Cold Water Storage Tanks or cisterns are normally situated in the roof or loft space and supply the hot water cylinder and all the cold taps in the house - but not drinking water taps in the kitchen. Older properties may still have a galvanized steel tank, however these may leak so it may be wise to consider installing a new cold water storage tank. A 50 gallon (227 litre) tank is probably the most popular tank and it is small enough to fit through the loft hatch. Byelaw 30 Kits keep the water clean and is a requirement of all water suppliers.The Byelaw 30 kit includes a close-fitting lid that excludes light and insects and is fitted with a screened breather and a sleeved inlet for the vent pipe. You will also require a overflow-pipe assembly with a insulating jacket. BHL supply a wide range of cold water storage tanks from leading brands including Titan and Polytank.