Boiler repair and replacement in Annandale.
About four in five Annandale owner homes predate 1980, so boilers turn up here: tune-ups are $69, 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
Book your boiler visit
- Hot water boilers, gas and propane
- Navien, Weil-McLain and Force
- Heating and plumbing teams
Boilers in Annandale are the exception, mostly in the pre-1980 houses.
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 $69. 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.
Where the boilers are across Annandale.
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. |
Annandale houses, by the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
Annandale
- Built before 1980about 8 in 10 Census
- Built since 2000about 1 in 10 Census
- Most homes aresingle-family houses, about 5 in 10 Census
- Heated withgas, about 7 in 10 Census
- Rentedabout 3 in 10 Census
- Houses this age are where the boilers are: cast iron, often venting up a chimney shared with the water heater. When one gets replaced, the chimney may need a liner, and that goes in the written price.
- Most homes here heat with gas, so a boiler tune-up here starts with the gas pressure and the flame.
What boiler repair and replacement cost in Annandale.
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 $69 a system, regularly $99.
- High-efficiency condensing boiler or combi boiler, installed$12,782 to $16,50060mo @ 0% $213/mo
- Cast iron boiler on the chimney, replaced like for like, installed$9,900 to $13,69060mo @ 0% $165/mo
- Boiler tune-up, one system$69, regularly $99
- Boiler repair diagnostic visit$99
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.
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
What your boiler is telling you in Annandale.
The boiler is older than the water heater
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.
What the county says about boilers in Annandale.
Fairfax County
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.
How to pick who works on your boiler in Annandale.
Questions to ask anybody who quotes you, us included.
Do they handle the Fairfax County permit for a gas boiler swap?
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.
Can they handle both halves of it?
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.
Does the quote say how it vents?
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.
What our customers say.
…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.
4.95 stars across 1,131 reviews. Read them on our reviews page.
Boiler questions from Annandale.
Can I replace my old cast iron boiler with a condensing unit in Annandale?
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.
Is my Annandale boiler too old to repair?
Age alone does not decide it. In a 1967 Annandale home, the sections have been working for decades. The $99 diagnostic tells you which.
Do you work on steam or oil boilers?
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.
Boiler service in the towns next door.
- Boiler repair and replacement in Falls Church
- Boiler repair and replacement in Springfield
- Boiler repair and replacement in Dunn Loring
- Boiler repair and replacement in Burke
- Boiler repair and replacement in Fairfax
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Get the boiler looked at before the cold week.
Call any time: we run 24/7 emergency service. Or book online and pick a window. A tune-up is $69, a repair starts with the $99 diagnostic, and a new boiler gets a written price before any work.
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. 4.95 stars across 1,131 reviews on Google, Angi, Yelp, the BBB and Facebook. SwiftPro maintains a dedicated HVAC team and a dedicated plumbing team.
SwiftPro Heating, Cooling & Plumbing, 4230 Lafayette Center Dr, Suite N, Chantilly, VA 20151, (703) 997-9757. Book online, read our reviews, or see every town we serve.