Well the pump and exchange tank have been delivered. There might be a small expansion tank missing or not.
The trenches have sunk 70mm or so in places (which is a pity for the re-seeded grass). The 3-phase electricity installation grinds forward; it has been passed to the contractors and they have appointed a project manager who wants to see the site, with luck this week. Expect more delays before an actual date can be agreed!
We did think about using the cold ground in summer to provide 'free' cooling by circulating the coolant from the ground loop into special fan convectors or a 'VBX' system. Apparently this is normal anyway in Scandinavia in order to re-heat the ground, though not here. With thermal timescales of centuries (?) for the boreholes we maybe should keep watching the coolant return temperature for a few years! The cooling of the house may be a marginal value except for a few days each year.
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