Boiler installation, Boilers

Combi Boiler Installation: Installing A Combination Boiler

A combi boiler is designed to contain all its parts in one neat, compact unit which is far more energy efficient and takes a lot less time to heat up than older boilers with a hot storage water tank. When you are having your new combi boiler installed all that needs fitting is this single unit – this shouldn’t take a professional engineer more than a couple of hours to install.

So installing a combi boiler should also be a pretty cheap job, right? Well, that’s not strictly always the case. For one thing, every model is designed differently, and the costs of installing your combi boiler will depend on a number of practical factors such as size, whether or not radiators need replacing and the length of flue required to vent waste gases. You might also need to remove old water tanks in the attic and airing cupboard too, so all in all, it could take a couple of days to install your new combi boiler.

To help you on your way, we have provided this quick guide which explains just how much each aspect of installing a combi boiler might set you back.

How much does a combi boiler cost?

First of all, you will need to decide where you are going to purchase your new unit; each outlet will charge varying prices depending on the size and make of combi boiler you choose:


From high-street retailers such as Tap Store or Primrose Bathrooms to local plumbers in your area, or even online companies such as the OneStopBoilerShop, there are several retail outlets for you to choose from when purchasing a new combi boiler. Costs will generally be cheaper online, especially if you shop around (often as little as £200 – £300 for the really simple models!), but going to local shops or traders will enable you to negotiate a better deal in person, one that often includes installation and a warranty and/or guarantee in the asking price.



Costs of installing a new combi boiler will vary between different energy companies, but generally n-power and British Gas are considered the more expensive options (around £1,000 – £1,500). Combi boiler installation costs from smaller companies such as E-on UK or EDF Energy come in at around £600 – £800.


Again, prices will vary depending on the brand and quality of model you choose. Combi boilers from manufacturers such as Glow-Worm or Worcester Bosch usually cost between £750 and £1,300 including installation; while lesser quality models such as Baxi or Corgi generally charge closer to the £500 – £800 mark.

Alternatively, you can figure out the costs of a new combi boiler based on the amount of work that needs to be completed. Here are some examples that range from some of the cheapest to most expensive cost scenarios:

  • Installing a combi boiler in a prepared area: £600 – £800
  • Installing a combi boiler in a new area that may need re-sizing: £650 – £900
  • Installing a combi boiler and new radiators (including installing relevant pipework): £900 – £1,500
  • Removal of old heating system (including old water tanks and copper piping) and comprehensive replacement of all materials and fittings: £1,500 – £2,500

As you can see, the price of installing a combi boiler will vary from household to household; the most important thing is to save and budget before making your purchase – so you are absolutely certain you can afford the model you need. Additionally, you should never just buy the first thing that comes up; shop around and compare quotes to get the best deal you can, and that way the cost of your combi boiler installation will be kept as low as possible.

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