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Robl · 03-02-22, 03:49 AM

I think the advantage is that there's less surface trenching needed than with lots of boreholes spread around your garden - you can usefully drill several shallow angled boreholes from one location, then plumb them together in an access pit. If you have a big drill, I think I'm right in saying one big borehole is better, but that drill rig will be more expensive. A pro install I think always drills one or two very deep holes, but I expect costs more.

I did consider for some time having multiple 5m-10m deep boreholes, connected together as "AC Hacker" did - he has a great thread on it, which was my inspiration! I used a trencher for our diy gshp to avoid so much manual labour - lots of details on another thread.

Yuri - our thoughts are with Ukraine in these trying times.

03-02-22, 03:49 AM	#11
Robl Helper EcoRenovator Join Date: Oct 2020 Location: Cambridge, UK Posts: 31 Thanks: 3 Thanked 27 Times in 14 Posts	I think the advantage is that there's less surface trenching needed than with lots of boreholes spread around your garden - you can usefully drill several shallow angled boreholes from one location, then plumb them together in an access pit. If you have a big drill, I think I'm right in saying one big borehole is better, but that drill rig will be more expensive. A pro install I think always drills one or two very deep holes, but I expect costs more. I did consider for some time having multiple 5m-10m deep boreholes, connected together as "AC Hacker" did - he has a great thread on it, which was my inspiration! I used a trencher for our diy gshp to avoid so much manual labour - lots of details on another thread. Yuri - our thoughts are with Ukraine in these trying times.