The 3-Minute Guide To Boiler Repair Costs

Welcome to our 5-minute guide to boiler repair costs.

Alongside a table with boiler part replacement costs, we’ve covered when you should replace your boiler, rather than repair it.

And, we’ve also included a small section on how to protect your boiler at the end of the article.

Boiler Repair Cost Guide

Below we’ve created a table that highlights the average replacement cost of boiler parts. These prices are all estimates.

Depending on the model, brand and type of boiler, the replacement parts will vary in price. And, heating engineers in various parts of the country will charge different prices.

The repair costs below include both parts and labour.

Think the more cost effective solution is a replacement boiler? You can get a price on-screen in less than 90 seconds from BOXT. They’re part owned by Bosch, so supply Worcester boilers, well, cheap!

Here’s an example of a quote we just got online:

Boiler Part To Be Replaced

Replacement Cost

Heat Exchanger£475
Expansion Vessel£300
Diverter Valve£350
Overheat Thermostat£180
Ignition Leads£200
Gas Valve£300
Air Pressure Switch£200
Automatic Air Vent£170

Gas Safe Engineer’s Hourly Rate

The above prices are estimates for fixed price repairs. 

If you don’t know the problem with your boiler, it’s likely you’ll need a Gas Safe engineer to come and diagnose the problem before fitting replacement parts.

But first, check out boiler fault finding guide. Still stuck? You can book in a experienced engineer here.

The hourly rate for a Gas Safe engineer will depend on a few things.

The first, is the time of the day.

For example, is your call outside of normal working hours and considered an emergency? This is going to increase the hourly rate considerably.

The second, is the part of the UK you’re based in.

Hourly rates for Gas Safe engineers in London can be almost double that of other parts of the UK.

Finally, the size of the company you choose to use.

Large national firms can charge 30-50% more than a local engineer.

All said, expect to pay £50-60 per hour for a diagnostic. And then, expect to pay for the fixed price repair on top of this.

Replacement Parts, Or Reconditioned?

Some boiler parts can be reconditioned, cleaned or fixed; they don’t always have to be replaced.

A typical example might be a boiler pump that is leaking. In many cases, simply swapping the seals will fix the leak.

However, it’s worth consulting your heating engineer.

If one component in a boiler part has failed, it’s likely others will follow.

And, the time for labour is usually better spent replacing the entire part, in this case, the pump.

When To Consider A New Boiler

There’s a few things to consider before repairing a boiler, and one is whether a replacement boiler is going to be more cost effective in the long run.

Deciding whether to replace rather than repair a boiler will be determined by:

  • Age of the boiler and outstanding warranty
  • The condition of expensive boiler parts
  • Cost to repair your boiler
  • Replacement cost for a new boiler
  • Boiler protection devices that are currently fitted

Want to get a fixed price on screen (no personal details needed…takes 90 seconds) before you continue reading? Jump over to this clickable form.

#1 – Age Of The Boiler

If your boiler is 5+ years old and out of warranty, it’s worth considering a replacement rather than a repair.

Boiler manufacturers place certain levels of warranty on their products for a reason; beyond the warranty they start to fail and become expensive to run.

Investing in boiler repairs for a unit that is on its way out is rarely worth the money.

#2 – The Condition Of Expensive Boiler Parts

The next thing to consider is the condition of other expensive boiler parts. If they look like they are in good condition, repairing the faulty part is worthwhile.

However, if an engineer feels some or all of these parts are on their way out, a replacement should be considered.

The most expensive and important parts to consider checking for wear and damage include:

  • Pump
  • Fan
  • Heat Exchanger
  • PCB
  • Burner
  • Diverter Valve

#3 – The Cost To Repair Your Boiler

Next, you’ll want to consider the cost of the actual repair.

Small repairs in the £100-200 range are worth the investment.

But spending £300-500 on an old boiler, with no warranty and the chance of other components failing; it’s time to consider a replacement.

A typical example of a part that sway many to replace their boiler rather than repair it, is a faulty or broken PCB.

A replacement PCB could cost £350-500 to install, depending on the type of boiler you have.

That’s a lot of money to be investing in an old boiler that is already proving that it’s on its last legs, and we’d be jumping straight over to here and getting a fixed price on screen.

#4 – The Cost To Replace Your Boiler

If we take a 2-3-bedroom property, looking for a reasonably sized combi boiler, you could expect to pay £1800-£2,500, depending on size. You can use this online boiler quote calculator to determine the exact price.

In this case, something like the Worcester 30i with a 7-year warranty would be perfect.

Consider also, newer boilers are around 90% efficient; old boilers are not.

So, newer units can offer savings of around £200 per year.

Over the course of the next 7-years, you’d actually save the majority of your investment on utility bills alone, and be covered by warranty over that period.

#5 – Boiler Protection

This is something a lot of people don’t consider.

There are a few ways to protect your boiler:

  • Adding central heating inhibitor to break up rust and dirt in the pipes
  • Fitting a boiler filter to catch this dirt and rust
  • Installing a scale reducer to catch limescale

If none of the above are currently fitted, your boiler has been exposed.

Most manufacturer’s warranties will be void if central heating inhibitor isn’t added – that’s how important it is.

And, limescale can find its way to the heat exchanger, create hotspots, and cause it to crack.

Finally, rust and dirt (known as central heating sludge) can block not just radiators, but also parts in the boiler like the heat exchanger and pump.

Essentially, if none of the above boiler protection precautions are in place, even without a visual inspection, there’s a good chance your boiler is better off being replaced.

Once it has been replaced, fit the above devices to help protect your new boiler.

What’s Next?

Thanks for reading our 5-minute guide to boiler repair costs. Need quotes for repairs? Book in quotes here.

Fed up of your broken boiler and want it replaced? We’d recommend BOXT here.

Are you looking for a boiler repair but the part you need replaced hasn’t been listed?

Need advice on whether the repair quote for your boiler is a rip off?

Leave a comment below. We’re happy to help by answering any questions.

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