Stored System:The stored system is the lower pressure of the two systems that are commonly employed throughout the domestic plumbing systems.The system makes use of the cold water mains supply to a property to fill up a big water storage tank that is fitted in the loft space. Feltham Plumbers know all systems. The water that is supplied to the taps is from the storage tank, which means that if you turn off the mains cold water it does not instantly stop water flow from the taps. Should the tank be really large, then, it can take around a half hour 20-30 to empty and for the taps to stop running. In an emergency situation it can be a very long 30 minutes, so if your property uses stored water you need to know where the valves are that will turn this water off at once. Mains Supplied System:This is a high pressure system, as all cold water is fed directly from the main domestic supply, this means that by turning off the main cold water stop tap will stop the cold water taps running. The water is used in a unique way that controls the hot water with its pressure, pushing hot water out from the taps. The result is that turning off this mains will stop the hot water also. You could have a cylinder where the hot water is stored but with no cold water pressure to push hot water through, it wont reach the taps and will sit in the hot water cylinder. A Feltham Plumber knows about this system. Lots of properties use a mixture of both stored (above) and mains fed water. Cold water main feeds the kitchen and then from storage tanks to the bathroom, whilst all the hot water will be from a stored supply. “