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Ground-source heat pumps, the subject of this week's renewables feature, are experiencing a surge in interest for heating, and sometimes for cooling too, due to the spread of the 10 per cent renewables quotas being adopted by local authorities. Long established on the continent and in the US, they rely on the temperature stability of the ground or groundwater.

Go to ajplus. co. uk for more detailed information on this rapidly evolving topic, the third in our renewables technology series. Upcoming topics include solar thermal, photovoltaics, small-scale wind, and labyrinths.

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