Boiler Bundles

Gas Boilers

Buying and installing a new gas boiler will probably be one of the largest investments that you'll make for your home.

Therefore, it's vital that you make a wise choice on the best new boiler for your particular needs and (of course) at the best possible price.

However, with a huge selection of manufacturers such as Baxi, Ideal Boilers, Worcester, Glow-Worm and Vaillant and types of gas boiler available it's no surprise that it can be a daunting prospect.

This is why we've put together a useful guide to the types of gas boilers available and some of the best brands in the market. Not only this, but you'll also find free information on how to save money on your central heating bills as well as a range of quick guides to help make the decision-making process easy.

You'll be pleased to know that as one of the UK's most trusted suppliers of gas boilers we only stock brands and products that are reliable, represent exceptional value for money and are highly rated by gas heating installers.

Worcester Bosch Group Boilers
Vaillant Combi Boilers
Ideal Combi Boilers
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Help and Advice

What are the different types of gas boiler?

Generally, in the UK there are three types of gas boiler. These are 'Combination boilers' (More commonly known as Combi boilers) 'System boilers' and 'Conventional boilers'.

Combi Boilers

Combination gas boilers are now the most popular boilers in the UK. They deliver high efficiency water heating and central heating in one combined small unit. They work by heating water directly from the mains. This means that as soon as you turn on a tap you get almost instant hot water. As the Combi boiler is an all-in-one unit there is no need for a hot water cylinder or a cold-water tank in the loft.

One of the biggest benefits of a Combi boiler is that they are extremely cost effective and efficient as water is heated on demand instead of being heated then stored. What's more, mains pressure hot water also means power showers without needing separate pumps.

Often, combi boilers are used in smaller properties due to their small footprint. Because there is no cold-water storage tank then it also means that a typical installation is often cheaper. Your local installer will be able to advise you on the right gas combi boiler for your home.

Compact sizes make combi boilers perfect for smaller properties Ideal where there is little or no loft space No need for a hot water cylinder allows increased living space No cold-water storage tank frees up a loft for conversion No risk of loft pipework freezing Less pipework in the home makes installation typically cheaper.

System Boilers

System boilers are generally considered easier to install due to the fact that the heating and hot water system workings are all installed into the actual boiler. With System boilers, you also don't need to have a tank in the loft which means that they can be a good choice if loft space is limited.

System boilers are generally specified for larger homes with more than one bathroom. This is because a system boiler delivers a constant supply of hot water to multiple hot taps at once.

Regular Boilers

Regular boilers are often known under a few different names such as 'heat only', 'conventional' and 'traditional' boilers.

They are usually used in homes that already have a traditional hot water system and a separate cylinder for the hot water. Unlike the Combi and System gas boilers the Regular gas boilers require a cold-water tank in the roof space. This is to provide water for the hot water cylinder. They also require a tank to keep the level of water in the central heating system at a constant level.

Sometimes, Regular gas boilers can be a good option if your property has old radiators that will not handle the high-water pressure from Combi and System boilers.

Boiler efficiency

You may be surprised to learn that your gas boiler may be responsible for approximately 60% of the CO2 emissions from your home. So, if you want to reduce your energy costs and carbon footprint (and let's face it, it's a no brainer) then your choice of gas boiler is a very important decision indeed!

The good news is that most modern boilers perform similarly when it comes to their efficiency. If you are one of the households that have an old-fashioned condensing boiler (pre-2005) then changing it for a new Combi or System boiler will deliver significant savings.

Choosing the right size boiler

Selecting the right size boiler is a priority when choosing a new one. Your local, trusted installer will be able to help you with this choice.

Alternatively, check out our boiler builder here. It provides a fast and easy way to help you spec your ideal boiler.

There are two things to consider when looking for the correct boiler size.

  • The hot water and heating performance of the boiler.
  • The physical size of the boiler.


The choice of boiler performance will be determined by the number of people in your household, and how many bathrooms you have.

The physical size of your boiler will simply determine where you can locate it and if there is enough room.

We always recommend getting a survey from your trusted heating installer.

Which boiler should I buy?

The most important aspects of buying a new gas boiler are its reliability, efficiency and (of course) value for money.

Our range of gas boilers will give you the choice and reliability you'll need. We stock a huge range of boilers from manufacturers such as as Baxi, Ideal Boilers, Worcester, Glow-Worm and Vaillant all at great prices and all delivering exceptional performance and dependability. Keeping you warm throughout the winter and always delivering hot water when you need it.

We suggest speaking to your local, qualified heating engineer for advice.

Boiler installation

Boiler installations should only be carried out by a qualified heating engineer. These can be found the Gas Safe Register.

We always recommend getting at least three quotes for any installation work and make sure the quotes include all items such as the boiler cost and the labour to install it.

Finally, clearly tell your installer what you want from your system. Let them know if you are planning to extend or refurbish your house create a room in your loft space as this may influence the location and size of the system.