GSHP - installation by previous owners was unsuitable - in loft of oak framed house. Too much noise and vibration and eventually failed. However we didn't know anything about them so didn't see the problem until too late! Our chosen option was to replace with a modern variable output unit placed outside the main building. This seems to work ok but did require some bedding in, including a visit from the manufacturer. The existing underfloor heating arrangements still are placed in the loft which isn't ideal.
So our recommendation is to get an expert opinion before you buy anything as complicated as this. The ROI can be over an extended period which also needs to be factored in.
The Solar Panels seem to work efficiently and as long as we remember to submit a meter reading each quarter then everything works smoothly.
This has been a very stressful experience complicated by the previous owners not providing as much information as they could have. After 10 months or so of no central heating we now have a GSHP which seems to be delivering what it promises. Still too early to say how efficient but looking ok.
We have learnt an awful lot about this at a rapid rate.
The key thing is picking the right supplier covering the right scope as this can save an awful lot of stress and money.
Speak to independent experts before committing.
Can be very efficient with the right choices.
Ensure that all aspects are covered by your supplier including groundworks, housing / building, electrical and plumbing. This is to ensure a 1 stop solution for any issues.