Roswell is split between two water systems, the City of Roswell Water Utility and Fulton County, so check your bill before planning around water quality. The city issues trade permits for plumbing, and Atlanta Gas Light owns the gas pipes. Call the number on this page to be connected with a local plumber in Roswell.

What happens after you call
The call connects you with an independent plumber who works in north Fulton. Expect questions about the current heater, fuel, location and the number of bathrooms, and whether the house is on Roswell or Fulton County water. If you already have a tankless unit, the error code helps narrow the problem. For a new install, the visit covers the gas pipe from the meter, the vent route, a drain for condensate and an outlet for the controls.
What drives the price
- Gas line. Tankless burners pull far more gas at full fire, and pipe sized for a 1980s tank and furnace may need upsizing.
- Vent. A sidewall vent from a garage or basement is simpler than a long run through finished space.
- Condensate. High-efficiency units need a drain.
- Recirculation. Larger two-story homes often benefit.
- Permit. Roswell's building permit application lists plumbing among its trades, each requiring a subcontractor affidavit, business license, state license and photo ID.
Roswell conditions
Roswell grew from an 1850s textile mill town into an affluent suburb on the Chattahoochee. Its median home was built in 1989, and about 22% predate 1980. Older homes in the historic district may need a new vent route; most subdivision homes have a garage or basement wall close by.
Water depends on the address. The City of Roswell Water Utility serves part of the city, about 5,600 customers, from Big Creek with supplemental purchased water. Everyone else gets water from Fulton County, which treats Chattahoochee River water at the Tom Lowe plant. Both systems disinfect with chlorine and add fluoride, and neither report lists hardness, so a home test is the way to set a flush interval. All Roswell sewer is handled by Fulton County, even for homes on city water.
Atlanta Gas Light maintains the gas infrastructure in the area. If you smell gas, leave the house first, then call 911 and AGL at 877.427.4321 from a safe place.
Before the plumber arrives
- Check your water bill to see whether it is from Roswell or Fulton County
- Clear access to the heater and gas meter
- Note the heater's age from its label
- Think about an acceptable spot for an outside vent cap
Tankless Water Heaters questions in Roswell
Do I need a permit to switch to a tankless water heater?
Does chlorine in the water hurt a tankless heater?
Will a tankless unit work in an older house?
Why do I get a short burst of cold water from my tankless heater?
More plumbing services in Roswell
Tankless Water Heaters nearby
Helpful guides
Sources
- Roswell community profile
- Roswell housing by year built (ACS via Point2Homes)
- Mixed by address: City of Roswell Water Utility: water service in Roswell
- Roswell water quality report
- Fulton County 2026 water quality report
- Roswell building and plumbing permits
- Roswell building permit application
- Develop Fulton County: Infrastructure
- Roswell gas leak and emergency contact
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