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A Complete Guide to Combi Boilers

So you’re looking for a new boiler. What is the most important factor in your decision? Price? Efficiency? Brand reliability? It’s more than likely a combination of all three and, if your old boiler has thrown in the towel without warning, you’ve got the added time pressure of needing an urgent installation.

Don’t worry, we’re not trying to make you feel worse; we’re here to help you make the right choice for your home.

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If it’s time to replace your current boiler, use our free service to get quotes now.


Why Choose a Combi Boiler?

When it comes to replacing an old, inefficient or broken boiler, Combi boilers are the most popular choice amongst homeowners for several reasons.

  • Unlike System or traditional boilers, they are a single combined unit. To be more specific, they don’t require a separate water tank or hot water cylinder and can usually fit snugly into a kitchen cupboard. This saves a huge amount of space in your home.
  • Because they’re an all-in-one unit, they’re relatively easy to install as there’s no need for extra bits and pieces. Easy installation means a quicker installation which equals a cheaper installation. Great news all round!
  • They produce hot water on demand so there’s no need to use extra energy keeping a storage cylinder hot. And there’s no waiting around for the tank to refill after the water is gone.
  • A Combi boiler takes its water supply directly from the mains unlike traditional systems which rely on gravity from a tank in the loft; this should mean you get a much stronger flow of hot water.

Making the Right Choice for Your Home

Before you settle on a Combi…

As wonderful an invention as they are, Combi boilers aren’t the right fit for every home. You may want to consider a System or Regular boiler if:

  • Your home is particularly large and / or has several bathrooms / showers / sinks. A Combi boiler takes its water from the mains and if it needs to supply several outlets at once it will have to split the flow making it weaker.
  • The mains pressure is weak. The pressure of the water is dictated by the flow from the mains.

Still set on a Combi boiler? Get free quotes for a Combi boiler from reputable installers near you.

Which Brands are the Best?

There is a huge selection of Combi boilers on the market with many manufacturers offering multiple ranges. In terms of overall reliability and performance, these brands come out on top year after year:

Brand Most Popular Model Available Outputs (kW) Standard Warranty
Worcester Bosch Greenstar i 25 / 30 5 years
Vaillant ecoTEC Plus 25 / 32 / 35 / 38 2 years (7 years when installed by Vaillant accredited installer)
Ideal Logic+ 24 / 30 / 35 7 years
Baxi EcoBlue 24 / 28 5 years

All of these boilers are described as being able to fit in a standard kitchen cupboard and are A rated for efficiency. They’re widely recommended by our network of 5000 installers up and down the UK and dominate the top spots in numerous consumer review polls. As you might expect, they are not the cheapest boilers on the market but when it comes to quality, you get what you pay for.

There’s a variety of brands manufacturing several combi boiler models, use our guide to find out which Combi boiler is the best.

Get FREE Combi Boiler Quotes

If it’s time to replace your current boiler, use our free service to get quotes now.


Which Size do You Need?

It’s really important that you get the right size or output of boiler for your home. If the boiler is too small it will not be able to meet your hot water demand, and if it’s too big you will end up wasting energy and spending more money on bills.

In addition to your hot water requirements, the boiler also needs to be able to keep up with the strength of the mains pressure as it flows through the boiler. A professional will be able to measure this and advise you as to the best size. Get free quotes today from up to 3 qualified installers by completing one of our simple online forms. To give you a headstart, this is the general guideline set out by industry professionals:

  • Small house (1-2 bedroom) or flat, up to 10 radiators, 1 bathroom = 24 – 27kW
  • Medium house (3-4 bedroom), up to 15 radiators, 1-2 bathrooms = 28 – 34kW
  • Large house (4 or more bedrooms), up to 20 radiators, 2 or more bathrooms = 35 – 42kW

Combi Boiler Costs

When budgeting for your new Combi boiler you can expect to pay anywhere between £400 – £2000 for the boiler itself – and that’s quite a price range! You should be able to find a good quality boiler for around £800 – £1500, but then you will need to pay extra for the installation.

The cost of installation will vary from supplier to supplier and will be impacted by any extra work that needs to be carried out. The cheapest installation is a straightforward like for like boiler replacement, but if you are looking to change the position of your boiler, upgrade pipes or replace radiators the cost will increase.

The best way to make sure you’re getting the best possible price for the installation is to compare multiple quotes from different suppliers.

We can provide you with up to 3 quotes from registered and reputable installers. All you need to do is complete our short enquiry form – it only takes a minute – and we will be in touch in a matter of hours to confirm your details and get you your quotes. You can then compare their advice, service quality and price to make sure you’re getting the right Combi boiler for your home.

Get FREE Combi Boiler Quotes

If it’s time to replace your current boiler, use our free service to get quotes now.


Need a new boiler?

Get FREE no-obligation quotes now!

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