Abstract: A thermal store system for a water heating system comprising a primary thermal store containing a primary volume of water adapted to be heated by a primary heating means, said primary thermal store being in thermal communication with a central heating supply flow and a central heating return flow, a secondary water heat exchanger in thermal communication with the primary volume of water, the secondary water heat exchanger having a water feed flow and a water outlet flow for supplying hot water, at least one of said central heating return flow and/or said water feed flow being in thermal communication with at least one further thermal store, upstream of said primary thermal store, said at least one further thermal store containing a medium adapted to be heated by at least one supplementary heating means.

Abstract: A heating system comprising at least one temperature sensing device in the form of a wireless transponder. Preferably the temperature sensing device comprises an RFID transponder which may take the form of a substantially planar patch. Preferably said at least one temperature sensing device is arranged for communication with at least one communications relay node via a wireless link. In use, the or each temperature sensing device may send to the or each relay node information indicating the temperature measured by the sensor and, preferably, an identifier that uniquely identifies the respective temperature sensor.