The Different Boiler Types Explained

It can be hard to know whether to choose a combi, conventional, or system boiler. That’s why our boiler experts have put together a handy guide to help.  

Combi boiler

Combi boilers are usually the most cost-effective option, making them a popular choice for family homes. They’re ideal if you don’t have much storage space available and you want a boiler that’s quick to install. They’re also a good choice if you want to have one system to manage both your central heating and hot water. 

If you own a larger property with several bathrooms or need a hot water supply to multiple outlets at once, a combi boiler may not be the right choice. We may also advise against a combi boiler if the pipe entering your property is less than 22m in diameter, or you’re particularly concerned about good flow rate. 

Conventional boiler

Conventional boilers tend to be found in older properties. They supply hot water directly to radiators and to a separate water cylinder. They are ideal if you require hot water for multiple outlets at once or have a large property with several bathrooms. They’re also perfect for power showers! 

To install a conventional boiler, you’ll need to have enough space for a separate cold water tank (this would go in the loft) and a hot water cylinder. One possible downside of conventional boilers is that once the hot water runs out, you’ll have to wait for more to heat up. Some people find this inconvenient.

If you’re looking for a boiler that’s quick to install, or it’s essential that you have good water pressure at all times, a conventional boiler may not be the right choice for you.

System boiler

A system boiler will supply heat straight to your central heating system and to a hot water cylinder. However, unlike conventional boilers, system boilers don’t require a cold water tank. If a lack of loft space is putting you off choosing a conventional boiler, this could be the alternative!

System boilers are also quicker to install than conventional boilers, and they're great if your property has a high demand for hot water or you need to have good water pressure at all times.

If you'd raher not have to wait for your water to reheat, or you simply don’t have the space for a hot water cylinder, you may want to consider a combi boiler instead. Combi boilers are also more cost-effective than system boilers, and better suited to smaller homes with only one bathroom.  

If you’re unsure about which type of boiler to choose, our boiler experts are here to help. We supply a range of boilers from the UK’s leading manufacturers, including Worcester Bosch, Vaillant, Glow-worm and Viessmann. For more information, please get in touch with us on 01202 081141