How spa covers reduce spa running costs.

Woman opening spa coverHow much does a spa cost to run?

This is a question we hear all the time and is similar to the age-old question: "How long is a piece of string?"

There are so many variables in every spa pool that it is different for each of us.

That being said, all spas and swim spas have one thing in common. They heat water which requires energy.

The number one area where heat can escape from your spa is through the cover.

Heat loss primarily occurs in these three ways:

Heat loss in your spa through Convection

Convection is caused by the transfer of heat by the circulation of a liquid or gas.

In a spa pool, this is most critical in the warm air between the water and the spa cover. A spa cover acts similarly to the lid on a saucepan by helping to keep the heat sealed in.

Convection cannot be eliminated so it is very important that your spa cover fits tight around the shell of your spa and is equipped with straps to keep the cover sealed against the rim of the spa to lock in the heat.

The most energy-efficient spa covers feature full-length hinge heat blocks. Without this, the un-insulated air gap between the spa cover sections will allow heat to escape. Some spa covers only have heat blocks on the outside edges of the hinges and this is less efficient.

In older or damaged spa covers, heat is transferred by the warm air into the water-logged cover. The water in the cover then transfers heat to the outside ambient temperature air. A waterlogged cover, which you can identify by its weight, is the number one cause of heat loss through a spa cover.

Make sure your spa cover has insulation cores that are heat-sealed in tough polybags.

Heat loss in your spa through Evaporation 

Evaporation is the changing of matter from a liquid or solid to gas.

When a liquid such as water evaporates, the very act of changing state causes cooling. We experience this when we sweat and when we use air conditioning or our refrigerator.

A spa cover prevents heat loss due to evaporation by locking out the ambient outside air. Once again a tight seal on your spa is critical in reducing heat loss by evaporation.


Heat loss in your spa through Conduction 

Conduction is the transfer of heat between two parts caused by a temperature difference.

Heat is always conducted from warm to cold via the shortest route, which in the case of the spa pool, is upward.

This is where the density of the foam core comes into play. The foam thickness is not the best way to measure the insulation value of spa cover as a thicker foam may take up more space but not have the same dense insulation properties

To save money, treat your spa cover well and replace it if it becomes damaged or waterlogged.

One tip is to invest in a spa cover lifter so that your spa cover is not dropped on the ground which can break the seal on the core bags and increase the likely hood of your spa cover becoming waterlogged.

Lastly, a tight-fitting spa cover not only locks in the heat you have paid for but it will also lock out organic debris such as dirt and dust which will reduce your spa chemical consumption.


View our range of Insulated Spa Covers


Need help measuring your spa cover? 

Watch our video below and download our helpful measurement sheet:

Download Measurement Sheet





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