Boiler Replacement Cost: Typical Ranges by Boiler Type
Boiler replacement cost depends on boiler type, near-boiler piping, venting, hot water and controls. See typical industry ranges for condensing, combi, cast-iron, steam and oil boilers, hidden costs and ways to save.
Boiler replacement cost is the total price to remove an old boiler and install a new one, including the boiler, venting, near-boiler piping, controls and labor. Typical industry ranges for common projects:
- High-efficiency condensing gas boiler: commonly runs about $9,000 to $16,000 installed.
- Combi boiler (heat plus hot water): typically ranges from about $8,000 to $15,000.
- Non-condensing cast-iron gas boiler: commonly runs about $7,000 to $12,000.
- Steam boiler: often about $8,000 to $15,000, more with major piping work.
- Oil boiler: commonly runs about $8,000 to $14,000, plus tank or chimney work if needed.
Piping, venting and hot water choices often move the price more than the boiler itself.
Key Takeaways
- Labor and piping are a big share. Boilers need custom near-boiler piping.
- Condensing boilers cost more up front. They also burn less fuel.
- Hot water choices change the total. Combi, indirect tank or keeping a separate heater.
- Venting can surprise you. Chimney liners and PVC runs vary widely.
- Get an itemized quote. Compare piping, venting, controls and removal line by line.
What Drives Boiler Replacement Cost?
| Factor | Why it matters | Effect on price |
|---|---|---|
| Boiler type | Condensing, combi, cast iron or steam | High |
| Near-boiler piping | Primary-secondary loops, steam headers | High |
| Venting | PVC for condensing, liner for chimney-vented | Medium |
| Domestic hot water | Indirect tank or combi adds cost | Medium |
| Controls and zoning | Outdoor reset, zone valves, circulators | Low to medium |
| Fuel | Gas vs oil, tank or line work | Low to medium |
| Access and removal | Heavy cast-iron boilers in tight basements | Low to medium |
Want a real number for your house? Request a written boiler replacement estimate and we will itemize the boiler, piping, venting and hot water.
Boiler Cost by Efficiency
Per DOE's guide to furnaces and boilers, older low-efficiency systems often run at 56% to 70% AFUE, while condensing systems reach 90% to 98.5%. ENERGY STAR certified gas boilers must reach at least 90% AFUE.
| Boiler | Typical AFUE | Typical installed range |
|---|---|---|
| Cast-iron gas, non-condensing | Low-to-mid 80s | About $7,000 to $12,000 |
| Condensing gas | About 90% to 95%+ | About $9,000 to $16,000 |
| Combi gas | About 90% to 95% | About $8,000 to $15,000 |
| Steam (gas or oil) | Low-to-mid 80s | About $8,000 to $15,000 |
A condensing boiler only reaches its rating when return water is cool. Homes with small radiators that need very hot water save less. See steam vs hot water boiler for how system type affects the choice.
Hidden Costs to Ask About
- Chimney liner, or fixing an orphaned water heater when the boiler leaves the chimney.
- Condensate neutralizer and drain for condensing boilers.
- System flushing and water treatment.
- New expansion tank, relief valve or fill valve.
- Replacing old zone valves or circulators.
- Oil tank replacement on older tanks.
- Permits and old boiler removal.
Ways to Lower Boiler Replacement Cost
- Replace before it fails to avoid emergency scheduling and rushed choices.
- Right-size the boiler with a heat loss or radiation survey.
- Combine hot water with a combi or indirect tank when your water heater is also old.
- Ask about incentives. Massachusetts homeowners may qualify for Mass Save incentives on some qualifying equipment; check masssave.com for current offers as of 2026.
Boiler vs Heat Pump Cost
Some homeowners compare a new boiler with ductless heat pumps, or pair a smaller boiler with mini-splits. Heat pumps add cooling, which a boiler cannot. See heat pump with boiler and baseboard heat and typical ranges in mini-split installation cost.
Get a Written Boiler Estimate
Boiler replacement cost depends on boiler type, piping, venting and hot water. Typical ranges help you plan, but a site visit gives a real number. For the full process, read our boiler replacement guide.
Jose has worked in HVAC since 2015. HomePros installs Burnham and Weil-McLain boilers with a load calculation on every job, and hauls the old one away. Get a free written boiler estimate, or call (781) 426-8428.
Looking for the complete guide?
Furnace and Boiler Replacement in Massachusetts: The Complete Guide