Water heater repair in Alexandria, VA

Fairfax Water through Virginia American Water

Alexandria does not run its own water plant. Virginia American Water owns the pipes and meters inside the city and buys treated water wholesale from Fairfax Water, which draws from the Potomac River at the Corbalis plant near Great Falls and from the Occoquan Reservoir at the Griffith plant near Lorton. Depending on demand and maintenance, the water reaching a house in Rosemont may come mostly from one source or a blend of both.

Potomac water picks up minerals as the river crosses limestone valleys upstream, and the result is moderately hard water that leaves a gritty layer in tank bottoms and a white crust inside tankless heat exchangers. Winter inlet temperatures fall to around 40°F, so the burner on a basement gas tank runs long and hard from December into March, which is when weak thermocouples and tired gas valves give out.

Old Town cellars to West End towers

Old Town's brick and frame rowhouses, some dating to the late 1700s, line streets like Prince, Duke, Queen and Cameron. Their cellars are shallow, often with stone walls and dirt or brick floors, and the water heater is wedged under a staircase or in a front vault. Ceilings can be barely six feet, which limits tank height and rules out some taller high-efficiency models. Parker-Gray, north of King Street, has smaller rowhouses and frame homes with similar cramped cellars.

Del Ray and Rosemont are known for 1910s to 1930s bungalows and foursquares, most with full basements where the heater stands near the furnace and the original chimney. Beverley Hills, Seminary Hill and Taylor Run have larger midcentury houses, frequently with finished basements built around the utility corner.

The West End, around Landmark, Seminary Road and Eisenhower Avenue, is dominated by apartment and condo towers, plus newer townhouse communities like Cameron Station and the rowhouses at Potomac Yard. In condos, a 40-gallon electric heater usually sits in a closet next to the air handler, and a leak there runs straight into the unit downstairs.

Flood-prone streets and winter weather

Low streets near the Old Town waterfront, especially around King, Union and the Strand, take on water during strong tides, nor'easters and Potomac storm surges, and cellars a block or two from the river can flood. Inland, intense summer cloudbursts have overwhelmed storm sewers in Del Ray, Rosemont and the Four Mile Run area in recent years, filling basements with sewage backup and runoff. The city has responded with a long-term stormwater and flood mitigation program, but individual homes still flood.

If water reached a gas heater's burner chamber or control valve, the unit needs to be replaced, not dried out and relit. Electric tanks that sat in water need a full inspection of the elements, thermostats and wiring before power is restored.

Winters bring stretches in the teens, and cellars with stone foundations and leaky bulkhead doors let enough cold in to freeze supply lines. Summer humidity, meanwhile, keeps those same cellars damp enough to rust gas connectors and tank jackets.

The problems plumbers see most in Alexandria

• Cramped cellar replacements in Old Town and Parker-Gray, where tank height and stair width set the limits.
• Flooded burners and controls after waterfront high water or summer sewer backups.
• Orphaned chimney flues in Del Ray and Rosemont basements after furnaces were replaced with high-efficiency models.
• Condo closet leaks in West End high-rises that damage units below.
• Sediment buildup from moderately hard Potomac water in tanks that have never been drained.
• Worn gas valves and thermocouples on aging basement heaters that run hard all winter.

Typical water heater prices in Alexandria

Northern Virginia labor costs top most of the Commonwealth. Old Town jobs carry extra costs for metered parking, narrow cellar stairs and carrying tanks through finished living space, while condo work may require scheduling a freight elevator with building management.

Permits, licensing and condo rules

DPOR, Virginia's licensing agency, credentials plumbing and gas fitting tradesmen and contractors, and contractors need a Board for Contractors license with the right specialty. In Alexandria, the city's Department of Code Administration issues the permit for a replacement heater and inspects the finished work.

Condo buildings in the West End and at Potomac Yard often have their own rules about which plumbers may work in the building, proof of insurance, approved heater models and mandatory drain pans. Check with the management office before the plumber arrives, and keep the permit card for the association's records.

Houses in the Old and Historic Alexandria District face Board of Architectural Review oversight for visible exterior changes, which can matter when a tankless conversion needs a new vent through a front or side wall.

Gas, power and venting decisions

Washington Gas supplies natural gas to most single-family homes in Alexandria, and Dominion Energy Virginia provides electricity. Many high-rise condos and some newer townhouses have no gas service at all, so their heaters are electric by default.

Venting is the trickiest part of many Del Ray and Rosemont jobs. When a furnace is upgraded to a sealed high-efficiency model, the old water heater is left alone in a masonry chimney sized for two appliances. Exhaust can cool, condense and fail to rise, which shows up as rust at the draft hood or a damp patch on the chimney. The fix may be a stainless liner, a power-vented heater or a move to a direct-vent model.

In Old Town cellars, a short tank or a wall-hung tankless heater sometimes is the only option that fits under the joists. Tankless conversions must meet clearance rules from windows and property lines, which can be hard to satisfy on a rowhouse with a shared wall on each side.

Upkeep in a Potomac-fed home

Because hardness varies with the source blend, Alexandria homeowners should drain a couple of gallons from the tank twice a year and watch for grit. A tank that pops and crackles while heating has a sediment layer that is worth having a plumber drain and flush completely. Tankless owners should plan on an annual descale.

If your home sits near the waterfront or in a part of Del Ray or Arlandria that has flooded before, raise the heater on a sturdy stand, install a backwater valve on the sewer line if your plumber recommends one, and put a leak sensor on the floor. Those steps cost little compared with replacing a heater after a storm.

Around Alexandria

Many homes with an Alexandria mailing address are actually in Fairfax County, including Huntington, Belle View, Mount Vernon, Franconia and Kingstowne. Those homes buy water directly from Fairfax Water and pull permits through Fairfax County's Land Development Services, not the city. Arlington borders Alexandria to the north with its own county water system, and Springfield and Lorton to the south fall under Fairfax County as well.

Water heater questions from Alexandria