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Advice Needed For New Ground Source Heat Pump System in SW Scotland

Ground Source Heat Pump (GSHPs)

Last Post by Transparent 3 weeks ago

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Wheatie

(@wheatie)

New Member Member

Joined: 4 weeks ago

Posts: 4

Topic starter 15/02/2026 3:27 pm

Hi Folks,

Looking for some valued advice regarding selecting a GS system for a new build installation.

Essentially we have an extensive plot size that would lend itself to a horizontal pipe installation - hence consideration of a GSHP.

Given that we have 'zero' experience with heat pumps, I would really appreciate what manufacturers we should look at in terms of reliability/efficiency/cost etc.

My friend has recently built a new home in Denmark and is really impressed with the NIBE GSHP (his previous property had a Thermia GSHP). We had a Viessmann gas boiler in a previous property and it never gave any issues.

Therefore we are considering NIBE and Viessmann initially....but on a deeper search other manufacturers are of course available - Thermia/Mastertherm/Stiebel Eltron/Vaillant to name a few.

In the first instance - are there any manufacturers to avoid completely; conversely are there some we should look closely at?

Apologies for the broad query......but I do appreciate that it is important to design the overall system correctly from the start.

If it helps we are in SW Scotland, and approx floor area of 200m2 (UF Heating plus x2no upstair bed rooms(rads)).

Look forward to hearing from you, and thanks in advance.

-W

This topic was modified 4 weeks ago by Mars

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Mars

(@editor)

Illustrious Member Admin

Joined: 5 years ago

Posts: 4351

15/02/2026 3:40 pm

Good luck on your journey, @wheatie

I’ve got a lot of time for NIBE, Viessmann and Stiebel Eltron as heat pump brands. NIBE have taken some flak over the past year or two around replacement parts availability, but in terms of engineering and performance they’re still very solid. Don't know much about Thermia, so can’t comment.

Once you’ve narrowed down the brands, I’d say the final decision should really come down to which one your shortlisted installers know inside out. The best heat pump in the world won’t perform if it’s not designed and commissioned properly, whereas a good installer working with a brand they fit week in, week out, will usually deliver better real-world results.

Have you got a shortlist of installers yet?

You mentioned horizontal loops... have you also looked at vertical boreholes? They’re more expensive upfront, but can be more space-efficient and often offer more stable ground temperatures over the long term.

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Wheatie

(@wheatie)

New Member Member

Joined: 4 weeks ago

Posts: 4

Topic starter 15/02/2026 3:53 pm

@editor

Thanks Mars - a little relieved that we are thinking along the right path in terms of manufacturers.

As far as installers are concerned - no, we have not gotten that far as of yet (grateful if you have any contacts in our area).

Our plot is ~6ac, so plenty scope for horizontal loops.

I'll reach out to the above x3no vendors and take it from there.

.....curve ball......we did have a wood burning stove included as part of the overall build, but now thinking it would largely be an ornament and superfluous to requirements for a thermally efficient new build with optimised HP......but welcome your thoughts.

Kind Regards,

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Mars

(@editor)

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Joined: 5 years ago

Posts: 4351

15/02/2026 4:03 pm

Posted by: @wheatie

↑

.....curve ball......we did have a wood burning stove included as part of the overall build, but now thinking it would largely be an ornament and superfluous to requirements for a thermally efficient new build with optimised HP......but welcome your thoughts.

Not a curve ball at all. We have wood burning stoves and if you live is a rural location they can be a lifesaver as we've discovered over the years. Power outages. The stoves are on and we can keep living areas warm. If temperatures drop below design temperatures (which is not that relevant to GSHPs, but definitely applicable to air source units) the stoves come on to help the heat pump. You don't have to use them, but I certainly wouldn't decommission or remove them.

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Transparent

(@transparent)

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Posts: 3093

15/02/2026 5:17 pm

I recommend talking with Kensa Heat Pumps who are a UK GSHP manufacturer.

They're nowhere near you geographically, but actually based almost as far as you can travel west in Cornwall before encountering the Atlantic Ocean.
I say "almost as far" since I'm ignoring a few small islands beyond Lands End... because that would just be Scilly.

Kensa will already have the geotechnical maps for your area of Scotland, and can evaluate four alternative strategies for the ground loop

sub-surface horizontal pipe runs known as a 'slinky', about 1.5m below ground level
one or more 'standard' depth boreholes, typically 100-200m deep
a single deep borehole of approx 400m, which can have significantly greater efficiency
drop the pipe into a tract of water, such as a river, loch or abandoned mine shaft

They can do a desk-study without visiting your site, but may already have an installer in your area.

Save energy... recycle electrons!

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Mars

(@editor)

Illustrious Member Admin

Joined: 5 years ago

Posts: 4351

15/02/2026 5:37 pm

Posted by: @transparent

↑

I recommend talking with Kensa Heat Pumps who are a UK GSHP manufacturer.

Not wanting to spread wild rumours, but I've heard concerns about Kensa's financial stability after they announced redundancy consultations for about 20% of their staff in October 2025 due to policy delays and funding uncertainties in the UK heat pump market. Reports highlighted staff feeling broken by the cuts, a CEO resignation shortly after and some debt mentions, though the company remains active with investor backing and recent project announcements.

Personally, I'd be cautious proceeding with a Kensa heat pump until things stabilise.

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WindyinSancreed

(@windyinsancreed)

Active Member Member

Joined: 3 years ago

Posts: 9

16/02/2026 11:41 am

I can't speak to Kensa's financial condition, but their kit is excellent and their customer support is OUTSTANDING.

2x 9kW Kensa Evo GSHPs
3.8 Kw solar
10 kWh batteries

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Toodles

(@toodles)

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Joined: 3 years ago

Posts: 2631

16/02/2026 5:05 pm

@windyinsancreed They don’t use an AI Chatbot then?😆

Toodles, heats his home with cold draughts and cooks food with magnets.

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WindyinSancreed

(@windyinsancreed)

Active Member Member

Joined: 3 years ago

Posts: 9

16/02/2026 6:26 pm

@toodles Not at all! We usually g0t a very helpful Cornishman within 5 minutes who took as much time as needed to talk us through any needed diagnostics/reconfiguration. We had two heat pumps configured to make the most of dirt cheap overnight juice and it took a bit of trial and error to perfect the configuration.

This post was modified 3 weeks ago by WindyinSancreed

2x 9kW Kensa Evo GSHPs
3.8 Kw solar
10 kWh batteries

👍

🙏

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Transparent

(@transparent)

Famed Member Moderator

Joined: 4 years ago

Posts: 3093

16/02/2026 7:00 pm

Posted by: @windyinsancreed

↑

We usually g0t a very helpful Cornishman within 5 minutes who took as much time as needed to talk us through any needed diagnostics/reconfiguration.

That's quite normal.

Time goes more slowly here in the West Country. 😉

Save energy... recycle electrons!

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