Selecting a new boiler can be a big decision! There are lots of options available, and sometimes this can be overwhelming. Don’t worry though, we’ve outlined the advantages and disadvantages of Combi and System boilers for you, so you can make an informed decision.
System boilers are fitted to sealed heating systems, but unlike combis they work on the principle of storing hot water in a cylinder, so they can feed several outlets at once at mains pressure. There’s no need for a cistern in the loft and the expansion vessel is built in.
Advantages: They are ideal for larger homes with higher demands and are ideal for households where multiple outlets are used at once. Flow rates are usually high as water is delivered at mains pressure, and hot water is instantaneous.
Disadvantages: They are likely to run out of hot water if they are overused. They have been considered to be more complex and more prone to problems like pressure loss.
Combi boilers (short for combination) are Britain’s best-selling type of boiler. They work as sealed systems, providing hot water for both the taps and central heating system, heating the water directly from the mains as and when it is needed. This means there is no need for a hot water storage cylinder, so they take up less space, making them ideal for smaller properties.
Advantages: They are compact and quick to install. Water is delivered at mains pressure, so you can enjoy a more powerful shower.
Disadvantages: It’s a priority system, so it only satisfactorily deals with one heating need at a time. Larger households may experience poor flow rates when multiple outlets are used at once. Performance is also dependent on the diameter of the pipe entering the property. If it’s less than 22mm, then a combi is not an ideal choice.
If you have any questions, or would like to learn more, please don’t hesitate to contact us!