In message , Robin
writes
On 04/04/2021 20:40, Tim Lamb wrote:
In message , Theo snip
Water source is best, if you have a lake or river available.
I have a river:-)
*I suspect the EA may object to me extracting heat from it. Actually
warmer than spring fed due to upstream sewage treatment.



I don't see why in principle given it's being done up and down the
country by various councils.

I have not really explored this. We own both banks of a non navigable
stream for about 200m and a single bank for about 1000m.
The rules kindly allow me to extract up to 20cu.m/day. I think someone
once worked out the extractable energy which at Winter temperatures was
quite low.
Inserting heat exchangers into the stream bed has not been tested but
their first quibble will be anti-freeze chemicals (salt?).

The other issue is having a heat requirement close to the bank which I
don't currently have.

--
Tim Lamb