Water heater replacement in Fairfax, VA
Fairfax Water Heaters helps homeowners in the City of Fairfax and in Fairfax County neighborhoods that share a Fairfax mailing address plan a water heater replacement or installation. The two places are easy to mix up, and they do not use the same permit office.
City of Fairfax or Fairfax County?
The City of Fairfax is an independent city with its own Code Administration and permit portal. Fairfax County is a much larger jurisdiction (Springfield, Reston, Herndon, Burke, McLean, and many “Fairfax, VA” addresses) and uses the county’s PLUS system.
- In the county, a gas water heater needs a permit even for a like-for-like swap — usually a Household Appliance permit in PLUS if no new gas piping is added. County HAPL page.
- In the city, a gas water heater needs a gas permit and a plumbing permit; an electric water heater needs electrical and plumbing permits. City gas permit.
If you are not sure which you are in, say so on the form and include the ZIP. The permits guide walks through the difference, and through extra Town of Vienna or Clifton approvals when those apply. We walk you through the permit steps.
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How Fairfax-area homes usually sit
A lot of mid-century Fairfax County houses have a tank in a basement or a garage, with an atmospheric gas vent into a shared chimney — those jobs often turn on whether the existing vent still works with a modern unit, and on a chimney vent certification. Newer townhomes and some city lots put the heater in a tight closet, where pan drains, combustion air, and door width matter as much as the model number.
Fairfax Water’s moderately hard water (typically 5–10 grains per gallon) is the same system most of this county drinks from, so sediment in tanks and scale in tankless units are ordinary facts of life here, not a surprise.
Source: Fairfax Water, retrieved 2026-11-13.
Services and guides
- Full replacement — tank, tankless, gas, or electric / heat pump
- Repair or replace
- Cost ranges (typical regional figures, not a bid)
- If the heater is leaking
Nearby areas
- Arlington
Homes, townhouses, and condos - Alexandria
City of Alexandria and county addresses - Woodbridge
Prince William County - Springfield
Franconia and Kingstowne - Reston and Herndon
Western Fairfax County
FAQ
Do you cover both the City of Fairfax and Fairfax County?
Yes — and we walk you through the permit steps for the jurisdiction that actually applies to the address.
I have a Fairfax mailing address and a Vienna-adjacent neighborhood. Does that change anything?
If the property is in the Town of Vienna (or Clifton), Fairfax County PLUS still applies for many jobs, but the town’s own approval has to be uploaded to the county record. Tell us the town name, not just the ZIP.