The water that is supplied to your home will begin its journey at the main stop-tap to the home. Croydon Plumbers will fit, service and repair all central heating systems. This can be located at any one of the locations below:1). Under the Kitchen sink.2). In a Kitchen Cupboard.3). Bathroom.4). WC or Cloakroom.5). Garage or Utility Room.6). Cellar or under the stairs.Once it passes through the stop tap it goes up to and fills a small tank called a feed and expansion tank through a ball valve arrangement, located in the loft. Here is the reason why it was given the name gravity fed system. Gravity:The water is now directed downwards under the force of gravity so it builds up speed to feed your boiler and its radiators. The gravity fed system makes it possible for you to go out of the house, yet still keep the heating running. But with added bonus of isolating the cold water supply if you are away for a long while.Recognition:In the loft find the feed and expansion tank. A Croydon Plumber is trained to identify and work on all types of water heating systems. This tank is so called as it takes expanded hot water from the system, making sure that the so that the system does not become over pressurised. It is small, having the dimensions: 500x300x300mm. Look inside this tank and you cannot fail to notice it contains dirty and dank water, which has arrived from your heating system. This is normal as the corrosive affects cause the dirt.Note: You must remember that to operate correctly if all, the cylinder that stores the water for your system must be higher than the whole system to make sure the radiators etc. are fed.