How Much Does It Cost to Replace a Boiler?
$4,000 – $10,000
National average: $5,750 installed
Estimate your cost
Adjust the options for a tailored ballpark — figures and the regional adjustment are approximate estimates. Always confirm with local quotes before you budget.
Boilers heat much of the country’s older and colder housing through radiators and radiant floors. Replacing one costs $4,000 to $10,000 installed in 2026, averaging around $5,750, with efficiency and fuel type driving most of the range.
What you’re paying for
The boiler unit is the biggest line item, followed by labor and any piping or venting changes. Switching to a high-efficiency condensing boiler often means new venting and a condensate drain, which adds to the install. Controls, a thermostat, and permits round out the bill.
Cost by type
Efficiency and fuel set the price. The table below shows typical installed pricing across standard and high-efficiency models and the common fuel types.
Efficiency: how high to go?
Boiler efficiency is rated in AFUE. A high-efficiency condensing boiler (90%+ AFUE) extracts more heat from the same fuel, lowering bills — worth the premium in cold climates with long heating seasons. In milder regions, a standard-efficiency unit may be the better value since the fuel savings take longer to recoup.
Combi or standard?
A combi boiler handles both home heating and on-demand hot water in one unit, freeing up the space a separate water heater would occupy — popular in smaller homes. A standard boiler pairs with a separate water heater or indirect tank. Your home’s layout and hot-water demand decide which fits.
How to save on a boiler
- Match efficiency to your climate instead of automatically buying the top model.
- Get itemized quotes comparing the same type and size.
- Service it annually to maximize lifespan and efficiency.
- Check state and utility rebates for high-efficiency units.
| Component | Typical range | Notes |
|---|---|---|
| Boiler unit | $1,500 – $7,000 | — |
| Installation labor | $1,000 – $3,500 | — |
| Piping & venting | $500 – $2,500 | — |
| Controls & thermostat | $150 – $600 | — |
| Permit | $100 – $500 | — |
| Option | Typical range | Notes |
|---|---|---|
| Standard-efficiency | $2,200 – $7,000 | — |
| High-efficiency (condensing) | $4,000 – $10,000 | — |
| Gas boiler | $4,000 – $10,000 | — |
| Oil boiler | $4,800 – $9,000 | — |
| Propane boiler | $2,800 – $7,500 | — |
What affects the price
- Efficiency (AFUE) High-efficiency condensing boilers (90%+ AFUE) cost more upfront but lower fuel use.
- Fuel type Gas, oil, and propane boilers carry different equipment and installation costs.
- Size (BTU) Larger homes need higher-output boilers, which cost more.
- Combi vs. standard A combi boiler provides heat and on-demand hot water in one unit, changing the price and plumbing.
- Piping & venting Switching to a condensing boiler may require new venting and condensate drainage.
Frequently asked questions
- How much does it cost to replace a boiler?
- Most boiler replacements run $4,000–$10,000 installed, averaging about $5,750. Standard-efficiency units start lower; high-efficiency condensing boilers cost more.
- Boiler vs. furnace — what's the difference?
- A boiler heats water for radiators or radiant floor heat; a furnace heats air blown through ducts. They're different systems — replace like with like unless you're converting the whole heating system.
- Is a high-efficiency boiler worth it?
- In cold climates with heavy heating use, a 90%+ AFUE condensing boiler usually pays back through lower fuel bills. In milder areas the payback is slower.
- How long does a boiler last?
- Boilers last 15–25 years — often longer than forced-air furnaces. Annual servicing extends their life.
- What is a combi boiler?
- A combination (combi) boiler provides both space heating and on-demand domestic hot water from a single unit, saving space by eliminating a separate water heater.
- What are the signs I need a new boiler?
- Age past 15 years, rising heating bills, frequent repairs, uneven heat, leaks, or strange noises all point toward replacement.
How we estimate: ranges reflect typical U.S. pricing for materials and professional installation, compiled and cross-checked against the current (2026) industry sources listed below (see our data & methodology). Your actual cost depends on your location, project size, material grade, and local labor rates — always get multiple written quotes before you commit.
Sources
Cost ranges on this page were checked against current (2026) data from these industry sources: