Tankless Water Heater in Potomac, MD

Potomac's median home was built around 1977, and older farmhouses still stand among the larger suburban houses near Potomac Village. Montgomery County assigns every property a water and sewer service category, and some Potomac-area lots are planned for private wells and onsite systems rather than public service. Both facts matter for a tankless heater: big houses stretch flow requirements, and well water brings its own considerations.

What to do now

1. Confirm your water source. A WSSC bill means public water; no water bill usually means a private well.
2. Count your peak demand. Note how many showers, tubs and appliances might run together on a busy morning.
3. Measure the distance. If the farthest bath is a long way from the heater, ask about recirculation or a second unit.
4. Find the gas meter and panel. The plumber will check both for capacity.
5. If an existing unit is failing, record the error code and shut off the gas valve at the heater if water is leaking from the cabinet.
6. Smell gas? Get out first, then call 911 and Washington Gas at 844-WASHGAS (927-4427), option 1, from outside.

Signs and likely causes

Cost factors

• Single large unit versus two units in series or at opposite ends of the house
• Recirculation piping and controls
• Gas line upsizing from the meter for a high-input burner
• Sediment filtration or treatment if the house is on a well
• WSSC permit and inspection for gas and plumbing work

Where an older Potomac farmhouse has been added onto over the years, the plumbing can be a patchwork of eras, and finding a clean path for a new vent or a bigger gas line takes longer. Expect the plumber to walk the house before quoting rather than pricing it over the phone. If the home is all-electric, ask early whether the panel and service can handle an electric whole-house unit, because that answer often decides between electric tankless, a heat pump tank or staying with a standard tank.