The smarter way to replace your boiler

  • Get FREE Quotes today
  • Compare quotes & save money
  • Over 5,000 engineers across the UK
Tell us about your job
Get Free Quotes

Combi Boilers Prices

Combi boilers prices vary from £500 to £2800 dependent on make and model

Combi boilers prices vary hugely in price – normally from £500 to £2800 depending on brand, insurance/warranty, installation and, of course, the size/power. Combi’s are the most popular type of boiler used in the UK, mainly because they’re compact units that don’t require a cold-water tank or hot water storage cylinder to provide heating and hot water for homes.

Modern combi boilers also tend to be the most energy efficient as they deliver a fast supply of instant hot water whenever a tap is turned on. As combi boilers have the ability to provide on-demand heating and hot water without needing any additional components, they are particularly ideal for flats and houses where space is restricted.

When it comes to choosing a combi boiler for your home, we always recommend you compare models and costs from some of the top rated and most reliable brands. Prices differ according to the manufacturer and the overall boiler quality, but there are plenty of combi boilers available to suit all budgets.

Get Combi Boiler Quotes

Get Free Quotes Today

Combi Boiler Sizes and Prices

Dependent on the size of your house, combi boilers prices will differ. Selecting the right size (kW output) combi boiler for your home is extremely important. If you choose a boiler that’s too small for your property, it won’t be able to produce the right amount of heating and hot water to meet your needs. However, this does not necessarily mean that you should purchase a big boiler. When you install a combi boiler that is too big for your home, you’ll waste energy and spend more money on your fuel bills.

We have put together a guide that shows you some of the most suitable combi boiler options for the size of your home to make it easy for you to compare models, warranties and costs. Our guide is designed to give you a rough idea of the appropriate boiler output, so you’ll still need to ask a qualified heating engineer to help you work out the correct size combi boiler for you and your property.

Options for Small 1-2 Bedroom Homes (Combi Boiler 24 kw to 27 kw Output)

BRAND & MODELSIZE / OUTPUTRATINGWARRANTYPRICE
Biasi Inovia Combi25kWA5 years£610
Ferroli Modena HE Combi27kWA5 years£612
Baxi 200 Combi24kWA3 years£630
Vokera Vision Combi25kWA5 years£643
Potterton Promax Combi24kWA2 years£772
Glow-worm Energy Combi25kWA7 years£790
Viessmann Vitodens 100-W Combi26kWA5 years£844
Worcester Bosch Greenstar Si Combi25kWA5 years£852
Vaillant ecoTEC Pro Combi24kWA2 years£884
Ideal Vogue Max Combi26kWA10 years£1,109
Get Small Sized Combi Boiler Quotes

Get Quotes Now

Options for Medium 3-4 Bedroom Homes (28 kw to 33 kw)

BRAND & MODELSIZE / OUTPUTRATINGWARRANTYPRICE
Biasi Riva Plus Combi28kWA2 years£514
Vokera Compact A Combi29kWA5 years£539
Ferroli Modena HE Combi32kWA5 years£635
Baxi 400 Combi28kWA5 years£690
Potterton Gold Combi33kWA2 years£820
Glow-worm Energy Combi30kWA7 years£850
Viessmann Vitodens 050-W Combi29kWA3 years£858
Ideal Logic Max Combi30kWA10 years£965
Worcester Bosch Greenstar CDi Compact32kWA5 years£1,086
Vaillant ecoTEC Plus Combi32kWA5 years£1,250
Get Medium Sized Combi Boiler Quotes

Get Free Quotes Today

Options for Large 4+ Bedroom Homes 35Kw to 42Kw

BRAND & MODELSIZE / OUTPUTRATINGWARRANTYPRICE
Biasi Inovia Combi35kWA5 years£658
Glow-worm Ultimate3 Combi35kWA5 years£770
Ferroli Modena HE Combi38kWA5 years£791
Potterton Titanium Combi40kWA7 years£996
Ideal Logic+ Combi35kWA7 years£1,011
Vokera Linea One Combi38kWA5 years£1,156
Baxi EcoBlue Advance Combi40kWA10 years£1,250
Viessmann Vitodens 200-W Combi35kWA3 years£1,295
Worcester Bosch Greenstar CDi Classic42kWA5 years£1,435
Vaillant ecoTEC Plus Combi38kWA5 years£1,500
Get Large Sized Combi Boiler Quotes

Get Free Quotes Today

Top-Rated Combi Boilers by Brand   

When you start shopping around for a new combi boiler, you’ll soon discover that there is a huge variety of brands and models on the market today. As a new boiler is a costly investment, it makes sense to consider combi boiler options from well-known manufacturers with an excellent reputation for producing quality boilers that are built to last.

Below, you can find a table that includes just some of the best combi boilers on offer from the UK’s most popular brands.

BOILER BRANDSERIESOUTPUT OPTIONSPRICEOVERALL WHICH? SCORE
Worcester BoschGreenstar Highflow CDi Combi29kW or 30kW£2,053 – £2,44886%
ViessmannVitodens 200-W Combi26kW, 30kW or 35kW£1,150 – £1,29583%
VaillantecoTEC Pro Combi24kW, 28kW or 30kW£900 – £1,80080%
IdealLogic+ Combi24kW, 30kW or 35kW£879 – £1,01169%

*Prices and Which? scores correct at time of writing in December 2018

Which? Best Buy Combi Boilers

Reputable consumer magazine, Which? conducts tests and surveys to help members of the public pick the best appliances (including boilers) for their homes. The magazine gives each boiler brand an overall score based on a combination of things, such as build quality, owner satisfaction, product reliability and heating engineer recommendation. Which? is also known for awarding ‘Best Buy’ status to boilers and other products that are not just great but the best your money can buy.

If you want to find out which gas and oil combi boilers have won the Best Buy accolade from Which?, simply refer to the table below.

BOILER BRANDWHICH? BEST BUY COMBI BOILER NAMEPRICE
Worcester BoschGreenstar i Combi£767 – £855
Worcester BoschGreenstar Si Compact Combi£852 – £953
Worcester BoschGreenstar CDi Classic Combi£1,019 – £1,435
Worcester BoschGreenstar CDi Compact Combi£973 – £1,204
Worcester BoschGreenstar CDi Highflow Combi£1,710 – £2,400
Worcester BoschGreenstar Heatslave II (oil)£2,200 – £2,500
Worcester BoschGreenstar Heatslave II External (oil)£2,400 – £2,750
ViessmannVitodens 222-F Combi£2,474 – £2,606
ViessmannVitodens 200-W Combi£1,150 – £1,295
ViessmannVitodens 111-W Storage Combi£1,518 – £1,632
ViessmannVitodens 100-W Combi£844 – £1,104
ViessmannVitodens 050-W Combi£858 – £861
VaillantecoTEC Plus Combi£1,100 – £1,500
VaillantecoFIT Pure Combi£850 – £1,100
VaillantecoTEC Exclusive Green iQ Combi£1,400 – £1,920

*Best Buys sourced from the Which? website in December 2018

Why You Should Consider A Combi Boiler for Your Home

Combi boilers have numerous advantages over system and heat only boilers, but a modern condensing combination boiler won’t be the best choice for every home. Two of the most common combi boiler problems are that most struggle to provide heating and hot water simultaneously or can’t deal with two showers or baths running together at the same time. Because of this, combi boilers aren’t usually recommended for rather large homes or properties with several bathrooms. But like we just said, they do have some major plus points.

Let’s take a look at why so many people across the UK have opted for an energy efficient combi for their homes.

Energy efficiency

One of the main benefits of combi boilers is that they work hard to ensure minimal energy wastage and a smaller carbon footprint. They take water directly from the mains and only heat water that you need to use each time you turn on a tap, rather than store the water in a tank or cylinder.

Instant hot water

All combi boilers are designed to provide instant hot water, so you’ll never have to wait around to enjoy a warm bath or shower. The hot water is supplied on demand, so there’s less risk of running out.

Neat and compact

Most condensing combi boilers are designed to look neat and modern to ensure they don’t look out of place in the home. They’re also quite small, and the majority of models have compact dimensions to appeal to flats and houses where space is tight.

No tanks or cylinders

Heat only boilers need a tank in the loft and a cylinder in the airing cupboard, and system boilers need just a hot water cylinder. This is where combi boilers have the edge because they don’t need any separate components at all.

Easy to install

Combi boilers are easy to install and can save you money on fitting costs because they don’t need to be installed with a separate cold water tank or hot water storage cylinder. As this also means that your engineer can spend less time installing your boiler, the work can be completed in a much quicker timeframe.

Before you start to shop around for a combi boiler, it’s best to arrange for a reputable heating engineer to survey your home and assess your requirements so that they help you select the correct boiler output (size) for your property. Now is also a good time to tell you that all gas combi boilers must be installed by Gas Safe registered engineers and oil-fired combi boilers should be fitted by OFTEC registered technicians.

Combi Boiler Installation Costs

In addition to paying for a new combi boiler, you’ll need to spend some money on the installation. The fitting cost will depend on the type of boiler you want to replace and the amount of work involved. As combi boilers don’t need to be installed with loft tanks or a hot water storage cylinder, the installation is generally quicker and cheaper.

If you already have a combi boiler and want to upgrade to a newer combi model and have it installed in the exact same spot within your home, the installation cost will be less than if you are looking to swap a system or conventional boiler for a combi. Installation takes longer when switching from a system or conventional boiler to a combi because the pipes need to be re-plumbed and the cylinder and/or cold water tank has to be removed, making the fitting cost more expensive.

Our table includes guide prices for different types of combi installations to give you a rough idea of how much it will cost you to install a new combi boiler.

THE TYPE OF COMBI BOILER INSTALL YOU REQUIREINSTALLATION COST
You want to replace a combi boiler with a new combi boiler and have it installed in the same place as your existing unit£550 – £670
You want to replace a combi boiler with a new combi boiler and have it installed in a different location£1,400 – £1,700
You want to replace a system boiler and hot water storage cylinder with a new combi boiler£2,000 – £2,700
You want to replace a conventional boiler, cold water tank and hot water storage cylinder with a new combi boiler
Get Free Boiler Quotes

Get Free Quotes Today