A storage heater charges up overnight and releases heat during the day. Thermal heating bricks in the storage heater body warm up between midnight and 8am when electricity is available at cheaper rates. The air circulating through your home throughout the day passes through your storage heaters and is heated up by the bricks. A free electric storage heater could be yours.
A major asset of storage heaters is their ability to charge up overnight. This makes it possible to take advantage of cheaper night-time tariffs such as Economy 7