In message . com,
Jonathan writes

Thanks for this. As a riparian owner, you are actually allowed to
abstract 20 cubic metres of water a day without a licence. Our river
is pretty clear and I would want some sort of filter to keep my
irrigation pipes clean.

Hmm... now would that be enough to run a heat pump? Also does riparian
ownership allow you to put the same 20 cubic metres back?

75% of mine is treated sewage so nicely above ground water
temperatu-)

regards
--
Tim Lamb