1990 | condo and apartment buildings, about 6 in 10 | gas, about 6 in 10 | Condo buildings: a central boiler is usually the association’s. |
| Fair Lakes | 1998 | townhouses, about 3 in 10 | gas, about 7 in 10 | 1980s and 90s houses, mostly forced air; boilers in the older ones. |
| Long Branch | 1968 | single-family houses, about 9 in 10 | gas, about 7 in 10 | Older houses, where cast iron boilers and radiators still turn up. |
| Mantua | 1968 | single-family houses, about 7 in 10 | gas, about 7 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.
Most of the Fairfax Station Census place, in the table, has Fairfax mail, so it counts here.
What it’s telling you
In a 1960s City of Fairfax home, that combination usually points to air trapped in the loop or debris settling in the heat exchanger. It is not a safety emergency, but it means the water is not circulating properly. A $99 diagnostic sorts out whether bleeding the radiators fixes it or if the heat exchanger needs cleaning or replacement. The price is in writing after the diagnosis.
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.
A Fairfax address can sit inside the City, which runs its own permit office, or out in Fairfax County. Ask which one your street files with before the quote is written.
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.
I would gladly recommend them to anyone in the greater Fairfax/Alexandria area without reservation.
Swiftpro came out the same day I called when my AC was out and had it fixed in less than an hour after arriving.
…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.
Questions
It does: the County’s rule covers any gas appliance, a boiler going into the same spot included, and a fuel-burning appliance also needs its chimney vent certified.
It depends on your address: the City’s permit office inside the City of Fairfax, Fairfax County outside the city line, in Fair Lakes or Merrifield.
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 Fairfax 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.