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In today's cast, I complete our introduction to heating systems with a look at central heating.  Common to all central heating systems are three main components: 1. The fuel 2. The engine or heater 3. The distribution system - pipes, ducts and outlets There are two main mediums for transfering heat. Air is common with gas-fired heaters and large ducts but is not as effective as water based systems. Air ducts can lose up to 1 degree per m of duct.  Heating that is not true central heating includes inslab or undertile electric element heating, heat transfer and ventilation system.