Boiler projects vary widely because the heat source, distribution system, venting, fuel type and existing piping all matter. Older homes can require more labor than a simple equipment swap suggests.
Boiler repair cost
Common service can begin in the low hundreds, while circulator pumps, controls, gas valves and major heat-exchanger or combustion repairs can move into four figures.
Boiler replacement cost
A broad planning range is roughly $5,000 to $12,000 for many residential replacements. Complex venting, indirect water heating, zoning changes, pumps and piping can push the project above that range.
Why boiler quotes vary
Boilers are part of a hydronic system, so the contractor may need to address pumps, expansion tank, air elimination, controls, venting, chimney condition, water quality or zone valves in addition to the boiler itself.
Age and efficiency
Many boilers last longer than forced-air equipment. Age alone does not require replacement, but frequent failures, unsafe combustion, leaking heat exchangers or a very inefficient system can justify comparing new equipment.
Estimate your cost
Use the calculator below for a state-adjusted planning range. Your contractor still needs to diagnose, size or inspect the actual system before giving a firm quote.
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