Question 1

Are ground source heat pumps better than air source in Scotland?

Accepted Answer

Not necessarily. Ground source heat pumps achieve marginally higher SCOP (3.5–4.5 vs 3.0–3.8 for ASHP) but cost 2–3x more to install. For most Scottish homeowners, the financial case strongly favours air source heat pumps. Ground source makes sense for large rural properties with available land and heating demands above 25,000 kWh/year.

Question 2

How much land do I need for a ground source heat pump in Scotland?

Accepted Answer

Horizontal ground loops require 2–3x the heated floor area as trench length. For a 15kW system, expect 300–450m of trenching. Vertical boreholes need far less land—typically 2–4 boreholes 80–120m deep—but cost significantly more to drill.

Question 3

Do ground source heat pumps work in Scottish geology?

Accepted Answer

Yes. Scottish geology is generally favourable with high-conductivity granite, schist, and sandstone bedrock providing good thermal performance for vertical boreholes. Clay-rich soils in central Scotland work well for horizontal loops. A ground investigation survey confirms suitability before installation.

Ground Source Heat Pumps Scotland