What is a condensing boiler? If you purchased a boiler after 2005, chances are that it is a condensing boiler, a high-efficiency boiler. Rather than being a ‘type’ of boiler - such as combi boiler, system boiler or conventional boiler - the term ‘condensing’ refers to the way it functions. There are three main types of the gas boiler - Combination (or combi), System and Regular. If you are unsure about the type of boiler you currently have, these two simple questions will help 1. Do you have a hot water cylinder? (this is usually in a cupboard or airing cupboard) No - You have a Combi Boiler Yes - You have a Regular or System Boiler 2. On the Boiler, Is there a Pressure Gauge? No - You have a Regular Boiler Yes - You have a System Boiler Boilers can be confusing, especially when you are looking for a new boiler. When you know a little about the boiler types - discovering the right replacement gas boiler for your home can be easy. COMBI BOILER A Combination boiler is a simple unit that delivers both hot water and heating, which makes them great for small to medium-sized homes. Combi boilers heat water directly from the mains, whenever you turn on your hot tap. If you are buying a new combi boiler, you don't need a hot water storage cylinder or a cold water storage tank in the loft, so they save space too. SYSTEM BOILER Unlike gas combi boilers, a system boiler needs a cylinder for storing hot water, but they don't take up space in your loft. With a system boiler, some of the main heating and hot water system components such as the pump are built into the boiler itself, so it's quick and easy to install. A System boiler is ideal for homes with two or more bathrooms as it can allow you to have multiple showers running at the same time. A CONVENTIONAL BOILER OR REGULAR BOILER A Conventional boiler also called regular, open vent or traditional boilers, need both a hot water cylinder and a tank in the loft to store cold water. This type of boiler is perfect for homes where a lot of hot water is used at the same time and are particularly well suited to low water pressure areas and installing into systems which have lots of old radiators.
Difference between Vented and Unvented Boiler Cylinder