Boiler repair and replacement in Catlett.

The Census counts 1,040 owner homes in ZIP 20119, all of them detached, and no owner home on utility gas: just over half run on electricity and close to three in ten on propane. So a hot water boiler here burns propane, and the tech checks its gas pressure against the propane setting on the boiler’s data plate, not natural gas numbers.

The typical house went up in 1990, but more than four in ten are older than 1980, and those are the houses with radiators or baseboard. Close to one in five homes here is rented, and in a rental the boiler is the landlord’s to keep up, so the landlord books the visit.

Fauquier County wants a permit to replace any fuel-fired appliance, a propane boiler included, even in the same spot, and that permit comes from the County’s Department of Community Development in Warrenton. A condensing or combi boiler, at $12,782 to $16,500 installed, gives up the chimney and exhausts through the wall in plastic pipe. Much of Catlett is on FCWSA water from two drilled wells, 264 and 270 feet deep, pumped to a tower on Old Dumfries Road whose height sets the pressure; that’s the supply the boiler’s fill valve draws from.

The County’s building code designs heating for a 17 degree day, and NOAA’s Warrenton 3 SE station counts about 98 nights a year at 32 degrees or below. Late January 2026 brought wind chills of 0 to 10 below across the Piedmont. A boiler that coasts through a mild night shows its age on those, which is why the tune-up belongs in the fall, while there’s still time to order a part. Warrenton 3 SE hit 3 degrees in January 2014 and 2 degrees in February 2015. Catlett also sits on Cedar Run, whose gauge in the village crested at 18.2 feet in July 2013 and 16.43 feet in April 2014, past the 15-foot minor flood stage where water reaches the low spot on Flatwood Lane.