As with all swimming pool heating systems, you are advised to use a pool cover when your swimming pool is not in use.

Using a pool cover is important for several reasons:

1. Energy Efficiency: A pool cover helps to reduce evaporation (the greatest heat loss), which in turn reduces the need for energy consumption and saves you money on heating costs.
2. A pool cover can cut total heat loss by 50% to 95%.
3. Less Maintenance: A pool cover reduces the amount of debris and dirt that falls into the pool, making maintenance and cleaning easier.
4. Water Quality: Pool covers help to prevent the growth of algae, bacteria, and other harmful microorganisms in the pool water, ensuring that your pool remains clean and safe to use.
5. Aesthetics: A pool cover protects your pool from the elements and keeps it looking great all year round, adding aesthetic value to your outdoor space.

Overall, using a pool cover provides numerous benefits that help to improve the safety, cleanliness, and efficiency of your pool, making it a worthwhile investment for any pool owner.