The geothermal heat pump is one of the most efficient heating systems on the market. It draws on the energy stored in the ground to heat a home sustainably and economically. Although its initial cost is higher than that of an aerothermal heat pump, its exceptional efficiency and longevity make it a solution to be seriously considered, particularly for new-build properties. Here’s a complete study of its profitability.
How a geothermal heat pump works
The geothermal heat pump extracts heat from beneath the surface of the ground, using horizontal or vertical collectors. This heat is then transferred to the home’s heating circuit, via a heat transfer fluid. It can supply underfloor heating, low-temperature radiators or a hot-water tank.
Initial investment
The installation of a geothermal heat pump represents a substantial budget, generally between €15,000 and €25,000, depending on the surface area to be heated, the type of collectors (horizontal or vertical) and the characteristics of the land. This cost includes the thermal study, drilling or earthworks, equipment, commissioning and labor.
Operating costs
Once installed, the geothermal heat pump consumes very little electricity (mainly to run the compressor). With a coefficient of performance (COP) often in excess of 4, it produces 4 kWh of heat for every 1 kWh of electricity consumed. This significantly reduces your annual energy bill, by up to 60-70% compared with a conventional boiler.
Service life and maintenance
Geothermal systems are renowned for their robustness: buried collectors have a life expectancy of 50 years, and the indoor module can operate for over 20 years with proper maintenance. Maintenance is limited and inexpensive, as there is no combustion and no parts subject to extreme temperatures.
Aids and subsidies available
In Belgium, there are a number of bonuses available to reduce the cost of purchase and installation. Amounts vary according to region (Brussels, Wallonia, Flanders), household income and housing type. A preliminary study can also help to identify any assistance linked to the building’s overall energy performance (PEB). These incentives increase the profitability of the investment.
Return on investment
Depending on the cost of installation, subsidies received and energy savings achieved, the average return on investment for a geothermal heat pump is between 8 and 15 years. In a new, well-insulated house, this timeframe can be shortened. What’s more, the property value of a house equipped with a geothermal heat pump is a long-term advantage.
Conclusion
The geothermal heat pump represents a significant investment at the outset, but its longevity, energy efficiency and savings make it a particularly cost-effective solution over the long term. It’s a wise choice for households that want to reconcile thermal comfort, sustainability and cost control.
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