How do solar pool heaters work?

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Solar heating for pools has traditionally been done by pumping water through rooftop tubes heated by the sun.

While this method uses large roof areas, it's nowadays viewed as inefficient when the same space could host solar panels producing electricity for various uses, including pool heating via an electric heat pump.

Currently, the most efficient method is using a solar electricity powered hot water heat pump. Solar rings and squares, as well as solar pool covers, offer alternative ways to heat your pool.

How does solar pool heating work and is it efficient?

Traditionally solar pool heaters were undertaken via installing specific tubing or matting on a nearby roof.  These tubes then had water pumped through them, and the sun’s heat would heat the water, which would then be returned to the pool and increase its temperature.

However, studies indicate that this isn’t the most efficient utilisation of a large roof space. Nowadays, this space could be better utilised for installing local solar panels to generate electricity. That renewable electricity can then power a home with many appliances, including pool pumps and even pool heating, via an electric heat pump.

An alternative popular option for pool heating has been via gas hot water heating. However, with the increasing cost of natural gas, this has become a costly method to heat pool water and is declining in popularity in all households other than the ones where one has more money than sense.

Solar hot water heat pumps

One option, but likely not the top option, is to buy a solar pool pump and still keep the solar hot water matting or tube heating. Installing a DC-powered solar pump to move the water can achieve savings. The pump, powered by sunlight, moves the hot water to the roof, where it heats within the matting or tubes using solar energy

This proposal will save some grid electricity as we now power the pump with solar. It nevertheless does not overcome the need to use valuable roof space to heat the water. So this method is reducing in popularity fast.

friends enjoying pool heated by solar

Heat pumps and solar can heat a pool efficiently

The most efficient way to heat pool hot water is using solar pool heaters. The heat pump runs on electricity but efficiently extracts heat from the surrounding air, transferring it via a condenser to heat the water.

Rather than using electricity from the grid, the electricity can be generated from solar panels to power the heat pump with cheap solar. Also, heat pumps are very efficient and use less electricity.

There are also several other ways that you can heat your pool with solar, including:

  • Solar rings and squares
  • Solar pool covers

 Solar rings and squares

Solar rings and squares, like solar pool covers, are separate floating devices that harness solar energy. They consist of a lightweight polymer with an air-filled chamber that absorbs sunlight and transfers heat to the water. Installing and removing these devices is easy, and they can be relocated to maximise sun exposure.

Solar pool covers

Solar pool covers, also known as solar blankets or pool blankets, are an inexpensive and simple way to heat your pool. These coverings are constructed of a robust and UV-resistant material that floats on the water’s surface. They function by absorbing the sun’s heat and reducing evaporation, thereby preserving heat in the pool. Solar coverings can enhance the temperature of the water by a few degrees while also reducing heat loss overnight.

smiling boy swimming in pool
There are a few crucial factors when considering to use of solar pool heaters

Pool size and environment

The size and number of solar panels or other solar devices needed to efficiently heat your pool depends on your pool’s size and the environment in your location. Larger pools or colder climate regions may need a more powerful solar heating system.

Direction and sun exposure

The direction and sun exposure of your pool and surrounding region are critical for maximising solar heating effectiveness. Avoid shade from adjacent trees, buildings, or other impediments to ensure that the solar panels or other heating equipment receive adequate sunshine throughout the day.

Pool insulation

Improving the insulation of your pool will assist in retaining the heat generated by solar energy. Consider using a pool cover and insulating pool walls and floors during the build or when not in use to decrease heat loss.

Using solar energy to heat your pool is both environmentally beneficial and cost-effective. When deciding on the best solar pool heating method, consider your pool’s size, climate circumstances, sun exposure, and poor insulation. You may enjoy warm pool water and extend your swimming season by utilising sun power with the correct design and installation

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