There are a couple of different water storage systems that can be fitted in the home. These are almost always situated in the loft space. Should you be sure of what type you have, then, below is a brief guide to help you decide. A Croydon Plumber knows different cylinders.Cylinders:A). The first thing to know is that the cylinders that store the water are or should at least be constructed from copper, with a foam or fiberglass insulating cover. B). The top of the storage cylinder has a piece of pipework coming out and moving horizontally to the cylinder. This pipe rises gently and then splits into a T shape with one piece going up and the other piece down. If you follow the up pipe, you arrive at another cold-water storage tank, over which this vent pipe terminates. This is made so any water in this pipe it will run into the cold-water storage tank. C). This pipe indicates that you are fitted with a vented hot water cylinder. No pipe indicate that you have an unvented cylinder, and is described below:1). The outside wall of this cylinder is constructed from steel and there is no insulation visible, with a series of valves connected to it, or maybe to an expansion tank.2). A Tundish is close to the cylinder. This is a gap in the pipework which allows you to see the water flow. If there is water present, this indicates there is a issue with the boiler, so if you do see water in the pipe, it is more than likely down to a device failure so you should contact a professional with the relevant G3 qualifications to check the cylinder. Like Croydon Plumbers are trained on all types of cylinders and can service this them.