How Much Does Expansion Tank Installation Cost?
Average cost: $175 | Range: $100 – $300
Average Cost
$175
Low End
$100
High End
$300
Time Required
30 min - 1 hour
What Affects the Price?
Expansion tanks are often required by code when a check valve or pressure reducing valve is present. They protect against thermal expansion in your water heater and are typically installed during heater replacement.
Key Cost Factors
- Tank size
- Pressure setting
- Location on cold line
DIY vs. Professional
DIY
This service requires a licensed plumber. DIY attempts risk additional damage or safety hazards.
Professional
Licensed plumbers ensure code compliance, warranties on work, and liability coverage.
Cost: $100 – $300
Cost by State (Sample)
| State | Low | High | Avg |
|---|---|---|---|
| Alabama | $88 | $264 | $154 |
| Alaska | $135 | $405 | $236 |
| Arizona | $97 | $291 | $170 |
| Arkansas | $85 | $255 | $149 |
| California | $145 | $435 | $254 |
| Colorado | $110 | $330 | $193 |
| Connecticut | $125 | $375 | $219 |
| Delaware | $108 | $324 | $189 |
| Florida | $102 | $306 | $179 |
| Georgia | $95 | $285 | $166 |
Frequently Asked Questions
Always Get 3 Quotes
Plumbing prices vary by 20–50% between contractors. Getting multiple quotes is the single best way to avoid overpaying.
How to Find a Good Plumber →Home Warranty Coverage
A home warranty may cover expansion tank installation for a flat service fee instead of the full repair cost.
Compare Warranties