Is it worth repairing a boiler or should I replace it?

Use the 50% rule: if the repair cost exceeds 50% of a new boiler's price, replace it. Also consider age — if your boiler is over 15 years old, replacement is usually more cost-effective. New boilers cost $3,500–$8,000 installed.

How much does emergency boiler repair cost?

Emergency boiler repair adds a $75–$150 after-hours surcharge on top of the standard repair cost. Expect to pay $300–$1,000 total for most emergency call-outs. Getting quotes from multiple contractors can reduce costs significantly.

How long does boiler repair take?

Most boiler repairs take 1–3 hours. Simple fixes like thermostat replacement or pilot light repair take under an hour. Complex repairs like heat exchanger replacement can take 4–8 hours or require parts to be ordered, extending to 1–2 days.

Boiler Repair Cost Guide

Q: How much does boiler repair cost?

Boiler repair costs range from $150 to $2,500 depending on the repair type. Common repairs: ignition fault ($150–$400), circulating pump ($400–$900), heat exchanger ($800–$2,500), expansion tank ($200–$500), thermostat ($150–$350), zone valve ($200–$600), gas valve ($300–$800).

How much does boiler repair cost? Our data-driven guide covers average costs by repair type, city, and helps you decide between repair and replacement.

Average Repair Costs by Type

Repair Type	Low End	High End
Ignition Fault / Pilot Light	$150	$400
Circulating Pump Replacement	$400	$900
Heat Exchanger Repair	$800	$2,500
Expansion Tank Replacement	$200	$500
Thermostat / Aquastat Repair	$150	$350
Zone Valve Replacement	$200	$600
Gas Valve Replacement	$300	$800
Annual Maintenance / Tune-Up	$100	$250
Full Boiler Replacement	$3,500	$12,000

Average Cost by City

Denver$420avg repair Chicago$480avg repair Philadelphia$450avg repair Boston$520avg repair Minneapolis$400avg repair

Repair vs. Replace

Consider Repairing

Boiler is less than 15 years old
Repair cost is under 50% of replacement
Only one major component needs work
System is still efficient (AFUE > 80%)

Consider Replacing

Boiler is over 20 years old
Frequent breakdowns (3+ per year)
Energy bills have increased significantly
Parts are discontinued or hard to find