Combi boilers are one of the most popular heating solutions in the UK as they provide heating and hot water from one unit. They are directly connected to the mains cold water supply – essentially, combi boilers provide hot water on demand, rather than having to wait around for the water to heat up. Better yet, this way you only ever pay for the amount of hot water that you use, so they’re much more efficient when it comes to energy usage and finances.
The downside? Combi boilers aren’t for everyone. They’re a great choice for smaller homes and buildings that require less heating and hot water. Thanks to their streamlined design, they don’t take up much space as they don’t have to be supported by a storage tank. But this does mean that you’ll struggle to get steady hot water from two outlets at the same time – so we wouldn’t recommend trying to take a shower while someone’s washing up! Some of the other pros and cons of combi boilers are:
Advantages |
Disadvantages |
No need for loft space |
Not ideal for larger spaces |
Water provided straight from the mains |
May not be compatible with your existing setup |
Instant hot water |
Limited by mains water pressure |
Easier to maintain and service, due to less piping & engineer expertise |
Require a good level of pressure |
Less pipework also means a lower risk of freezing |
Leaks can lead to a loss of pressure |
These are your ‘regular’ boilers – the most traditional form of heating in the UK. They are designed to provide heating and hot water using a cold-water tank and a hot-water cylinder. Cold water travels from the first tank into the storage cylinder where it is heated and fed into the home, resulting in warm radiators and hot showers. These types of boiler can provide hot water to multiple outlets at one time, which makes them ideal for busy buildings and homes. However, because hot water is stored in a cylinder, this means it can’t be supplied on demand.
These types of boiler are typically more complicated and take up more room – because of the two tanks – so they’re best suited to larger buildings. They’re often suited to older buildings too, or at least those with older plumbing and radiators, as conventional boilers provide lower water pressures than combi or system boilers. But one of the key selling points for regular boilers is that they’re well-suited to solar energy systems, resulting in an overall reduction of carbon emissions and energy bills.
A conventional boiler may also be the best choice for your property if your current setup contains a boiler and hot water cylinder, but not a tank in the loft. This makes installation much easier with a like-for-like swap. Some of the other benefits and disadvantages of conventional boilers include:
Advantages |
Disadvantages |
Hot water can be supplied to multiple sources at one time |
Hot water isn’t available on demand |
Ideal for low water pressure areas |
Takes up more space |
Compatible with solar energy systems |
Installation can be difficult and costly if the necessary infrastructure isn’t already in place |