Ground source heat pumps take heat from the ground and use it to warm homes and buildings.
Unlike boilers, they do not burn fuel to create heat. Instead, they move natural heat from the earth into your home, making them a clean and highly efficient way to provide heating and hot water.
Even in winter, the ground a few metres below the surface stays at a fairly steady temperature. Because of this, ground source heat pumps can provide reliable heat throughout the year.
In simple terms, a ground source heat pump collects heat from the ground, boosts that heat, and moves it indoors.
What Is a Ground Source Heat Pump?
A ground source heat pump is a heating system that transfers heat from the earth into a building.
A simple way to understand it is to think of a fridge—but in reverse.
- A fridge removes heat from inside and releases it outside
- A ground source heat pump takes heat from the ground and releases it inside
Most systems include:
- Pipes buried underground, called ground loops
- A special fluid that flows through those pipes
- A compressor that raises temperature
- An indoor unit connected to radiators, underfloor heating, or hot water
- Controls that manage temperature and timing
Together, these parts move heat from the ground into your home.
How Heat Is Collected and Used
The system works in a continuous cycle.
1. Heat Is Collected from the Ground
A special fluid flows through long pipes buried in soil or rock.
As the fluid moves through the ground, it absorbs natural heat from the earth.
2. The Heat Is Boosted
The warmed fluid then passes into the heat pump.
Inside the system, a compressor squeezes the fluid, which raises its temperature significantly.
This turns low-level ground heat into useful heating for your home.
3. Heat Moves Indoors
Once heated, the system transfers that heat into your home’s heating circuit.
This allows the heat to move where it is needed.
4. Rooms and Water Warm Up
The heat then flows through:
- Radiators
- Underfloor heating
- Hot water cylinders
As a result, rooms warm up and hot water becomes available for taps and showers.
5. The Cycle Repeats
After releasing its heat, the fluid cools and returns underground.
It then absorbs more heat from the earth, and the cycle begins again.
This process repeats continuously while heating is needed.
Main Parts of a Ground Source Heat Pump
Ground Loops
These buried pipes collect heat from the ground.
They may run horizontally in trenches or vertically in deep boreholes.
Compressor
The compressor raises the temperature of the collected heat.
This is one of the most important parts of the system.
Refrigerant Pipes
These pipes carry heat around the system.
Indoor Unit
The indoor unit transfers heat into radiators, underfloor heating, or hot water storage.
Control System
The controls manage when the system runs and what temperature it aims for.
From Ground to Home
Heat moves from the ground into the buried pipes, then through the heat pump, and finally into your home.
Although the system uses electricity to run pumps and compressors, it produces much more heat than the power it consumes.
For example, 1 unit of electricity can often deliver 3–4 units of heat.
Because ground temperatures stay stable throughout the year, ground source heat pumps often deliver very consistent performance.
Why Ground Source Heat Pumps Matter
Ground source heat pumps can heat homes without:
- Burning gas or oil
- Producing carbon dioxide at the property
- Creating smoke or fumes
They also work reliably in every season and pair especially well with renewable electricity such as solar or wind power.
As a result, they can help reduce both carbon emissions and long-term energy costs.
In Short
Ground source heat pumps follow a simple cycle:
- Collect heat from the ground
- Boost that heat using a compressor
- Move the heat indoors
- Warm rooms and water
By repeating this cycle, they provide clean, efficient heating powered by the natural warmth beneath our feet.