I've just about finished my ground-source heatpump project, it's installed and been running well for the last 3 weeks here - it provides all the heating for our house now, and the gas boiler has been switched off. If it goes wrong, there's a changeover switch so that the gas boiler can be swapped back in - success will be judged in a few months by that switch being left alone by my wife!
Many thanks to all on this website that have provided such great information, I'm not sure I would have started it without that.
I've written it up into a long pdf that's attached - I thought it would keep all the information together for an easier read for anybody else who was interested similarly.
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