Gas tankless water heater replacement cost in Philadelphia, PA
Installed, About 180,000–199,000 BTU (2–3+ bathrooms)
A typical tankless water heater (About 180,000–199,000 BTU (2–3+ bathrooms)) costs about $2,900 installed in the Philadelphia area, 4% above the national figure, because plumbers here earn a median $36 an hour against $31 nationally.
Prices by size in Philadelphia
| Size | Low | Typical | High | National typical |
|---|---|---|---|---|
| About 150,000 BTU (1–2 bathrooms) | $2,150 | $2,750 | $3,750 | $2,650 |
| About 180,000–199,000 BTU (2–3+ bathrooms) | $2,650 | $2,900 | $4,100 | $2,800 |
Local labor: what plumbers earn here
| Hourly wage | Philadelphia metro | United States |
|---|---|---|
| 25th percentile | $29 | $24 |
| Median | $36 | $31 |
| 75th percentile | $50 | $41 |
The Philadelphia market
Philadelphia's Department of Licenses and Inspections requires a plumbing permit for replacement work, and water heater permits may be issued immediately when a contractor applies. Replacing appliances in a one- or two-family home qualifies for a mechanical EZ permit. Any owner or authorized agent may apply, but a licensed master plumber must oversee plumbing and a licensed contractor must perform mechanical work. A Certificate of Approval follows the required inspections, and boilers are regulated by the Pennsylvania Department of Labor and Industry. Fees run $31 for a water heater in a one- or two-family home, $69 per separately submitted mechanical appliance, a $100 filing fee credited toward the permit and small City and State surcharges. Rowhouse stock means mixed systems: EIA found 19% of Pennsylvania homes heat with a boiler and 6% heat water with oil. Camden, Wilmington and the suburban counties have separate permit offices.
Rowhouse basements are narrow, and a gas tankless unit needs a vent that exits through a wall with proper clearance from windows and the neighbor's property, which some party-wall layouts cannot provide. Ask the plumber to confirm the vent exit point and gas pipe size during the estimate, well before installation day. A wall-hung unit does free up floor space in a cramped basement, which some owners value more than the energy savings.
Permits in Philadelphia
| Permit for this job | Yes (source) |
|---|---|
| Fee | Water heater: $31 (1-2 family) or $37; mechanical appliance submitted separately $69 each in 1-2 family ($158 otherwise); direct-vent/flue-connected heating unit $69 in 1-2 family; $100 non-refundable filing fee credited to permit fee; surcharges $3 City + $4.50 State per permit. |
| Who can pull it | Owner or authorized agent may apply, but work must be done/overseen by a licensed master plumber (plumbing) or licensed contractor (mechanical) |
| Inspection | Yes |
Rebates in Pennsylvania
HEAR: announced, not open yet. HOMES: announced, not open yet. Source: PA DEP Energy Programs Office, checked October 13, 2026.
What these programs cover, and other states
Other systems in Philadelphia
- Gas tank water heater
- Gas furnace
- Central air conditioner
- Heat pump (ducted, outdoor unit + air handler)
Gas tankless water heater cost in other metros
Sources
- City of Philadelphia: Get a plumbing permit
- City of Philadelphia: Get a mechanical permit
- Philadelphia L&I Water Heater Replacement Certification Form
- Pennsylvania DEP: Inflation Reduction Act home energy rebates
- EIA, 2020 RECS: Highlights for space heating in U.S. homes by state
- EIA, 2020 RECS: Highlights for water heating in U.S. homes by state
- EIA, 2020 RECS: Highlights for air conditioning in U.S. homes by state
- BLS OEWS May 2025, Philadelphia-Camden-Wilmington, PA-NJ-DE-MD (47-2152 plumbers)
- DOE Gas-fired Instantaneous Water Heaters Final Rule TSD (Dec 2024), Table 8.2.6 (2023$)