Water Heater Replacement in Derwood, MD

Derwood is an unincorporated community just north of Rockville and southeast of Gaithersburg, near the Shady Grove Metro and the Intercounty Connector. About two-thirds of its homes went up in the 1980s, with a median build year of 1985, in neighborhoods such as Mill Creek Towne and Needwood Estates. Heaters in houses of that age tend to sit in basements or utility rooms where earlier swaps left a mix of valves, connectors and vent parts. WSSC Water provides water and sewer service. It is responsible for the service line up to the property line, and the homeowner owns the rest into the house.

First steps if the heater fails

1. Turn off the heater's fuel: gas control to off, or the electric breaker off.
2. Close the cold water inlet valve, or the main shutoff if that valve is seized.
3. Run a hot tap briefly to relieve pressure in the tank.
4. Protect flooring and stored items from the leak.
5. Take a photo of the data plate for the plumber.
6. A gas smell changes everything: get out, then call 911 and Washington Gas at 844-WASHGAS (844-927-4427), option 1, once you're outside.

Common symptoms

What changes the cost

• Choice of tank size, fuel and efficiency
• Switching to tankless or heat pump, with any gas, vent or circuit upgrades
• The WSSC permit and inspection
• Code items such as an expansion tank, pan or relief valve discharge
• Basement stairs or tight closets
• Disposal of the old unit

Ask for a written, itemized quote so you can compare plumbers fairly. Many 1980s installs were done before expansion tanks and pans were routine, so expect those to come up. If the household has changed since the house was built, this is also the moment to rethink tank size rather than simply matching the old label.