Boiler repair and replacement in Oakton.

Across ZIP 22124’s 5,922 owner homes, gas heats about half and electricity a little over four in ten, mostly with furnaces and heat pumps. Nearly half the homes went up between 1980 and 1999 around ducts, so a hot water boiler in Oakton usually sits in the close to four in ten built before 1980, where radiators and baseboard are. Fewer than one in twenty owner homes predates 1960, so the boilers here are mostly in the 1960s and 70s houses rather than older ones.

Townhouses are about one in five Oakton owner homes and condos about one in seven; in either, a boiler tends to sit in a closet next to the water heater. A wall-hung combi can take both jobs and vent through the wall, at $12,782 to $16,500 installed, which gives that room back.

In the detached houses, about six in ten owner homes, the choice usually turns on the chimney. If it’s sound, a cast iron boiler can go back on it; if it isn’t, a condensing boiler venting through the side of the house leaves the chimney out of the job. Either way, the County’s permit and chimney vent rules apply to every Oakton address. In a detached house the boiler usually has a basement or a utility room with space to work, so the job is the boiler and its venting, not the room.

Only about one in eight homes here is rented, so most Oakton boiler owners decide for themselves between repair and replacement, and the $99 diagnostic is the place to start: a pump, a valve or an expansion tank is a repair, a leaking heat exchanger is not. If an Oakton boiler fails in a cold snap, the replacement can start first, with the County’s permit application in by the end of the next working day, and Fairfax County Fire and Rescue’s fall advice, gas appliances inspected and a CO alarm on every floor, applies to a boiler as much as a furnace.