I intended to wait a full 12 months, which will be in July. But there’s not much to say really, other than it’s performed excellently. Here’s the live data: https://heatpumpmonitor.org/dashboard?id=748
Averaged a COP of 4.7 for space heating and 4.2 for DHW. Which make it less than half the running cost of oil, before the price increase in oil!
The house has been super comfortable, we keep it 20C-21C 24/7. The heat loss has been slightly higher than I estimated, bit this is because I’m in the process of upgrading the loft insulation. Half the house currently has no loft insulation, since I’m doing other renovation work and installing MVHR. Next year should see a significant energy reduction with 300mm of loft new loft insulation and MVHR 