When to repair
The boiler holds pressure, it is under about 20 years old, and the fault is a pump, valve, ignitor or control — anything on the table above. Against a $4,290–$10,070 replacement, even a $1,100 pump is well inside the 50% line.
Cost guide · Updated July 2026
How much does boiler repair cost?
By the HVAC Service Call editorial team · Part bands single-sourced across our heating pages
Where two named sources disagree we print both rather than average them — the reasoning is in our methodology.
Most boiler repairs cost $150–$700, with the call-out charge at $75–$200 and usually credited if you approve the work. The two guides that publish a national average don't agree on it — HomeGuide says $300, Fixr says $450 — so we print both rather than a number neither of them stands behind.
THE COMMON FIX
An ignitor or thermocouple is $100–$400 — the routine seasonal call.
THE EXPENSIVE ONE
A circulator pump is $300–$1,100: heat, but nothing warm at the radiators.
THE ONE THAT ISN'T A REPAIR
A cracked section or cracked heat exchanger is a replacement decision.
01 · At a glance
The numbers, at a glance
Residential boiler repair costs $150–$700 for most jobs, and boiler repair costs cluster in the low hundreds because the parts that fail most often — ignitor, thermocouple, transformer, zone valve — are the inexpensive ones. The four-figure bills come from the circulator pump, the gas valve and the heat exchanger, and those are also the ones worth a second estimate.
$150–$700Typical repair
$300 / $450Two national averages
$75–$200Call-out charge
$200–$500Annual service
Steam, hot-water and combi boilers all price from the same table below — the fault decides the bill, not the badge. If you don't yet know which fault you have, the symptom-by-symptom version of this page is boiler repair, and the diagnostic walk-through is boiler troubleshooting.
02 · By part
Boiler repair cost by part
The part that failed sets the price more than the boiler's age, brand or fuel does. The bands below are installed prices — part plus labour — and each one is printed only where two named 2026 sources agree; where they printed different ends of a range, the third column says so instead of quietly splitting the difference.
| Part | Installed cost | Note |
|---|---|---|
| Ignitor | $100–$400 | Both sources agree |
| Thermocouple | $100–$400 | Gas and propane boilers only |
| Thermostat | $140–$350 | Simple swap, no boiler work |
| Transformer | $150–$500 | Both sources agree |
| Zone valve | $175–$500 | HomeGuide opens at $100 |
| Fan / draft blower | $200–$500 | Vented boilers only |
| Expansion tank | $200–$800 | Internal combi tank can force a replacement |
| Gas valve | $200–$1,100 | HomeGuide tops at $900; licensed work |
| Circulator pump | $300–$1,100 | Forbes tops at $1,900 |
| Heat exchanger / coil | $500–$1,000 | A cracked section is a replacement |
What we left off
Three rows sit in one source only — radiator valve, flue and water-pipe leak repair — so they are not printed here. A single-source number is a guess with a citation attached.
03 · Where the money goes
Anatomy of the bill
Three different numbers get called "the service fee", and knowing which one you were quoted is the difference between a $75 visit and a $300 one. Some contractors bill the first number as a boiler callout charge, others as a trip or diagnostic fee; it is the same line.
| In the bill | Amount | Source |
|---|---|---|
| Call-out charge (usually includes the first hour) | $75–$200 | HomeGuide; Fixr tops at $250 |
| Hourly labour after that | $75–$150/hr | Both sources |
| Flat repair fee, where charged instead of hourly | $150–$300 | Fixr |
| Emergency / out-of-hours hourly rate | $140–$210/hr | HomeGuide |
The call-out charge normally buys the trip plus the first hour of labour, which is why a fault diagnosed and fixed inside that hour can land at the bottom of the whole range. Parts are billed at contractor pricing rather than wholesale because they arrive with a warranty behind them. How the fee behaves across the trades is on HVAC service call cost.
04 · Servicing, not repairing
Boiler service cost — inspection, cleaning and the annual contract
Servicing and repairing are two different bills, and searchers ask for them in the same breath. A boiler service cost sits well under a repair: an inspection alone is $70 to $125, a clean is $150 to $350, and an annual contract that bundles both runs $200 to $500. The cost to service a boiler barely moves with the fault, because there isn't one yet — the price of a boiler service is set by fuel type and by how much cleaning the unit has been spared.
| Service | Cost |
|---|---|
| Inspection only (no parts) | $70–$125 |
| Annual service contract | $200–$500 |
| Gas or oil boiler cleaning | $150–$350 |
| System flush / descaling | $150–$600 |
A gas boiler service takes 30 to 60 minutes; an oil boiler takes one to three hours, because soot and the oil gun add real cleaning time. A new boiler wants its first service one to two years after installation, then yearly — and yearly is also what most manufacturers require to keep the parts warranty valid, which is the part of the deal that pays for itself. What a heating service actually includes is on our heating tune-up page, and the plan-versus-pay-as-you-go maths is on maintenance agreements.
Descaling is a third thing
A flush or descale is $150 to $600 and is neither a service nor a repair — it clears the limescale and sludge that make a boiler kettle. Hard-water homes need it most, and skipping it is what turns a cleaning bill into a heat-exchanger bill.
05 · Fuel changes the bill
Gas, propane, electric or oil — what does fuel change?
Fuel decides how many things can fail and how dirty they get. Both sources put the four fuels in the same order, and the spread from the least to the most expensive fuel is roughly $150 on a typical incident:
| Fuel | Typical repair | Why |
|---|---|---|
| Gas | $100–$400 | Nearly half of US homes heat with gas, so these are the repairs shops see most — valves, regulators, ignitors and gas lines. |
| Propane | $100–$400 | Mechanically close to gas at different pressures. A leak in the tank or line is the case that breaks the band. |
| Electric | $200–$500 | No combustion, no flue, no gas leak — but heating elements cost more than burner parts and fewer shops service them. |
| Oil | $200–$550 | The priciest to fix. The oil gun is a failure point gas systems don't have, and soot means more cleaning per visit. |
Boiler style matters separately from fuel: a combi handles heating and domestic hot water in one unit, so it has more that can fail than a heat-only boiler, and its expansion tank may be internal — a failed internal tank can force a whole-unit replacement where an external one is a $200–$800 part. Which type you have, and how to tell, is covered on the boiler guide.
One safety line applies to every gas and oil boiler regardless of price: work on the burner, the gas train or the flue belongs to a licensed technician, because the failure mode there is carbon monoxide rather than a cold house.
06 · What moves the number
What makes one boiler repair cost more than another?
Two identical boilers on the same street can produce bills a thousand dollars apart. Six things account for almost all of it, and the first accounts for most:
- Which part failed
- The dominant variable. An ignitor is $100–$400; a circulator pump is $300–$1,100. Same boiler, same technician, three times the bill.
- Where the boiler sits
- A basement unit with clearance on four sides is an hour. The same pump in a closet, reached over pipework, is three — and labour runs $75–$150 an hour.
- Age and parts availability
- Boilers outlive their parts catalogues. Past about 20 years a control or a matched valve can be discontinued, so the fix becomes an adaptation job.
- Fuel type
- Oil carries the oil gun and the soot; gas carries the valve, the flue and the carbon-monoxide checks. Electric has the fewest failure points and the dearest elements.
- Maintenance history
- A boiler serviced every year arrives at the fault clean. One that hasn't been touched in five years is a cleaning job plus a repair, billed as both.
- Warranty status
- Manufacturers commonly cover parts for 5–10 years on a registered unit. Labour and the call-out stay yours, which is why a covered part is still a paid visit.
Only two of the six are yours to move — when you call, and whether the boiler has a service record behind it. Both are the subject of the last section on this page.
07 · When repair stops paying ✓ ✕
Repair or replace?
Both of our sources use the same threshold: when the repair reaches 50% of a new boiler, replacing is the better spend. Boilers make that line generous, because they last longer than anything else in the mechanical room.
When to replace
The section or heat exchanger is cracked, the same fault keeps returning, or a major part fails on a boiler past 20 to 25 years where parts are getting scarce.
Repeat repairs on one boiler count together, not separately.
The tiebreaker
A cracked boiler section is a pressure-boundary failure, not a part swap — no contractor warranties a weld on one, and the section price approaches a new unit, which is why cracked boiler repair quotes usually come back as replacement quotes. Installed replacement runs $4,290–$10,070 per Carrier's 2026 guide with the average near $6,000; the detail is on boiler replacement, and the general framework on repair or replace.
08 · Paying less, honestly
How do you pay less for a boiler repair?
Not by buying a thinner repair. Five levers change the bill without changing the work:
- Get three estimates on anything over $1,000. Two shops in one market quote the same pump differently, and at four figures the spread is routinely wider than the call-out charge you'd pay to find out. Note which estimate is free: a replacement quote usually is, a repair diagnosis usually isn't, because someone has to open the boiler to give you a number.
- Ask whether the call-out charge credits toward the repair. Before the truck is dispatched, not after. Many shops credit it on a same-visit approval, some don't, and that one question is worth $75–$200.
- Book the work outside the heating season. Spring and summer are the quiet months for heating contractors, and an out-of-hours rate of $140–$210 an hour only exists because the call couldn't wait. A no-heat night in January can't wait; a weeping valve in June can.
- Keep the annual service record. It's what keeps the parts warranty alive, and a covered part is usually the largest line on the bill. It also catches the small faults while they're still small.
- Fix pressure and leak faults early. A slow leak topped up every few weeks is corroding the system and loading the expansion tank. The repair only gets more expensive while you're refilling it.
What none of this means is accepting a vaguer diagnosis. Ask for the number in writing before work starts and ask for it itemised — call-out, labour and part as separate lines. Comparing contractors properly is its own job, worked through on choosing an HVAC company; the DIY boundary, which on a pressurised gas appliance is a short one, is on DIY versus a pro.
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09 · Our numbers
Where our numbers come from
Every band on this page comes from published 2026 consumer pricing — HomeGuide's boiler service guide and Fixr's boiler repair guide — and a figure is printed only where both name a range for the same job. Where they differ, the table says which one sits higher rather than averaging them into a number neither published. Rows carried by one source only were left off entirely.
On the headline the two agree: $150 to $700 for a typical repair. On the national average they do not — HomeGuide reports $300 and Fixr $450 — and that gap is real information about how wide the middle of this market is, so both are on the page. Those bands live in one shared file every heating page on this site reads, and our city pages apply the Bureau of Economic Analysis regional price parity to the same file, so a metro page and this page cannot quote different prices for the same pump. Last reviewed July 2026.
What we do not do: we do not carry out the repair, we do not quote it, and we earn nothing from its size. Your call routes to a licensed local contractor, and the number you approve comes from the technician standing at the boiler.
10 · Questions
Common questions
How much is boiler service, and how often do you need it?
Budget $200 to $500 a year for a service contract, or $70 to $125 for an inspection alone and $150 to $350 for a cleaning. Once a year is the standard, with the first service due one to two years after installation. A gas boiler service takes 30 to 60 minutes; an oil boiler takes one to three hours because there is more to clean.
Is the call-out charge credited toward the repair?
Often, but confirm it before dispatch. The $75 to $200 charge typically covers the trip and the first hour of labour, and many shops fold it into the bill if you approve the repair on the same visit. Others treat it as a separate diagnostic fee whatever you decide. The full fee mechanics are on our service-call cost page.
Why is boiler repair expensive for what looks like a small part?
The part is one line. You are also paying the call-out charge, labour at $75 to $150 an hour, a warranty-backed part at contractor pricing rather than wholesale, and tax. Boiler work also carries pressurised water, and on gas or oil units combustion, so the licensing behind the visit costs more than a general handyman call.
Is it worth repairing an old boiler?
More often than with a furnace, because boilers are long-lived — commonly 15 to 35 years, though Fixr puts the typical figure nearer 15 to 20. The rule both our sources use is the 50% rule: if the repair reaches half the price of a new boiler, replacement is the better spend. Under that, and with the system holding pressure, repair usually wins.
Can a cracked boiler section be repaired?
Rarely, and not as a lasting fix. A cracked cast-iron section on a sectional boiler, or a cracked heat exchanger on a modern unit, is a pressure-boundary failure — welding it is not a repair a contractor will warranty. Replacement of the section costs close to a new boiler, which is why the quote you get back is usually a replacement quote.
Does a home warranty cover boiler repair?
Sometimes, subject to a per-visit fee, coverage caps and a maintenance requirement. Homeowners insurance generally does not — it covers sudden damage from a covered peril, not wear-and-tear breakdown. Manufacturer warranties commonly cover parts for 5 to 10 years on a registered unit and exclude labour. Read which of the three you actually hold before you count on it.
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