How much does a boiler repair typically cost (UK prices)?

When your boiler breaks down, especially during the colder months, getting it fixed quickly becomes your number one priority. However, understanding what it might cost beforehand can help you budget – and avoid unwelcome surprises. Boiler repair prices in the UK vary depending on the fault, your location and whether you need an emergency callout.

Before going over specific repairs, let’s look at how heating engineers typically charge for their services. Most reputable engineers charge an hourly rate ranging from £80 to £120 per hour during standard working hours, although there’s usually a minimum charge of one hour, even for quick fixes. For specialist work, such as commercial gas engineering or oil boiler repairs, you can probably expect rates around £100 to £150 per hour.

Most engineers charge in 15-minute increments after the first hour. Reputable companies provide transparent pricing before beginning work. Be wary of anyone who cannot give you at least a rough estimate after diagnosing the problem.

For emergency or out-of-hours callouts, prices typically start at £180 for the initial hour, and this can potentially double on weekends or during bank holidays. Unless the situation is truly urgent, you might be best off waiting until normal working hours.

Of course, if you can smell gas, you need to call the National Gas Emergency Service on 0800 111 999. They will shut off the supply and make it safe, but if there’s any damage that needs repairing, that’s where the gas engineer can take over, and they will charge as normal.

Common minor repairs (£100–300)

Several frequent boiler issues fall into the lower price bracket. A faulty thermostat typically costs between £100 and £250 to replace, including parts and labour. The wide range reflects differences between basic thermostats and modern smart controls.

Replacing a broken pressure gauge or pressure relief valve usually costs £100 to £200. These are relatively quick jobs, often completed within an hour, though the cost of parts can vary between boiler models. Bleeding radiators and repressurising the system might cost £80 to £120 if done professionally, though many homeowners can handle this sort of thing themselves.

Frozen condensate pipes, which are common during cold snaps, can often be fixed for around £80 to £100, as thawing and insulating the pipe is pretty straightforward for a professional. However, sometimes the pipe needs rerouting or it’ll just freeze again next time it drops below zero. That’s a different job, and could cost £200 to £300. You might get away with adding insulation, however. Your engineer will be able to advise you.

Moderate repairs (£300–600)

Moving into the middle price range, replacing a faulty pump typically costs £300 to £450. The pump is vital for circulating hot water through your heating system, so it must be done if it has broken. This job doesn’t actually take all that long, but parts can be expensive. A broken fan similarly falls into this bracket, with replacement costs averaging £350 to £500. The fan takes harmful gases away from your boiler, so it’s an essential safety component that cannot be ignored.

The printed circuit board (PCB) is your boiler’s brain, and when it blows, it’s one of the costlier repairs at £400 to £600. The diverter valve switches your boiler between heating and hot water, so if it gets stuck, you could have one or the other, but not both. This typically costs £350 to £500 to replace. It might require draining part of the system, which adds to the labour time.

Major repairs (£600–1,500)

Replacement of the heat exchanger is one of the most expensive single component repairs, coming in at around £600 to £1,200. This is an expensive component but it also takes quite a long time to replace, so it’s a double whammy.

If multiple components need replacement simultaneously, costs mount quickly. For example, if both the pump and PCB need replacing, you’re looking at £700 to £1,000. At this point, especially with older boilers, you might find it’s cheaper in the long run to get a new, efficient boiler (see below).

Finally, the gas valve replacement, costing £400 to £750, is another pretty expensive repair. As with all the estimates above, the costs vary between manufacturers, and the nature of your specific repair.

When replacement becomes necessary

Sometimes, repair simply isn’t cost-effective. If your boiler is over 12 years old and needs a major repair costing more than £600, replacement often makes financial sense, as this probably won’t be the last component to go over the next few years. Modern boilers are a lot more efficient than older ones, and can save £300 or more on gas bills every year. Take a look at when your warranty runs out, because that might be a key factor in your decision.

Warning signs that replacement might be necessary include frequent breakdowns, difficulty in finding replacement parts, visible corrosion or leaks, and strange smells or noises coming from your boiler. An honest, reputable boiler engineer will be able to advise you, but there comes a point when the safety of you, your family and your home become more important than the cost.

New boiler installation costs

Boiler replacement costs vary significantly based on the type of boiler and the complexity of the job. A straightforward combi boiler swap (where the new boiler goes in the same place as the old one) typically costs £1,800 to £2,500, and that includes the boiler, installation and disposal of the old one.

System boiler replacements cost slightly more at £2,000 to £3,000, whilst converting from a conventional system to a combi boiler can reach £3,000 to £4,000 due to additional pipework and the removal of tanks from your loft.

If you’re getting a completely new type of boiler or a major system upgrade, a bill of £4,000 to £6,000 would not be extraordinary, but since every property and system is different, it’s impossible to even give a ballpark estimate without visiting the property.

Annual servicing prolongs your boiler’s life

Regular servicing, typically costing £90 to £150 annually, is excellent value for money, all things considered. Services include safety checks, cleaning key components and catching small issues before they become big, expensive repairs. Many manufacturers insist on annual servicing to keep the warranty alive, so your services will pay for themselves if something goes wrong after five years and it’s the manufacturer’s fault.

Money-saving tips

There are boiler cover plans available if you prefer predictable monthly costs over unexpected repair bills. Basic plans start around £10 monthly, though comprehensive coverage including annual servicing and all repairs might cost £25 to £40 monthly. Remember that some repairs might be covered under warranty. Check your boiler’s documentation before paying for repairs – you might have to pay nothing.

Always obtain multiple quotes for major repairs, as prices can vary significantly between companies. Whoever you choose, prioritise Gas Safe registration and good reviews over cheap prices – poor workmanship is dangerous.