Grayson has some of the newest housing in the metro, so most homes can take a tankless water heater with little rework. Gas for city residents comes through the City of Lawrenceville, not Atlanta Gas Light, and Gwinnett County supplies soft water. Call the number on this page to be connected with a local plumber in Grayson.

Who supplies gas to a Grayson home?
Grayson's New Resident page says natural gas for city residents comes through City of Lawrenceville Utilities. That matters for a tankless install in two ways. First, if a larger burner needs a bigger meter, the request goes to Lawrenceville's gas department. Second, a gas leak goes to Lawrenceville's emergency line: leave the house first, then call 911 and the City of Lawrenceville at 770-963-3332 from a safe spot. Confirm the utility on your gas bill, since a few addresses around Grayson may differ.
Is a new Grayson house ready for tankless?
Mostly. Grayson grew from 765 residents in 2000 to 4,730 in 2020, and its median home was built in 2012. Under 4% of homes predate 1980. Builders in that era often put the water heater in a garage or a basement mechanical room, and those spots usually have an outside wall close by for venting. The things a plumber will still check are the gas pipe size from the meter (builders size it for the appliances installed, not for a future tankless unit), the vent length, a drain for condensate, and an outlet for the controls. Large two-story plans may also call for recirculation so the upstairs bath is not waiting on hot water.
What does Gwinnett water mean for maintenance?
Gwinnett County Department of Water Resources is the water utility for the city. It draws from Lake Lanier and treats water at the Shoal Creek and Lanier plants, disinfecting with chlorine. Gwinnett reports total hardness of about 1.05 to 1.87 grains per gallon, averaging 1.34, which counts as soft. Soft water slows scale buildup in a heat exchanger, so a softener is rarely needed for the heater's sake, though most makers still recommend a yearly flush.
Building permit applications go through the city's online portal (iWorQ), and City Hall is at 475 Grayson Parkway. Whether a standalone heater swap uses the same portal is not stated, so the plumber should confirm with City Hall.
Local note
Because so many Grayson homes were built in the same few years, their original tanks are reaching the same age together. Planning a tankless switch before the tank leaks avoids a rushed decision.
Tankless Water Heaters questions in Grayson
Does a city-owned gas system change anything for a tankless install?
Should I add a water softener before going tankless?
Do I need a permit to switch to a tankless water heater?
Does a gas tankless heater work during a power outage?
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