Water Heater Replacement in Prince William County & Manassas, VA

Woodbridge, Dale City, Lake Ridge, Manassas, Gainesville, Bristow and Haymarket. Prince William is mostly single-family homes and townhouses built from the 1980s to the 2000s, so many water heaters here are at or past the 10 to 15 years the Department of Energy gives a tank. A gas replacement needs a county permit ($119.85 in FY27); a same-size electric replacement in the same spot does not. We price all of it on one free, itemized estimate.

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Your itemized estimateFree, with every line priced before work starts
  1. The water heaterBrand, model, fuel and size, so you can compare quotes like for like
  2. Drain, disconnect and remove the old unitLabor for the swap
  3. Haul-awayThe old heater leaves with us
  4. Thermal expansion tankWhere your water system needs one
  5. Relief valve discharge pipeRun down to just above the floor
  6. Drain panWhere a leak would damage the room
  7. Gas shutoff and sediment trapGas units only
  8. Vent connectorChecked and replaced if it is undersized or corroded
  9. Water connectionsShutoff valve and connectors
  10. Permit and inspectionWhere the job requires one

Lines your house does not need are left off, and each line that stays has its price beside it.

Prince William at a glance: what affects your water heater

A county permit for gas units, moderately hard water in the east, and houses from the 1990s and 2000s reaching their first or second replacement.

Permit
Needed for gas water heaters; not needed for a same-size electric replacement in the same location. See Prince William permits.Source: Prince William County, Do I need a permit?
Water
Eastern Prince William, including Woodbridge and Dale City, gets Occoquan water that measured about 96 to 107 mg/L hardness in 2025, moderately hard on the USGS scale. Western areas range from soft to hard depending on the source.Source: Prince William Water, 2025 quarterly water analysis; Fairfax Water, Griffith plant 2025 analysis; USGS hardness scale
Gas
Washington Gas; Columbia Gas serves some areas of the county.Source: Washington Gas service territory
Housing
Prince William County: median home built in 1995; 55% detached houses and 27% townhouses; 74% owner-occupied; 54% heat with utility gas. City of Manassas: median home built in 1985; 71% owner-occupied.Source: U.S. Census Bureau, ACS 2020-2024 5-year (tables B25034, B25035, B25003, B25024, B25040)

What that means for a replacement in Prince William

Houses built in the 1990s and 2000s are now on their first or second water heater. Most already have the expansion tank, relief valve piping and drain pan in place, which keeps a like-for-like replacement simple; where any are missing, they go on the estimate as their own lines.

Many newer homes have a power-vent or direct-vent water heater instead of a chimney. A power vent needs an outlet and a clear vent run, and a switch to tankless means checking the gas supply and a new vent location before we price it.

About one home in four here is a townhouse, where the water heater often sits in a closet or a tight utility room. Tell us where yours is when you call and we will plan the access.

Rules and incentives that apply in 2026, including Dominion Energy and Washington Gas programs, are in our 2026 guide.

What a replacement includes

The heater, removal and haul-away of the old one, and whatever the house needs to run the new one safely and to code. Each numbered part is a numbered line on the estimate.

Parts of a gas tank water heater installationA gas storage water heater standing in a drain pan. Numbered parts: 1 the water heater, 4 the thermal expansion tank on the cold-water line, 5 the temperature and pressure relief valve and its discharge pipe ending just above the floor, 6 the drain pan, 7 the gas shutoff valve and sediment trap, 8 the vent connector, 9 the cold-water shutoff valve and water connections.
A gas tank install. 1 the heater, 4 expansion tank, 5 relief valve discharge, 6 drain pan, 7 gas shutoff and sediment trap, 8 vent connector, 9 water shutoff and connections.

Where in Prince William

Woodbridge, Dale City, Lake Ridge, Dumfries, Montclair, Triangle, Manassas, Manassas Park, Gainesville, Bristow and Haymarket. Woodbridge is about 20 miles from our Arlington office and Gainesville about 28.

ZIP codes 22191, 22192, 22193, 22025, 22026, 20109, 20110, 20111, 20112, 20136, 20155 and 20169. Inside the City of Manassas and Manassas Park the city issues the permit; tell us your address and we will confirm the office.

Other areas we install in

ArlingtonOur home county. Hard water, older houses, a chimney vent check on gas units.AlexandriaCity or county address, hard water, Old Town and Parker-Gray vent rules.FairfaxFairfax County and the City of Fairfax: Reston, McLean, Vienna, Springfield, Chantilly.Falls ChurchCity fuel-gas permit, Washington Aqueduct water, mostly pre-1980 homes.Loudoun CountyAshburn, Sterling, Leesburg. Newer homes, two gas utilities, propane in the west.Washington, D.C.All eight wards. A DOB permit on every replacement; rowhouse access and vents.Montgomery & Prince George's, MDSilver Spring, Bethesda, Rockville, Bowie. WSSC permits, hard Potomac water.

Water heater questions from Prince William homeowners

For a gas water heater, yes: the county requires a gas trade permit, $119.85 for one water heater on the FY27 schedule. Replacing an electric water heater with the same size in the same location does not need a permit.

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