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Advice for ground source heat pump in new build with PV and batteries

 
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Grounds Source Heat Pump (GSHPs)
Last Post by JamesPa 1 hour ago
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 gcon45
(@gcon45)
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Joined: 1 day ago
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Topic starter 06/05/2025 10:20 pm  

 

IMG 4494

@johnmo 

Very good point.

It’s something I should have given a lot more consideration.

I will contact my contractor to ask if it’s possible at this stage to change the open fire in this room to a sealed stove. I know it has been built to accommodate a fireback and has the lintel etc in place.


   
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Mars
 Mars
(@editor)
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Joined: 4 years ago
Posts: 3184
06/05/2025 10:21 pm  

Even though GSHPs are more expensive upfront, they generally offer a longer lifespan than ASHPs and significantly better SCOPs when well designed.

@barry-sharp, for example, has a system in Scotland achieving a SCOP of over 4.5, and if your budget allows, it’s definitely worth considering ground source seriously.

Yes, heating oil is currently around 50p per litre, but as we head into late autumn and winter, it’s likely to climb back toward 70p or more. In that context, a well-designed GSHP will almost certainly be far cheaper to run in the long term.

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 Johnmo
(@johnmo)
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Joined: 2 years ago
Posts: 455
06/05/2025 10:28 pm  

Posted by: @gcon45
↑

open fire in this room to a sealed stove.

When looking at room sealed stoves, you need to ensure primary and secondary air are taken from outside - some only take primary air from outside and secondary from the room.

Room sealed should only need a 100mm hole through the wall and this is then ducted to stove.

Maxa i32V5 6kW ASHP (heat and cooling)
6.5kW PV
13.5kW GivEnergy AIO Battery.


   
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 JamesPa
(@jamespa)
Illustrious Member Moderator
Joined: 2 years ago
Posts: 2416
07/05/2025 12:32 am  

Posted by: @gcon45
↑

I can try and find any bits of info that anyone thinks would be beneficial though?

The useful bit is the bit that specifies the heat loss at the design temp ( presumably around -3).

It's your choice of course but I genuinely fear that whoever is designing your heating system may be specifying something that you will not be happy with. 

I have no axe to grind, I'm not involved with the industry I'm just an interested amateur with a background in phisics who happens to have evaluated carefully what's been said here for the last two years and, as a result, has ended up with a very satisfactory ashp experience mosty by avoiding  installers that frankly were talking BS and being very careful about system sizing.

4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.


   
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