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The Natural Philosopher[_2_] The Natural Philosopher[_2_] is offline
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Default OT air sourced heating. was ground source heating

wrote:
On 2 Feb,
The Natural Philosopher wrote:

You don't have to find geologically active bits dennis.

Go down any coal mine - below a mile its about 30C plus

There are (were before MT closed them down) hot mines and cold mines, wet
mines and dry mines gassy mines and safe mines. It all depends on the
geological conditions.

No they were not cold mines. They were coal mines.


All mines get hot as you go deeper.