Tankless Water Heater in Arlington, VA

When a tankless heater starts to make sense

• The tank in the basement or utility closet is getting old, and you would rather plan the change than wait for a leak
• Back-to-back morning showers leave the last person with lukewarm water
• A closet in a Clarendon or Pentagon City unit has no spare room for a 50-gallon tank
• An existing tankless unit throws error codes, or its flow has faded over the last few winters
• You are already reworking gas piping or a furnace and want the water heater settled at the same time

Arlington conditions that shape the install

Arlington County's Water, Sewer, Streets Bureau delivers Potomac River water treated by the Washington Aqueduct at the Dalecarlia plant. The County lists hardness at 8 grains per gallon (142 mg/L). That is moderately hard, enough to coat the inside of a heat exchanger over a few years, so ask for isolation valves with service ports so the unit can be flushed without cutting pipe. The County disinfects with chloramine and switches to chlorine for about six weeks each spring while it flushes its mains.

The median Arlington home was built in 1976, and many still run on gas piping sized for a tank and a furnace, not a tankless burner at full fire. Older houses off Route 50 and near Cherrydale may also lack a short path to an outside wall for the vent. Washington Gas supplies gas here. If you ever smell gas, leave the house first, then call 911 and Washington Gas at 844-WASHGAS (844-927-4427), option 1, once you are outside.

What drives the price

• Gas supply. Measuring the run from the meter often shows a bigger line is needed.
• Vent route. A short sidewall vent from a basement costs less than a run through finished rooms.
• Condensate. High-efficiency units need a drain for acidic condensate, ideally near a floor drain.
• Power. Gas tankless units still need an outlet for their controls and fan.
• Permit and inspection. Arlington County handles plumbing, gas and water heater permits through the Permit Arlington portal.

What happens when you call

The call connects you with an independent plumber who works in Arlington. Have the age and size of your current heater, the number of bathrooms and the heater's location ready. Expect the plumber to check the gas meter, the vent options and the space before quoting, and to tell you plainly if a new tank would suit the house better.