Combination boilers, commonly referred to as ‘combi’ boilers are a convenient way of supplying both hot water and heating in a compact package without requirement for water storage. They prove extremely popular, as they are usually more economical to install than traditional or unvented systems (Mega Flow) and take much less space. They also operate on mains pressure (No need for cold water storage anymore freeing space in your loft, cupboard) on in general should provide much better showering experience. Combi boilers provide hot water ‘on demand’ heated while it passes boilers heat exchanger therefore limiting waste of energy on storing hot water. Boiler Installers London