A heat pump system 200 comprises a heat pump 210, a heating unit 220 and a domestic hot water unit 230 connected to the heat pump via respective pipes 202, 203. The heat pump may be an air source heat pump, a ground source heat pump, or a mixed air/ground source heat pump (dual source heat pump). The system may comprise a connection pipe 204 connecting it to a utility network 240, where the utility network is a network water supply comprising a potable water network and a sewerage network. The connection to the utility network may be a direct connection via the connection pipe or an indirect connection via a heat exchanger. The sewerage network may comprise heat recovery. The heat pump system may be operable in at least one of an air only mode, ground only mode, and mixed air/ground mode. The modes may be selected at the heat pump directly or via a user control interface 290 and may include a heat collector mode. The system may comprise a data collection means which collects a heat pump system operation data and/or a dwelling data and transmits it to a data storage location.
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