A heat pump is one of the most efficient pieces of equipment for extending the swimming season and ensuring a comfortable water temperature, usually between 27 ºC and 29 ºC.

With the right system, it is possible to start swimming earlier in spring and extend dips until autumn — and, in some cases, even use the pool all year round.

However, to correctly choose the ideal heat pump, it is important to consider several technical factors.

⚡ Heat pump power (kW)

The power of a heat pump is measured in kW (kilowatts) and determines the equipment's capacity to heat the pool water.

A simple way to estimate the necessary power is to use the following formula:

Pool volume (m³) × 0.3 = approximate power in kW

Although it is a simplified calculation, it helps to get an initial idea of the required power.

📌 Practical example

Consider a pool with:

• 6 meters in length
• 4 meters in width
• 1.5 meters average depth

The volume will be:

• 6 × 4 × 1.5 = 36 m³

Applying the formula:

• 36 × 0.3 = 10.8 kW

👉 In this case, a heat pump of about 10.8 kW would be recommended.

🌡️ Factors influencing actual power

Although the formula is useful as a reference, there are several factors that can increase the actual power requirement:

• Regional climate
• Desired water temperature
• Use of thermal cover (bubble blanket)
• Pool exposure to wind
• Geographical location (heating in Alicante is not the same as in northern Germany)

👉 All these factors can significantly increase the required power.

📊 Coefficient of Performance (COP)

The COP (Coefficient of Performance) is one of the most important indicators in choosing a heat pump.

It represents the ratio between:

• the thermal energy supplied to the pool water
• and the electrical energy consumed by the equipment

In simple terms:

The higher the COP, the more efficient the heat pump.

Manufacturers usually present the COP under different conditions:

• ideal conditions (favourable temperatures)
• more demanding conditions (lower temperatures)

👉 This allows for evaluating the actual performance of the equipment in different scenarios.

🏊 Conclusion

Choosing the right heat pump depends not only on the size of the pool but also on environmental conditions and equipment efficiency.

A good initial analysis ensures:

• better thermal comfort
• lower energy consumption
• greater system durability