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Purchasing a geothermal heat pump is a significant investment that will affect the energy efficiency and operating costs of a property for decades to come. A properly sized and selected geothermal system can reduce heating costs by up to 80%. In this guide, we will go through the most important factors in choosing a successful geothermal solution.
The sizing of a geothermal heat pump directly affects the system's operation and profitability. An undersized system consumes a lot of electricity for additional heating, while an oversized system becomes unnecessarily expensive and runs for suboptimally short periods.
The sizing of ground source heat pumps takes into account the property's heating energy needs, domestic water consumption, and soil properties. Geothermal heat pumps can be dimensioned either as full or partial capacity: full capacity dimensioning covers the entire heating requirement even in severe frosts, while partial capacity dimensioning utilizes electric heaters in extreme frosts.
The heat collection circuit is the heart of a geothermal system. Its dimensioning and implementation largely determine the system's efficiency. Options include:
Borehole
The most common solution in densely built-up areas. A borehole (also known as a energy well (as the name suggests) typically extends to a depth of 100-400 meters and provides a consistent source of heat year-round. The quality of the bedrock and groundwater conditions affect the efficiency of the well.
Horizontal piping
Suitable for plots with sufficient space. The piping is installed to a depth of approximately one meter. The moisture and quality of the soil significantly affect the efficiency. Typically requires 1.5-2.5 times the area of the building to be heated.
Water installation
Possible on shore or waterside plots. The piping is anchored to the bottom of the watercourse. Provides good heat output, but requires special expertise in design and installation.
The key criteria when choosing a ground source heat pump are:
Efficiency (COP/SCOP)
It tells you how efficiently the pump converts electrical energy into heat. Modern pumps typically have a seasonal coefficient of performance (SCOP) of 4.5-5.5.
Compressor technology
Inverter pumps adjust their power steplessly according to need. On/off pumps run at full power and stop when the temperature is reached. Inverter pumps are more energy efficient and modern solutions.
Domestic water yield
If your hot water consumption is high, you may want to choose a pump with a separate hot water tank or an efficient superheater. This will ensure sufficient hot water production even during peak consumption times.
A successful geothermal project begins with careful planning. The process includes:
Energy demand mapping
We analyze the property's current energy consumption and future needs, taking into account any changes, such as renovations or expansions.
Soil research
We will determine the soil properties of the plot and select the most suitable heat collection method. If necessary, we will conduct test drilling to ensure the quality of the bedrock.
Permits and regulations
We take care of the necessary permits and ensure that the plan meets all regulations. Nowadays, geothermal energy usually requires an operating permit.
The profitability of geothermal investment is affected by:
Energy price
The increase in electricity prices will improve the profitability of geothermal heat. The system will significantly reduce the need for purchased energy.
System size
In larger projects, the investment pays off faster. The typical payback period is 5-10 years.
Subsidies and funding
Take advantage of available energy subsidies and household deductions. We also offer flexible financing options.
Sizing and selecting a ground source heat pump requires expertise and careful planning. Successful implementation guarantees comfortable indoor heat and significant savings for decades to come. We will help you through the entire process, from planning to implementation and maintenance.