New Boiler Cost: $3,605 to $8,448 + Combi Prices (2026)

Installed prices. The two guides price combi boilers differently; ask each company to quote the same model and output.

How much does a new boiler cost

A new boiler costs $5,911 on average in HomeAdvisor's 2026 data, with a normal range of $3,605 to $8,448. HomeGuide puts the average range at $3,200 to $9,000 installed, a national average of $6,100, and extremes of $1,500 to $12,000. HomeGuide splits that into $1,400 to $6,500 for the unit and $1,200 to $3,200 for labor and fitting. HomeAdvisor puts installation labor at $100 to $250 an hour.

Cost to replace a boiler by fuel

Gas boilers cost $4,000 to $9,000 installed in both guides. Oil, propane and electric units fall in similar or wider ranges:

Installed prices. Switching fuels adds tank, line or electrical work.

Combi boiler cost

A combi boiler costs $6,000 to $10,000 installed in HomeGuide's guide; HomeAdvisor lists combination boilers at $2,600 to $7,000. A combi heats the house and makes hot water on demand, so it can replace both a boiler and a water heater. If you keep a separate tank, HomeGuide puts a hot water tank with installation at $1,200 to $4,000; see water heater replacement cost and tankless water heater installation to compare.

New boiler cost by home size

A boiler for a 1,000 square foot home costs $4,000 to $6,200 installed and one for 3,000 square feet costs $6,100 to $10,000, according to HomeAdvisor.

HomeGuide's rule of thumb is 25 to 50 BTU per square foot, 50 or more in northern climates and 20 to 35 in southern ones. A load calculation is more accurate.

Condensing vs non-condensing boilers

A condensing boiler costs $1,900 to $7,000 for the unit alone, against $1,200 to $5,000 for a non-condensing unit, in HomeGuide's figures. Condensing units are the high-efficiency models; the DOE puts high-efficiency heating systems at 90% to 98.5% AFUE, against 56% to 70% for old, low-efficiency systems. HomeGuide adds $200 to $600 for the condensate drain a high-efficiency unit needs. Steam units cost more than hot water units: $1,800 to $6,000 for a steam boiler against $1,200 to $4,000 for hot water, unit only (HomeGuide).

Extra costs: removal, chimney liner, permits

• Old boiler removal: $200 to $500 (HomeGuide).
• Oil tank removal: $400 to $3,400 if you switch away from oil (HomeGuide).
• Chimney liner: $1,500 to $4,000 for a gas boiler venting through a masonry chimney (HomeGuide). See chimney repair.
• Permit: $50 to $250 (HomeGuide).
• Load calculation (Manual J): $200 to $500 (HomeGuide).
• Gas line work: $15 to $50 or more per foot for a new run (HomeGuide). See gas line repair.
• Zoning system: $1,700 to $4,500 (HomeGuide).

How long does a boiler last

A boiler lasts 10 to 20 years on average and up to 30 or more for some cast-iron boilers, according to HomeGuide, which advises replacing one once it is over 15 years old. HomeAdvisor says well-maintained boilers last about 15 years and cast-iron units may go beyond 20. If yours is younger and needs one part, compare the quote against boiler repair costs first.

Is there a tax credit for a new boiler in 2026

No federal tax credit applies to a boiler installed in 2026. The IRS says the 25C credit, which allowed up to $600 for a qualifying gas, propane or oil hot water boiler, is not allowed for property placed in service after December 31, 2025. Ask your gas utility about high-efficiency boiler rebates, and check your state energy office for DOE Home Energy Rebates, which cover electric heating and cooling upgrades in select states.

Boiler replacement near me: what to ask

• What size and how did you get it? Ask for a load calculation, not just a match to the old boiler.
• Condensing or not? Ask for the AFUE and what venting and drain changes it needs.
• What is included? Removal, permit, chimney liner, piping changes and the expansion tank.
• Warranty: HomeGuide says companies offer parts warranties of 5 to 10 years that usually exclude labor; get the terms in writing.
• License: the HVAC license table lists who licenses this work in six states. Ask for the number.

Considering a switch to forced air? Compare furnace replacement cost and heat pump installation cost. Boilers are one line in home repair costs. Calls go to an independent company that serves your area and takes this kind of job. How calls work.

When to replace a boiler instead of repairing it

ENERGY STAR says to consider replacing a boiler once it is more than 15 years old, or sooner if it needs frequent repairs and energy bills keep rising. It says an ENERGY STAR boiler is 5% more efficient than a new standard model. Lennox puts boiler life at 15 to 30 years and HomeAdvisor at 15 to 20. If yours is younger and has one problem, boiler repair lists part prices, and how long a furnace lasts compares lifespans across heating systems.