COMBINATION BOILER WATER SYSTEM Your home has A combination boiler for hot water on demand usually located in the kitchen NO storage tanks NO shower pump How does it work 1 Cold water delivered at mains pressure min 1 0 bar to boiler cold supply 2 Water is heated as it travels through the combination boiler providing hot water on demand 3 The pressure is dictated by the incoming mains and the flow of water is determined by the power of the selected boiler Fig 5 MAINS HIGH PRESSURE WATER SYSTEM Your home has An unvented cylinder with an expansion vessel usually located in a garage or service cupboard NO cold water tank in the loft NO shower pump How does it work 1 Cold water delivered at mains pressure min 1 5 bar 20 l min 2 Water passes to a cylinder where it is heated by a boiler circuit flow 3 An expansion vessel replaces the storage tank in loft to deal with expansion 4 The water pressure is determined by mains pressure Fig 4 BOOSTED GRAVITY FED WATER SYSTEM Your home has A cold water storage tank in the loft A hot water cylinder usually in an airing cupboard An additional booster pump How does it work 1 Cold water is fed to a storage tank in the loft 2 Water passes to a cylinder where it is heated by a boiler circuit flow 3 The pressure of water is determined by a separately installed pump 1 3 bar dynamic Fig 3 Fig 3 Fig 5 Fig 4 grohe co uk

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