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 can 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.
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 & MODEL | SIZE / OUTPUT | RATING | WARRANTY | PRICE |
|---|---|---|---|---|
| Biasi Inovia Combi | 25kW | A | 5 years | £610 |
| Ferroli Modena HE Combi | 27kW | A | 5 years | £612 |
| Baxi 200 Combi | 24kW | A | 3 years | £630 |
| Vokera Vision Combi | 25kW | A | 5 years | £643 |
| Potterton Promax Combi | 24kW | A | 2 years | £772 |
| Glow-worm Energy Combi | 25kW | A | 7 years | £790 |
| Viessmann Vitodens 100-W Combi | 26kW | A | 5 years | £844 |
| Worcester Bosch Greenstar Si Combi | 25kW | A | 5 years | £852 |
| Vaillant ecoTEC Pro Combi | 24kW | A | 2 years | £884 |
| Ideal Vogue Max Combi | 26kW | A | 10 years | £1,109 |
Options for Medium 3-4 Bedroom Homes (28 kw to 33 kw)
| BRAND & MODEL | SIZE / OUTPUT | RATING | WARRANTY | PRICE |
|---|---|---|---|---|
| Biasi Riva Plus Combi | 28kW | A | 2 years | £514 |
| Vokera Compact A Combi | 29kW | A | 5 years | £539 |
| Ferroli Modena HE Combi | 32kW | A | 5 years | £635 |
| Baxi 400 Combi | 28kW | A | 5 years | £690 |
| Potterton Gold Combi | 33kW | A | 2 years | £820 |
| Glow-worm Energy Combi | 30kW | A | 7 years | £850 |
| Viessmann Vitodens 050-W Combi | 29kW | A | 3 years | £858 |
| Ideal Logic Max Combi | 30kW | A | 10 years | £965 |
| Worcester Bosch Greenstar CDi Compact | 32kW | A | 5 years | £1,086 |
| Vaillant ecoTEC Plus Combi | 32kW | A | 5 years | £1,250 |
Options for Large 4+ Bedroom Homes 35Kw to 42Kw
| BRAND & MODEL | SIZE / OUTPUT | RATING | WARRANTY | PRICE |
|---|---|---|---|---|
| Biasi Inovia Combi | 35kW | A | 5 years | £658 |
| Glow-worm Ultimate3 Combi | 35kW | A | 5 years | £770 |
| Ferroli Modena HE Combi | 38kW | A | 5 years | £791 |
| Potterton Titanium Combi | 40kW | A | 7 years | £996 |
| Ideal Logic+ Combi | 35kW | A | 7 years | £1,011 |
| Vokera Linea One Combi | 38kW | A | 5 years | £1,156 |
| Baxi EcoBlue Advance Combi | 40kW | A | 10 years | £1,250 |
| Viessmann Vitodens 200-W Combi | 35kW | A | 3 years | £1,295 |
| Worcester Bosch Greenstar CDi Classic | 42kW | A | 5 years | £1,435 |
| Vaillant ecoTEC Plus Combi | 38kW | A | 5 years | £1,500 |
| Ariston Alteas ONE Net Combi | 35kW | A | 12 years | £1,100 |
| Ariston Genus ONE Net Combi | 35kW | A | 12 years | £1,050 |
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 BRAND | SERIES | OUTPUT OPTIONS | PRICE | OVERALL WHICH? SCORE |
|---|---|---|---|---|
| Worcester Bosch | Greenstar Highflow CDi Combi | 29kW or 30kW | £2,053 – £2,448 | 86% |
| Viessmann | Vitodens 200-W Combi | 26kW, 30kW or 35kW | £1,150 – £1,295 | 83% |
| Vaillant | ecoTEC Pro Combi | 24kW, 28kW or 30kW | £900 – £1,800 | 80% |
| Ideal | Logic+ Combi | 24kW, 30kW or 35kW | £879 – £1,011 | 69% |
*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 BRAND | WHICH? BEST BUY COMBI BOILER NAME | PRICE |
|---|---|---|
| Worcester Bosch | Greenstar i Combi | £767 – £855 |
| Worcester Bosch | Greenstar Si Compact Combi | £852 – £953 |
| Worcester Bosch | Greenstar CDi Classic Combi | £1,019 – £1,435 |
| Worcester Bosch | Greenstar CDi Compact Combi | £973 – £1,204 |
| Worcester Bosch | Greenstar CDi Highflow Combi | £1,710 – £2,400 |
| Worcester Bosch | Greenstar Heatslave II (oil) | £2,200 – £2,500 |
| Worcester Bosch | Greenstar Heatslave II External (oil) | £2,400 – £2,750 |
| Viessmann | Vitodens 222-F Combi | £2,474 – £2,606 |
| Viessmann | Vitodens 200-W Combi | £1,150 – £1,295 |
| Viessmann | Vitodens 111-W Storage Combi | £1,518 – £1,632 |
| Viessmann | Vitodens 100-W Combi | £844 – £1,104 |
| Viessmann | Vitodens 050-W Combi | £858 – £861 |
| Vaillant | ecoTEC Plus Combi | £1,100 – £1,500 |
| Vaillant | ecoFIT Pure Combi | £850 – £1,100 |
| Vaillant | ecoTEC 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 REQUIRE | INSTALLATION 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 |