Tankless Water Heater in Fairfax Station, VA

Signs a change is due

• The tank is past its expected service life and sits in a finished lower level
• The far bathroom waits a long time for hot water
• A large tub or several showers drain the tank
• An existing tankless unit shuts down or shows a code on busy mornings
• Scale on fixtures or a drop in hot water flow

Fairfax Station conditions

Fairfax Station is a mostly residential, unincorporated community in southern Fairfax County that began as a stop on the Orange and Alexandria Railroad. Homes tend to sit on bigger lots, and many have been expanded. That raises the two questions that matter most for tankless here: whether one unit can supply the combined flow of several bathrooms in winter, and how long hot water takes to travel from the mechanical room to the farthest tap.

Fairfax Water lists itself as the provider for county residents, supplying Occoquan Reservoir and Potomac River water. Its Potomac plant results show hardness of about 70 to 185 mg/L, averaging around 7.5 grains per gallon, so service valves and a yearly flush belong in the plan. Washington Gas serves most of the county, though not necessarily every street, so check whether your home has a gas bill before choosing a fuel. If you smell gas, leave first, then call 911 and Washington Gas at 844-WASHGAS (844-927-4427), option 1, from outside.

What drives the cost

• Gas pipe sizing for a high-input burner, or two units
• Recirculation for long runs to distant bathrooms
• Vent route and condensate drainage
• Electrical work for controls or an electric model in homes without gas
• Fairfax County permits: a Household Appliance permit for a gas heater replacement, a Residential Plumbing permit for new gas pipe

What happens when you call

You are connected with an independent plumber who works in Fairfax Station. Share the home's size, the number of bathrooms and where the heater, meter and panel are. The plumber checks the supply and vent options in person, files the permit with Land Development Services through PLUS (703-222-0801), and can explain whether one unit, two units or a unit with recirculation fits your house best. Homeowners own the water line from the Fairfax Water meter to the house, so any work on that line is on the private side.