Gas tank water heater replacement cost in Louisville, KY
Installed, 50 gallon, standard vent
A typical gas water heater (50 gallon, standard vent) costs about $2,050 installed in the Louisville area, 2% above the national figure, because plumbers here earn a median $36 an hour against $31 nationally.
Prices by size in Louisville
| Size | Low | Typical | High | National typical |
|---|---|---|---|---|
| 40 gallon, standard vent | $1,700 | $2,000 | $2,400 | $1,900 |
| 50 gallon, standard vent | $1,750 | $2,050 | $2,600 | $2,000 |
| 75 gallon, standard vent | $2,500 | $2,850 | $3,300 | $2,800 |
| 40 gallon, power vent | $2,450 | $2,800 | $3,200 | $2,750 |
| 50 gallon, power vent | $2,650 | $2,900 | $3,450 | $2,850 |
Local labor: what plumbers earn here
| Hourly wage | Louisville metro | United States |
|---|---|---|
| 25th percentile | $25 | $24 |
| Median | $36 | $31 |
| 75th percentile | $43 | $41 |
The Louisville market
Louisville Metro's Construction Review office requires a permit to install, repair or replace any mechanical system and issues a "Residential HVAC Replacement" permit. For 1-2 family homes the fee is $105 for the first system and $50 for each additional one, with three inspections included and extra inspections at $50. A Kentucky HVAC Master or Journeyman must be on site for the entire installation or repair. Permits go to licensed HVAC contractors holding a Kentucky HVAC Master license and a Metro HVAC Contractor's License, or to the owner in person with photo ID and recorded property documents. Water heater permit rules were not found, so confirm. DOE puts Jefferson County in mixed-humid zone 4A; EIA's 2020 survey found 49% of Kentucky homes heat with electricity, 43% with gas, and 84% have central air.
Electricity heats water in 65% of Kentucky homes, so many Louisville replacements are electric tank swaps. Matching the old tank's size and voltage keeps the job simple. Ask whether a larger tank would need a new breaker or wire. A gas water heater's venting and gas connection are licensed work. Kentucky's federally funded rebates were not yet available in October 2026, so price the heater without them and ask about haul-away.
Permits in Louisville
| Permit for this job | Not stated on the city pages we checked (source) |
|---|---|
| Fee | $105 for the first system, $50 for each additional system (1 & 2 family, new or replacement); each HVAC permit includes 3 inspections; additional inspections $50 (since Nov 1, 2022). Water heater fee: none found. |
| Who can pull it | HVAC: licensed HVAC contractor (KY HVAC Master + Metro HVAC Contractor's License) or the property owner in person with ID and recorded property documentation |
| Inspection | Yes |
Rebates in Kentucky
HEAR: announced, not open yet. HOMES: announced, not open yet. Source: Kentucky Office of Energy Policy (Energy and Environment Cabinet), checked October 13, 2026.
What these programs cover, and other states
Other systems in Louisville
- Gas tankless water heater
- Gas furnace
- Central air conditioner
- Heat pump (ducted, outdoor unit + air handler)
Gas tank water heater cost in other metros
Sources
- Louisville, KY permit source (water heater permit)
- Louisville, KY permit source (hvac permit)
- Louisville, KY permit source: 1&2 family HVAC $105 first system, $50 each additional; 3 inspections
- DOE Building America: Guide to Determining Climate Regions by County
- Kentucky Home Energy Rebates
- EIA RECS 2020: Highlights for space heating fuel in U.S. homes by state
- EIA RECS 2020: Highlights for space heating in U.S. homes by state
- EIA RECS 2020: Highlights for air conditioning in U.S. homes by state
- EIA RECS 2020: Highlights for water heating in U.S. homes by state
- BLS OEWS May 2025, Louisville/Jefferson County, KY-IN (47-2152 plumbers)
- DOE Consumer Water Heaters Final Rule TSD (Apr 2024), Table 8.2.7 (2022$); labor share from App. 8D (3.75 h + trip, $420 of $791)