Tankless Water Heater Installation Cost in Illinois
$1,600 – $5,150We estimate tankless water heater installation in Illinois at $1,600 to $5,150 for a whole-house tankless unit replacing a tank. The national estimate is $1,400 to $4,400. Illinois plumber pay is 57% above the national median, ranking 2 of 51.
| Part of the job | Low | High |
|---|---|---|
| Parts and materials (our assumption) | $1,000 | $3,000 |
| Labor hours (our assumption) | 5 | 10 |
| Billed labor rate per hour | $120 | $216 |
| Estimated total | $1,600 | $5,150 |
Our estimate, not a quote. Billed rate is the Illinois median wage from BLS (2025, $48.05 an hour) times 2.5 to 4.5 to cover payroll costs, overhead, travel and profit. How we estimate
What our assumptions are based on
| Item | Sourced figure | Basis | Source |
|---|---|---|---|
| Labor hours | 4 – 10 | 4 to 8 hours (This Old House); 6 to 10 hours (Fixr). Bob Vila says close to 3 hours; that figure is not in this range. | This Old House, Fixr |
What other publishers report
| Publisher | Low | High | Scope |
|---|---|---|---|
| This Old House | $1,200 | $3,500 | Equipment and labor. Page dated June 2026. |
| Fixr | $2,500 | $4,500 | National average range, installed. Page dated January 2025. |
| Bob Vila | $1,333 | $3,721 | Installed, citing Angi and HomeAdvisor. Page dated October 2023. |
Cities in Illinois
| Metro area | Median wage | Low | High |
|---|---|---|---|
| Chicago | $49.70 | $1,600 | $5,250 |
Who can legally do this in Illinois
Individuals who plan, inspect, install, alter, extend, repair or maintain plumbing systems in Illinois must be licensed through the Illinois Department of Public Health.
Check a license with IDFPR Check License
Compared with neighboring states
| State | Median wage | Low | High |
|---|---|---|---|
| Indiana | $36.69 | $1,450 | $4,650 |
| Iowa | $30.72 | $1,400 | $4,400 |
| Kentucky | $30.84 | $1,400 | $4,400 |
| Missouri | $32.11 | $1,400 | $4,450 |
| Wisconsin | $39.04 | $1,500 | $4,750 |
Other plumber jobs in Illinois
- Toilet Replacement
- Faucet Replacement
- Drain Cleaning
- Garbage Disposal Replacement
- Water Heater Replacement
- Pipe Repair
- Whole-House Repipe
- Sewer Line Repair
Tankless Water Heater Installation cost in every state · Illinois home repair guide
Sources
General information, not professional advice. Conditions, codes and prices vary. Turn off power, gas or water before any work, and hire a licensed professional when in doubt. Cost figures are our estimates, not quotes.