When homeowners begin researching low-carbon heating, one question comes up again and again: “Is a ground source heat pump the same as geothermal?”

The short answer is: they’re related, but not exactly the same thing. The longer answer is where things get interesting.

What Geothermal Actually Means

“Geothermal” technically refers to heat taken from deep underground — the Earth’s internal heat. Geothermal power plants tap into this to produce large amounts of renewable energy, usually in volcanic or geologically active regions.

In everyday language, though, people often use “geothermal” to describe any system that draws warmth from the ground. That’s where the confusion begins.

What a Ground Source Heat Pump Does

A ground source heat pump (GSHP) extracts low-grade heat from just below the surface — typically from around 1m down for horizontal loops to well over 100m for vertical boreholes. This isn’t volcanic heat; it’s warmth stored from the sun and rainfall. The ground stays at a relatively stable temperature year-round, which makes it incredibly efficient for heating homes and hot water.

The heat pump then upgrades that natural warmth using electricity, delivering comfortable, low-carbon heating.

So Are They the Same Thing?

Not exactly.

Here’s a simple way to think about it:

• Geothermal = deep Earth heat (geology)
• Ground source heat pump = shallow ground heat (solar energy stored in the ground)

Both use the ground as an energy source, but in very different ways and at very different temperatures.

In the UK, when someone says they want a “geothermal heating system” for a home, they almost always mean a ground source heat pump.

Why People Mix Up the Terms

There are three main reasons:

• Language — in some countries, “geothermal heating” is commonly used to mean ground source heat pumps.
• Marketing — the word geothermal sounds high-tech and sustainable.
• The ground connection — both approaches use the ground as the heat source, so it feels intuitive to link them.

From a homeowner’s point of view, the important part is the end result: efficient, low-carbon heating that reduces bills and emissions.

Is a Ground Source Heat Pump Right for UK Homes?

Ground source heat pumps perform particularly well in the UK because:

• The ground temperature stays relatively stable through winter
• Homes can be designed or upgraded for low-temperature heating
• Electricity is getting greener every year
• Running costs can be significantly lower than oil, LPG or direct electric

They pair beautifully with underfloor heating and well-insulated homes, but can also work with radiators when correctly specified and designed.

What About Planning and Space Requirements?

Most properties can accommodate a GSHP, but spacing and local ground conditions can influence whether:

• Horizontal pipework (trenches) or
• Vertical boreholes (drilled)

are the most suitable choice. Boreholes take up much less garden space and are often preferred where outside space is limited.

The Bottom Line

So, while a ground source heat pump isn’t technically “geothermal” in the geological sense, the two ideas sit under the same umbrella: renewable heating from the ground.

If you hear someone ask for “geothermal heating” in the UK, chances are a ground source heat pump is exactly what they’re looking for.

Thinking About a Ground Source Heat Pump?

Clear Skies Energy specialises in helping homeowners understand whether a GSHP is suitable for their property — including performance estimates, system design and installation support.

If you’d like an expert opinion or a no-obligation assessment, we’re here to help.

Get in touch with Clear Skies Energy today to find out whether a ground source heat pump is right for your home.