Tankless Water Heater in Derwood, MD

Derwood is an unincorporated community between Rockville and Gaithersburg, close to the Shady Grove Metro, with a median build year around 1985. Houses from that decade usually have a basement or garage utility space and gas piping sized for a tank, so the main tankless questions are gas supply and vent route. If you already own a tankless unit and it has stopped behaving, start with the steps below.

What to do now

1. Read the display. Write down the error code and the model number from the label.
2. Reset power. Check the breaker or plug; the controls and fan need electricity even on a gas unit.
3. Check other gas appliances. If the range won't light either, the issue is upstream of the heater.
4. Clean the inlet screen if you're comfortable shutting off water to the unit; a clogged screen cuts flow.
5. Check the vent terminal outside for leaves, ice or nests.
6. Smell gas? Leave the house. From outside, call 911 and Washington Gas at 844-WASHGAS (844-927-4427), option 1.

Signs and likely causes

Cost factors

For a new tankless install in a Derwood home, the price turns on whether the gas pipe from the meter needs upsizing, how far the vent has to run, and whether an outlet or circuit needs to be added. A recirculation pump adds cost but cuts the wait at far fixtures. The WSSC permit and inspection are part of every gas heater job. For repairs, cost depends on the part, from an inexpensive sensor to a heat exchanger, and whether a descaling flush is due; WSSC water hardness varies by treatment plant, so a yearly flush is a sensible routine. If the unit is near the end of its expected life and needs a major part, compare that repair bill against a new heater before deciding; a plumber can lay out both numbers on the same visit.