Tankless Water Heater in Ashburn, VA

Is my Ashburn home a good fit for tankless?

Usually. Only about 2 percent of homes in ZIP 20147 were built before 1980, and most went up between 1990 and 2019. That means modern supply piping, basements or garages with room on a wall, and, in many single-family homes, a short path to an outside wall for a vent. Townhouses can be tighter: the heater often shares a closet with the furnace, and the vent may need to leave through a narrow back wall.

The bigger question is fuel. Loudoun County says Columbia Gas and Washington Gas each serve portions of the county, with propane where neither reaches. Your gas bill tells you which utility you have; if you have no gas bill, the home may be all-electric, and an electric tankless unit brings its own demands on the panel.

What permits does a tankless install need in Ashburn?

Ashburn is unincorporated, so Loudoun County Building and Development handles it. The County files residential gas, mechanical and plumbing trade permits as sub-records of a parent building permit, either in person at 1 Harrison Street SE in Leesburg or online through LandMARC. Plan review questions go to 703-777-0220. A plumber who works in Loudoun regularly will know which records the job needs.

What about water quality and scale?

Loudoun Water's Central System draws mainly from the Potomac River, using Goose Creek and its reservoirs as needed, and treats it at the Trap Rock facility; it also buys water from Fairfax Water. Chloramine is the disinfectant. For the hardness figure at your address, check Loudoun Water's annual water quality report. Whatever the number, a tankless unit should go in with service valves so it can be flushed, and most makers ask for that flush about once a year.

A note on gas safety

If you ever smell gas near the heater, leave the house first. Then call 911 and your gas utility from outside, using the emergency number printed on your gas bill. If the house runs on propane, call 911 and your propane supplier. Do not flip switches or try to find the leak yourself. A plumber can repair or extend gas piping once the utility has made the area safe, and can check the tankless unit's gas connection and vent while there.