Anyone with a GSHP, or considering having one? Comments?
We considered it, but cost ruled it out. So have air source.
I too considered it, but despite having oodles of land to lay the pipes, the cost was high. Also have air source heat pump and think it a wise decision. I switch it on at start of winter, and just leave it on for the duration, tweaking the thermostat as needed but most of the time it just stays on 19/20.
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Another air source heat pump satisfied customer too. Electric costs much lower, stays on auto 24/7.
That’s interesting to know I thought it might have become affordable. I haven’t looked at it for thirty years when I had the land but it was a new technology and expensive. Since then underfloor heating has come down a lot in price an£ I thought ground source might have done the same.
Its the cost of the drilling (for vertical pipes) or excavating for horizontal pipe beds.
To maximise effeciency there should be a weather compensation sensor on a north wall if possible and not just a theromstat. Obviously low flow temperature is key if the emmiter sizing is correct to allow for that hence underfloor is great.
We had a GSHP system installed in 2009. As it was a complete renovation from the foundations up it was very practical to do the wet underfloor heating and get the insulation up to the max. Very happy with it. In retrospect I would install a pellet burner as back up assuming that a manual feed version exists. No idea about current prices but ours came in at €19k, less the tax credit of 50% on the heat pump itself, which was €5k
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I too had a GSHP (despite the original question), brought it over, new, from UK and installed it in the house we were building here. It fed underfloor installation of heating pipes.
Originally ‘fed’ input from well in garden. Worked ok, but was too small (8kW) for our floor surface; the original idea was to have that as basic background, with wood burner in the living area.
Was just about ok. But I decided the controller would be better sited in the main living area rather than next to the HP, which was in the basement. On disconnecting the controller I bu****ed up the HP electrics and never got it sorted.
FREE GSHP AND CONTROLLER AND HANDBOOK TO ANYONE WHO FEELS THEY CAN GET IT GOING. SOUTHERN DORDOGNE.
I replaced it with a s/h ASHP (Mitsubishi 16kW) found on leboncoin. Installed myself (except the gassing) and it worked fine for 10 years. But it was expensive to run (worst day it used 95kWh). Now moved house and want to replace oil-fired-to-radiators heating with borehole fed GSHP into same radiators. Don’t want slinkies.
Anyone had a borehole drilled?
On the external unit of the ASHP all the gas is contained in the unit as aposed to an AC where regrigerent pipes are fed into the fan core units. No F gas cert required.
Oh yes please, we’ve been trying to find something for a project here!
When I say the cost was high - I do not mean it was unaffordable. The air pump was just cheaper and less work to install.
I would like to have installed one but unfortunately the rock is about 300mm down.
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As is ours but I think it’s still doable with vertical holes.
Rock on! 
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Do you mean horizontal, toryroo? 300mm = 30cm = 1’. Even the horizontal systems need a minimum ideally of 0.75m, allowing for a sand layer under the pipes and 60cm above.
You are being generous Houpla, almost the frost line in some places 1200mm minimum depth. Preferably much deeper.
No vertical, we are on rock.
Us too. We couldn’t have had ground source anyway, too rocky, as the house is built on a granite outcrop.
That’s very expensive to drill a deep enough vertical channel. What rock are you on ? We’re on granite but have enough soil depth, just, to have a GSHP.
Is that a gaz/gaz system like the old Enalsa units or a more modern water/glycol system ? The old gaz/gaz systems usually use the older R404a or R410a gasses, and a lot of it, which won’t be available for servicing use after 2030.