Brian Gaff wrote

Yes which is why I mentioned it, unless they have a secret volcano in
Croydon nobody is aware of?

Don’t need a volcano, just ground that conducts
heat adequately and a big enough area of collector.

"Andrew" wrote in message
...
On 18/10/2019 13:47, RJH wrote:
I see Croydon is fitting ground source heat pumps to heat a 44 unit high
rise. Amongst other things, they say it'll cut the costs of maintaining
the current storage heaters.

I thought storage heaters were pretty much maintenance free. And GSHPs
required annual monitoring of their relatively complex electronics and
piping to make sure they continue to work as designed.

Any insights?


You need an acre or so of land with the proper soil type or
a serious borehole for ground source heat.

The deep tubelines are warm even in the depths of winter. I'm
surprised no-one has tried to harness that for heating. Not that
would help Croydon, the underground doesn't go there.