Tankless Water Heater Cost in Marietta, GA
A tankless water heater costs $2,164 installed on average in the Atlanta area, with most installations priced between $1,214 and $3,100. These figures come from HomeAdvisor’s Atlanta cost data (accessed October 2026).
Tankless water heater cost is the total price to buy and install an on-demand water heater: the unit, labor, gas or electrical work, venting and the permit. Marietta sits inside metro Atlanta, so Atlanta data is the closest published benchmark. Our tankless installation service for Marietta homes covers sizing and the full installation.
How Much Does a Tankless Water Heater Cost by Size?
A gas tankless water heater costs $1,500 to $2,900 installed in the Atlanta area, rising with the flow rate in gallons per minute (GPM). The table shows Atlanta prices from HomeBlue (January 2022).
| Gas tankless flow rate | Installed price, Atlanta |
|---|---|
| 5 to 6 GPM | $1,500 to $1,700 |
| 6 to 7 GPM | $1,600 to $1,800 |
| 7 to 8 GPM | $1,800 to $2,000 |
| 8 to 9 GPM | $1,900 to $2,200 |
| 9 to 10 GPM | $2,100 to $2,500 |
| 10 to 11 GPM | $2,400 to $2,900 |
A 10 to 11 GPM gas unit roughly replaces a standard 50-gallon tank, according to HomeBlue. These 2022 figures set a baseline. A current written quote gives the exact price.
Does an Electric Tankless Water Heater Cost Less Than Gas?
Yes. An electric tankless water heater costs less to buy and install than a gas unit of similar size. HomeBlue lists a 6 to 7 GPM electric unit at $1,700 to $1,800 installed in Atlanta. Large electric units draw high amperage, which adds an electrical panel or circuit upgrade in some homes.
What Does a Tankless Installation Price Include?
A tankless installation price includes 6 parts: the unit, removal of the old tank, mounting, water and fuel connections, venting or electrical work, and the permit.
- Tankless unit. Sized by the GPM the household uses at peak demand.
- Old tank removal. Draining and hauling away the storage tank.
- Wall mounting. Tankless units hang on a wall instead of sitting on the floor.
- Water and fuel connections. Water lines plus a gas line or electrical circuit.
- Venting or electrical work. Gas units need a dedicated vent. Electric units need adequate power.
- Permit. Cobb County or the City of Marietta issues the permit, depending on the address.
Why Does Switching From a Tank to Tankless Cost More?
Switching from a tank to tankless costs more because the home’s gas line, venting or electrical service often needs an upgrade. A gas tankless unit draws more gas at full output than a tank heater. The existing gas line and vent were sized for the tank.
| Conversion item | Why it adds cost |
|---|---|
| Larger gas line | A gas tankless unit needs more gas at full output |
| New vent | Tankless gas units need their own vent type |
| Electrical circuit or panel | Large electric units draw high amperage |
| Relocation | Moving the heater to a new wall adds pipe runs |
Replacing an old tankless unit with a new one costs less, because the gas line, vent and wiring are already in place.
Is a Tankless Water Heater Worth the Higher Cost?
A tankless water heater costs more up front than a tank, and it lasts longer and uses less energy. Tank replacement averages $1,361 in Georgia (HomeServe, September 2025), compared with $2,164 for tankless in the Atlanta area.
| Factor | Tank water heater | Tankless water heater |
|---|---|---|
| Installed price | $1,361 Georgia average | $2,164 Atlanta average |
| Expected life | 10 to 15 years (US DOE) | About 20 years (ENERGY STAR) |
| Efficiency | Baseline | 8% to 34% more efficient (US DOE) |
| Hot water supply | Limited by tank size | Continuous, limited by GPM |
A tankless unit lasting about 20 years outlives one to two tank heaters. Our full comparison of tank and tankless heaters for Marietta homes covers flow, space and fuel.
How Much Does Tankless Repair Cost?
Tankless water heater repair costs $571 on average in Atlanta, with most repairs priced between $220 and $852, according to HomeAdvisor (accessed October 2026). Yearly descaling keeps mineral buildup from shortening the unit’s life.
Are There Tax Credits or Rebates for Tankless Water Heaters?
No federal tax credit applies to tankless water heaters installed in 2026. The federal Energy Efficient Home Improvement Credit (Section 25C) ended for property placed in service after December 31, 2025, according to IRS Fact Sheet FS-2025-05.
Utility rebates are separate from the federal credit. Ask your gas or power company about current rebates for ENERGY STAR water heaters before buying.
Related Water Heater Guides
These guides cover the next questions after price:
- tank water heater replacement prices in Marietta
- what Marietta plumbers charge per hour
- Marietta, GA plumbing company
Frequently Asked Questions
How much does a tankless water heater cost in Marietta, GA?
A tankless water heater costs $2,164 installed on average in the Atlanta area, with most installations priced between $1,214 and $3,100 (HomeAdvisor, accessed October 2026).
Is gas or electric tankless cheaper to install?
Electric tankless units cost less to install than gas units, unless the home needs an electrical panel upgrade.
How long does a tankless water heater last?
A tankless water heater lasts about 20 years, according to ENERGY STAR. A tank water heater lasts 10 to 15 years.
Is there a federal tax credit for tankless water heaters in 2026?
No. The federal Section 25C credit ended for property placed in service after December 31, 2025.
Does a tankless installation need a permit in Marietta?
Yes. A tankless installation needs a permit from Cobb County or the City of Marietta, depending on the address. The plumber pulls the permit.
Get a Tankless Water Heater Price in Marietta
Ready for endless hot water? Call (770) 230-0611. Plumber Marietta GA sizes your tankless unit and gives a written price before work starts.