Replacing your boiler: What you need to know

Discover how much it can cost to replace your boiler and how long installation will take.


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Replacing your boiler is likely to cost hundreds of pounds and the most complicated installations can take a couple of days, but the benefits of a new boiler go beyond the relief from having reliable hot water again.

Figures from Ofgem suggest you could cut your energy bills by over £200 a year by upgrading to a more energy-efficient boiler. What’s more, the installation of a new boiler can have a positive impact on your house price when the time comes to sell.

The guide below aims to give an estimation of how much you can expect to pay to replace your boiler.

How much does a new boiler cost?

The price of a new boiler varies tremendously depending on the model you opt for. If you’re going for a budget boiler, you can still expect to fork out £600-£850. An average mid-range model could set you back between £850 and £1,100, while you may pay up to £2,000 for a premium boiler.

With some installations, you may have to pay for the cost of your heating system to be flushed. However, many providers will include this free of charge.

On top of these costs, you’ll have to pay for the installation. The cost of this will depend on the complexity of the job.

The most basic installations – such as replacing an old heat-only boiler with a new one in the same location – may cost between £1,600 and £1,800.

When you’re changing boiler types or moving your boiler to a different location, the price tends to shift upwards. The process for replacing combi boilers is particularly arduous, so you can expect installation costs to rise if you’re working with these.

System boilers – the high-performing boilers often fitted in large houses with multiple bathrooms – are twinned with unvented hot water tanks. This makes the installation process a lot more complicated and you may be quoted installation prices up to £4,000 as a result.

How long does it take to replace a boiler?

Once again, this depends on the complexity of the job.

Our example of a basic task – replacing an old heat-only boiler with a new one in the same location – can often be completed in one day. If you’re moving your new heat-only boiler to a new location, this could stretch the labour into a second day.

The complications involved with system boilers mean that the installation process could take between two and three days to complete.

Alternatives to boiler replacement

You could save a lot of money on your energy bills by replacing boilers with the following features:

  • A continuous pilot light (the flame you see burning through the small window)
  • No thermostat or inflexible heating controls
  • It’s based on the floor instead of the wall

These are all signs that your boiler is older and far less energy-efficient than the newer models. Your boiler will have an energy-efficient rating, which you can check for yourself. Boilers with a G rating should be replaced as soon as you can afford it.

Of course, it’s not always possible to fund these expensive one-off purchases immediately, even if they’ll save you money in the long run.

Here are some potentially more affordable ideas for you to reduce your energy bills:

  • Switching to a cheaper energy provider
  • Loft or wall insulation
  • Draught-proofing
  • Window insulation
  • Smart thermostats

Annual boiler servicing can help keep your boiler in a condition where it’s working at its best and doesn’t need to be replaced. You’ll need to arrange for your boiler to be serviced annually in order to keep your boiler’s warranty valid.

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