|Before the alteration|
Then the plumbing for the Tubes needed re-organising, as the evacuated tube plumbers got the Supercal 539 energy meter and sensor in the wrong way round. Wasn't entirely their fault as they didn't ask, I assumed they would know. Perhaps I will change that old energy meter as the old meter has limited battery life left, and it was failing before. I phoned the supplier and they say that the battery is not replaceable. The whole unit has to be replaced after 6-8 years. It may be almost that old already!
I added back in my old pump, because it will be needed in future to push ground loop liquid through the heat exchanger when it comes in. Above is the plumbing before, and below is taken after the work is done. So far, no leaks observed, so I have now also insulated the pipes.