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Luke warm response


Your recent item on geothermal heating (NCE 15/29 December) set me thinking. If the facts I have gleaned from elsewhere are correct, temperature within the earth's crust increases with depth at a rate of 2°C-3°C every 10m although there are areas where the increase is greater.

Drilling down 30m would therefore only be likely to produce heat at a degree or so over the ground surface temperature. Even taking the latter as the 15° world average the resulting hot water would scarcely be warm enough for a bath!

An article in NCE setting out the opportunities for geothermal heating in the UK - giving the appropriate figures and perhaps, maps - would be very welcome.

Robert Holland (F), dduuttcchh44@hotmail. com

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