Well it did come in and it does come to thousands! - but that is because it goes back to 2005; since it also credits us with payments since then we actually do not end up owing anything net - but the sheer complexity of the system (not to mention the length of the bill) is astonishing! Maybe it is not so bad to have it all itemized in one place - but why, exactly?!
Otherwise the sensor system now includes a switch on one of the GSHP-only phases (ie on if on & VV) so the average power it consumes can be monitored, on the assumption that it always draws the same if on (which seems true).
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