Basic water central heating - radiator pipework - Diydata Water Central Heating - the pipework . single pipe - feed and return - micro bore. A water central heating system consists of basically the boiler, the radiators and the interconnecting piping. The boiler heats the water and (normally) a pump circulates the water through the pipework and radiators and back to [PDF] UNDERSTANDING CENTRAL HEATING SYSTEMS Dec13 • Combination boiler - This boiler provides central heating and instant hot water. Other components of the central heating system 1. Heating emitters - radiators The radiator is the most common way of heating your home. There are many types of radiator, many are made from copper or aluminium but most are made from steel.