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There are four images. (a) shows a drawing of a cutaway section of a house with a garden to the left. Inside the house is a brown box labelled ‘heat pump’. Two blue pipes are shown extending to the left from the heat pump out into the garden. Three alternative heat sources are shown at the left. At the top is a labelled ‘air source fan coil’. Below this is a horizontal loop of pipe labelled ‘OR shallow ground source coil’ and below this is a loop of pipe descending into the ground labelled ‘OR pipe loop in deep borehole’. Inside the house, to the right of the heat pump an orange loop of pipe is shown ascending upwards and to the right into a labelled ‘Hot water storage tank’. There is another label ‘Domestic hot water’ above this cylindrical tank. The tank is coloured blue at the bottom and orange at the top. A blue arrow labelled ‘cold water’ points from right to left into the bottom of the tank. An orange arrow labelled ‘Hot water to taps’ points from left to right away from the top of this tank. Lower down in the diagram a loop of pipe coloured orange runs from the right hand side of the heat pump connecting it with an image of a radiator and labelled ‘radiators’. Beneath this is a label ‘Space heating’. Below this is another loop of pipe which runs from the right hand side of the heat pump and is labelled ‘underfloor heating’. To the left of the heat pump a large yellow-orange arrow labelled ‘Low temperature heat’ runs towards it from left to right from the outside of the house. A blue arrow, labelled ‘electricity’ ascends towards the bottom of the heat pump. Another orange arrow runs from the right of the heat pump towards the right into the house. Photograph (b) shows a free-standing fan coil unit, which acts as the evaporator for an air-source heat pump system. It takes the form of a white metal box approximately 1 metre high, 0.3 metres thick and 1.5 metres long with a fan approximately 0.7 metres in diameter behind a metal grille. It is shown outdoors in front of a brick wall outside a house. The fan coil draws heat from its location in the external environment, which is then used to heat the inside of the house. Photograph (c) shows evaporator pipes laid in a trench for a ground-source heat pump. These are coils of plastic piping lying in the bottom of an outdoor trench approximately 0.8 metres wide and 0.5 metres deep. The trench is about 1 metre from the outside wall of a building and runs parallel to it. Photo (d) shows two men positioning a drilling rig in a garden. The drill takes the form of a metal tube about 4 metres high and half a metre in diameter.

 3.3.1 Heat pumps