There are so many different types of domestic heating systems. The phrase wet central heating sounds pretty obvious but in fact it describes how the system works. Hot water circulates through a system of pipes that connecto to the radiator that are installed in each room and the water fed to them via pipework. In a new property when the heating is installed at time of building, these pipes are discretely hidden behind the panelling or wall. Old houses, where heating is added later, the pipwork has to be surface mounted, sometimes covered by conduit. However the radiators are mounted, they are serviced by a boiler or sometimes a heat exchanger which heats the water which is fed via the pipes. Radiators do not just radiate heat they delivery most heat through convection which is air warmed by the radiator that naturally rises and cool air falls relative to it. This results in warmed air curculating and the space in the room is thus wared. Most often the pipework will be connected to a hot water cylindder also known as the tank, which stores the heated hot water for bathing and washing.