Gas tankless water heater replacement cost in Chicago, IL
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 $3,150 installed in the Chicago area, 13% above the national figure, because plumbers here earn a median $50 an hour against $31 nationally.
Prices by size in Chicago
| Size | Low | Typical | High | National typical |
|---|---|---|---|---|
| About 150,000 BTU (1–2 bathrooms) | $2,250 | $3,000 | $3,950 | $2,650 |
| About 180,000–199,000 BTU (2–3+ bathrooms) | $2,750 | $3,150 | $4,300 | $2,800 |
Local labor: what plumbers earn here
| Hourly wage | Chicago metro | United States |
|---|---|---|
| 25th percentile | $36 | $24 |
| Median | $50 | $31 |
| 75th percentile | $59 | $41 |
The Chicago market
Chicago's Department of Buildings handles these swaps through its Express Permit Program, which lists repairing or replacing an existing hot water heater and mechanical (HVAC) work. The fee excerpt shows $75 per dwelling unit for an in-kind water heater and $75 per equipment type per dwelling unit for in-kind heating or cooling equipment, rising to $150 for new AC equipment. A city-licensed contractor is required on every application, though an owner who lives at the address can do their own plumbing with Form 401 and ID. One wrinkle: the contractor must click a link in an emailed request to accept the job before the permit issues. The city pages checked do not describe inspections, so ask. EIA counts furnaces as the main heat in 76% of Illinois homes. Suburban Cook, DuPage and the Indiana counties have separate rules.
A tankless unit rarely drops into the old water heater's spot unchanged. It needs its own vent, usually through a side wall, and a gas line sized for a much bigger burst of input. In older two-flats the shared chimney may then serve only the furnace, which can leave it oversized. Ask the plumber to address the remaining appliance's venting in writing. Chicago winters chill the water coming in from the street, so ask what flow rate the unit holds in January.
Permits in Chicago
| Permit for this job | Yes (source) |
|---|---|
| Fee | $75 per dwelling unit for repair or in-kind replacement of a hot water heater (individual equipment); $75 per equipment type per dwelling unit for in-kind replacement of heating, cooling or air-handling equipment; $150 for new AC equipment. |
| Who can pull it | Chicago-licensed contractor required on every application; owner-occupant may do own plumbing with Form 401 (Owner as contractor) and ID |
| Inspection | Not stated on the city pages we checked |
Rebates in Illinois
HEAR: announced, not open yet. HOMES: announced, not open yet. Source: Illinois EPA Office of Energy, checked October 13, 2026.
What these programs cover, and other states
Other systems in Chicago
- Gas tank water heater
- Gas furnace
- Central air conditioner
- Heat pump (ducted, outdoor unit + air handler)
Gas tankless water heater cost in other metros
Sources
- Chicago Express Permit Program: plumbing work
- Chicago Department of Buildings: Express permits
- Chicago permit fee excerpts (14A)
- Illinois EPA: Home energy rebates
- EIA, 2020 RECS: Highlights for space heating in U.S. homes by state
- EIA, 2020 RECS: Highlights for water heating in U.S. homes by state
- EIA, 2020 RECS: Highlights for air conditioning in U.S. homes by state
- BLS OEWS May 2025, Chicago-Naperville-Elgin, IL-IN (47-2152 plumbers)
- DOE Gas-fired Instantaneous Water Heaters Final Rule TSD (Dec 2024), Table 8.2.6 (2023$)