Boiler repair and replacement 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.