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Pool covers to reduce heat loss


A pool cover or blanket is one of the best investments you can make.

They can be used on both indoor and outdoor pools. A good quality, well–fitted cover can immediately save you up to 50 per cent on energy costs because it helps to retain the warmth of a heated pool or spa as well as reducing water evaporation.

Pool covers can increase the pool temperature by 6 - 8 degrees in pools that receive sunlight, saving you on the cost of heating.

Maintenance savings 

A pool cover will also save you money and energy by improving water cleanliness.

  • Up to 90 per cent of debris like dirt leaves and insects can be kept out of the pool with a well–fitted pool cover
  • This improves the quality of your pool water, reduces the load on the cleaning system and saves on maintenance time
  • Fitting a pool cover may also reduce the amount of pool chlorine lost to the sun’s UV rays.

The type of cover that works best with your pool depends on the micro- environment the pool is located in.

Choose a pool cover 

Bubble covers 

Bubble covers can cut heat losses from a heated pool by as much as 75 per cent*. The translucent bubble covers trap heat from the sun and can warm your pool by as much as 7 degrees Celsius. Solar bubble covers are light coloured, allowing maximum solar energy to penetrate the pool and warm it. The air–filled bubbles form an insulating layer which prevents the warmth from being lost again. If the cover needs to be removed and replaced regularly get a roller to make this easier. If the cover is left rolled up in the sun it must be covered to prevent damage from overheating.

Thermal blankets 

Thermal blankets are designed to insulate the pool overnight by reducing evaporation and convection heat loss. They are not as thick as a bubble blanket, and a roller is still necessary.

Liquid pool covers 

These work by forming a liquid barrier on the surface of the pool. They are made from biodegradable ingredients which slow heat loss and water evaporation without affecting the chemical balance of the pool. They don’t need to a roller or removed and replaced as a traditional cover does.

Slat covers 

These covers have slats, which roll out onto the pool surface, similar to a horizontal garage door. Another variation achieves the same result by using sturdy material supported by metal rods at regular intervals. Because they are thermal insulators, both options operate like a thermal blanket. They reduce overnight heat loss and evaporation. Although slatted covers are usually installed during construction, they can also be retrofitted to existing pools.


* Swimming Pool Efficiency Guide, Ausgrid