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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Great Falls boiler service covers gas and propane units in these large detached homes.
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 Great Falls
About 46 in 100 owner homes here heat with natural gas, and another eight in 100 use propane from a tank in the yard. That propane share is far higher than the county average. Most of the houses in Great Falls are detached, with a median build year of 1986. A boiler in this town is often in one of the larger homes, where space allows for a floor-standing unit. We do not work on oil boilers. If you are switching from oil to a gas, propane, or heat pump system, that is a project we can price.
County tax records show two-thirds of homes here have a daylight basement. That ground-level access makes servicing a boiler much easier than reaching an attic unit. When swapping a cast iron boiler for a condensing model, the venting changes completely. The old metal flue in the chimney is replaced by white plastic piping that exits through the exterior wall. In a daylight basement, that pipe often goes straight out the same wall that opens to the yard, keeping the setup simple and code-compliant.
Fairfax County requires a permit to replace any gas appliance, even like for like. Replacing a fuel-burning appliance also needs a chimney vent certification. If your boiler is on propane, the same permit rules apply. The county’s fire department advises having gas appliances inspected every fall and keeping a CO alarm on every floor. A boiler that is leaking or struggling to maintain pressure is a safety issue, not just a comfort one. The $99 diagnostic identifies the specific failure before you decide on repair or replacement.
Many Great Falls homes are large, with a median of 3,700 square feet above ground. That size often means the heating system is split, with a boiler for the lower floors and a separate system for the upper levels. If one floor is cold while the other is warm, check the thermostats first. A boiler that is working but not reaching the upper radiators may have air in the lines or a failing circulator pump. Both are repairs, not replacements, and the $99 tune-up in the fall can catch them before winter makes them urgent.
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
What it’s telling you
With split heating, one unit quitting leaves the rest of the house warm. If the cold floor’s boiler is past fifteen years, let the $99 diagnostic price the repair. If it is the pump or the expansion tank, it is a fix.
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. In Great Falls, where two-thirds of homes have a daylight basement, the vent path often goes straight out the yard-facing wall. We check that route, including the chimney if you are keeping a cast iron unit, before pricing. The venting method changes the work, so we inspect it end to end first.
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.
Questions
Yes. A propane boiler uses the same components as a natural gas one, but the burner and gas valve are set for propane pressure. Your propane supplier keeps the tank and the line to the house. Propane boilers are priced on the same range as gas, with the venting named in the written quote.
Age alone does not decide it. If the heat exchanger is leaking, the unit is done. If the issue is the circulator pump, the pressure relief valve, or the expansion tank, those are parts we can swap. The $99 diagnostic visit identifies the specific failure so you know exactly what you are looking at before any work begins.
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 Great Falls 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.