Why sizing is critical
Oversizing is the most common mistake in aerothermal installations. A heat pump that is too large for the actual demand of the house operates in short cycles: it starts, quickly reaches the target temperature and stops. Each start-up is the moment of highest consumption and compressor wear. An oversized pump can have a 20–30% worse real SCOP than its nominal SCOP.
| Type of home | Typical thermal load | Recommended heat pump |
|---|---|---|
| Well-insulated 100 m² (cert. A–B) | 4 – 6 kW | Daikin/Panasonic/Vaillant 6–8 kW |
| Standard insulation 150 m² | 8 – 12 kW | Daikin/Panasonic/Vaillant 10–12 kW |
| Poorly insulated 150 m² (cert. E–F) | 14 – 20 kW | 16 kW or improve insulation first |
| New large home 200 m² (cert. A) | 8 – 14 kW | Daikin/De Dietrich 12–14 kW |
Official Installers in Alt Empordà
Enclos Instal sizing process
- Free technical visit: house measurement, inspection of existing insulation.
- Thermal load calculation (EN 12831 standard): formal calculation of required power.
- Model selection: choosing the heat pump that covers the calculated load with the best SCOP.
- Annual consumption simulation: estimate of real annual electricity cost and investment ROI.
- Detailed quote: itemised total cost, applicable subsidies and final net cost.
Frequently asked questions
Can a single heat pump be sized for both heating and DHW at the same time?
Yes. Modern heat pumps (Daikin Altherma, Panasonic Aquarea, Vaillant aroTHERM, De Dietrich Alezio) simultaneously manage the heating circuit and the DHW storage tank.