Setting the right budget

How much should you expect to pay?

We know it's difficult to estimate how much a project will cost, that's why we've surveyed our tradesmen to give you an idea of how much you should expect to pay for specific jobs. Tradesmen all across the country have contributed to the cost guides, so the costs you see are an approximate national average.

Combi boiler

Cost estimates for a new boiler (dependent on your current boiler system)

If you currently have no boiler installed:

New Boiler Low High
Combi £1,500 £2,500

If you currently have a combination boiler installed:

New Boiler Low High
Combi £1,300 £2,300

If you currently have a regular or conventional boiler installed:

New Boiler Low High
Combi £2,000 £2,000

If you currently have a system boiler installed:

New Boiler Low High
Combi £2,000 £3,000

The combi or combination boiler is the most popular kind of boiler that plumbers and heating engineers install in homes nowadays. They are energy efficient, provide hot water on demand and will last you a long time if they are cared for properly. You should always use a Gas Safe-registered heating engineer or plumber to install your new boiler. This means that the installation will be safe but it also ensures that you will engage a professional who knows what will be best for your home.

Your heating engineer will usually visit your home first to look at your current set up, measure up and give you a detailed quote. At this stage they may also give you price options for different boilers and talk about boilers and brands that they recommend. Professionals usually have a vast experience of working with boilers and can tell you which provide the best value, which are most energy efficient and which are the most reliable. It is usually best to go with big name brands, as this means that more engineers will be available should you have any problems in the future. It also means that parts are more readily available.

The installation of your combination boiler

Once you are happy with the quote your heating professional will fix a date to come over to install the boiler. They will usually supply the boiler themselves and be transparent about the cost of the item. If you have any doubts then you can always check online. The main cost you are paying for the job is for the boiler, as well as the labour and expertise of your engineer. You can expect the installation to take the best part of a day overall.

The engineer will first remove your current boiler and any pipe work that needs to be disposed of. They will then make all the adjustments needed to fit and mount the new boiler. If you are having your boiler moved then they will also need to drill out holes for ducting from the boiler and make good at the site of the previous boiler.

Once the new boiler is installed, with gas and water connections made, your heating professional will test the boiler to make sure that it heats water efficiently and that it works with any central heating that you have installed. They will usually show you some basic settings on the boiler, such as the thermostat and how to increase or decrease the pressure in the boiler as needed. The engineer should also show you how to ignite the pilot light.

A combination boiler provides heat and hot water directly from the boiler, so no separate hot water cylinder or tank in the loft is needed. Hot water is delivered from the boiler when you need it. Combination boilers can be more efficient in this respect. It can be cheaper to install than regular or system boilers because there is no need for a separate hot water cylinder or water tanks in the loft.

Pros and cons of a combi boiler

  • Unlimited heat and hot water when you need it
  • No need for a tank in your loft and doesn’t take up much space
  • Water pressure might be reduced if you need hot water from more than one tap at a time.
  • Not suitable for large households.
  • The hot water can run out and you’ll have to wait for it to reheat.
  • You need to find room for the cylinder and possibly the water tank.
Rated People surveyed 65 of our registered plumbers and heating engineers across the country to give you an idea of the approximate cost of installing a new boiler, materials included.

Please note these prices are average and are offered as guidance only, to help you budget when posting a job on Rated People. For a free quote tailored to your specific requirements, please contact our local heating engineers.


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