Boiler replacement cost by fuel type
| Boiler type | Installed price | Good to know |
|---|---|---|
| Natural gas boiler | $4,000–$9,000 | The most common replacement |
| High-efficiency (condensing) boiler | $4,000–$11,000 | Costs more up front; condensing models need different venting |
| Oil boiler | $3,300–$9,000 | Oil systems also need a tank and filters |
| Propane boiler | $2,800–$7,500 | Priced the same in both guides that list it |
| Electric boiler | $1,800–$8,000 | Lowest install cost in these guides |
These prices cover the boiler and installation labor, with the labor share adjusted for your state. Venting, piping, controls and the permit are separate lines in the calculator. Switching fuel type, or moving from a standard to a condensing boiler, usually changes the venting and can change the piping, which is where quotes start to diverge.
What changes the price
The biggest drivers in the guides are the fuel type, the efficiency rating and the size of the house. Condensing boilers cost more than standard ones but need a plastic vent and a condensate drain, which can mean a chimney liner or new piping when you replace an older unit. Radiators, baseboard and in-floor systems also differ in how much zone and pump work is needed.
Extra costs to expect
| Item | Typical cost | When it applies |
|---|---|---|
| Chimney liner | $600–$2,500 | When the vent changes, often with a condensing boiler |
| New piping and connections | $450–$1,800 | When the old piping does not fit the new unit |
| Zone valves, pump or controls | $300–$1,200 | Multi-zone systems |
| Thermostat | $100–$300 | Upgrading controls |
| Oil tank and filters | $1,000–$5,000 | Oil boilers only |
| Permit | $50–$300 | Usually required; amount varies by town |
None of the current guides we read puts a dollar figure on removing the old boiler, so ask whether removal and disposal are in the quote. Ask also whether the installer sizes the boiler with a heat-loss calculation rather than simply matching the old unit.
Questions to ask before you hire
- Is the quote for the boiler, labor, venting, piping and permit together?
- Was the new boiler sized with a heat-loss calculation?
- Will the chimney need a liner or the vent need to change?
- Is old-boiler removal included, and what warranty covers parts and labor?
- Is the installer licensed for the fuel type in your state?
Methodology and sources
We price each boiler type as an installed total, adjust the labor share for your state's HVAC technician wages, and price venting, piping, controls and the permit separately. Read how we estimate costs.
- HomeAdvisor: install a boiler — boiler types and installed prices
- HVAC.com: boiler replacement cost — fuel types, piping, thermostat, labor
- PickHVAC: boiler replacement cost — chimney liner, zone valves, oil tank, labor split
- Angi: boiler installation cost — permits, thermostat
- BLS OEWS May 2025, State (SOC 49-9021, Heating, Air Conditioning, and Refrigeration Mechanics and Installers) — state labor index, an HVAC proxy
What each source reports
Our estimate does not rely on any single page. This table lists each page we used and the figures it reports, so you can see where the ranges come from.
| Source | What it reports |
|---|---|
| HomeAdvisor |
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| HVAC.com |
|
| PickHVAC |
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| Angi |
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Common questions about boiler replacement costs
How much does boiler replacement cost?
A typical job (natural gas boiler, with permit) comes to about $6,180 nationally, within a range of $4,050 to $9,300. Use the calculator above to adjust for your state, the options you choose and any extras.
How much does a gas boiler replacement cost?
A natural gas boiler comes to about $4,050–$9,300 installed with a permit, and a high-efficiency gas boiler to about $4,050–$11,300.
How much does an oil boiler replacement cost?
An oil boiler comes to about $3,350–$9,300 installed with a permit.
What about steam boilers?
The ranges on this page are not split by steam and hot-water systems. Ask your installer which type you have and for a written quote that lists piping, controls and venting separately.
Where do these prices come from?
They come from 4 published cost pages from 4 publishers, last checked Oct 8, 2026. We report what those pages say and do not invent figures; the table above shows each source.
How does my state change the estimate?
The labor part of the price is scaled by the average wage for the relevant trade in your state, using Bureau of Labor Statistics data. Materials and equipment are not adjusted.
Why might a contractor's quote differ from this estimate?
A quote reflects your specific scope, access, local demand and what the contractor includes. Ask for line items rather than a single total so you can compare bids on the same basis.
All 4 sources behind these prices
Every figure in the calculator comes from one or more of these pages, with the number each one supports in the link text.
- HomeAdvisor: a gas boiler installed $4,000-$9,000 (updated Jun 2026)
- HVAC.com: natural gas boilers $4,000-$9,000 (Nov 2025)
- PickHVAC: a simple gas condensing swap in a 1,500-2,000 sq ft home $4,000-$9,000 (May 2026)
- Angi: thermostat replacement $175 on average and up to $300 for smart models (updated Aug 2026)