Can I start heating my pool with a heat pump in March?

When the fine weather begins to show its face in spring, many people dream of being able to enjoy their pool. But can you really consider heating your pool with a heat pump as early as March? Let's take a look at the key factors to consider when answering this question.

Factors influencing the performance of a pool heat pump

Before deciding whether March is the right month to use a heat pump to heat your pool, there are a few key parameters to consider.

Outdoor climate

Of course, outdoor temperature plays a crucial role in heat pump performance.

In fact, heat pumps are designed to capture calories from the outside air to heat the pool water. The milder the climate, the less effort the pump will have to make to produce heat.

Geographical location

Depending on your location, March weather conditions can vary considerably. It is therefore It's important to take a look at the average temperature data for your region. to find out about your pump's performance potential.

So, while some regions remain below 10°C in the morning, the south is already around 15°C, and the whole of France will be well above 10°C all day long.

Pool insulation

Often overlooked, the insulation of a swimming pool has a major influence on its ability to maintain a pleasant temperature. Good thermal insulation limits energy losses and improves heat pump efficiency.

A mere 5cm of foam insulation, for example, could reduce your costs by 60 to 70% to keep your water at temperature, which is cost-effective in the long term.

What's more, a tarpaulin is preferable when the pool is not in use, to try and maintain a certain temperature and save the electrical energy that would otherwise be consumed to raise the temperature via the heat pump.

Pool heat pump performance

To heat a pool with a heat pump, it's essential that the difference between the outside and inside temperatures of the pool is not too great. A difference of 8 to 10°C seems a realistic target. For example, if the outside temperature is 15°C, it would be possible to obtain a water temperature of around 23-25°C.

Knowing that water temperature starts to be pleasant around 28°C, you can set an outside temperature of around 16-17°C to start using your PAC piscine.

Air/water heat pump

The most common type of heat pump for heating swimming pools is the air-to-water pump. This model uses the outside air as an energy source to heat the pool water through a heat exchanger.

Under ideal conditions, an air-to-water heat pump can achieve a coefficient of performance (COP) of between 3 and 5.This means that it produces 3 to 5 kWh of heat for every 1 kWh of electricity consumed.

The advantage of this performance is that you can economically afford to heat up your pool water a little earlier without putting too much of a strain on the heating budget.

Recommendations for heating your pool in March

  1. Ensuring optimum insulation pool: cover the pool with a tarpaulin when not in use to conserve heat;
  2. Choose a heat pump suited to your location: select a model that offers the best possible performance for the climatic conditions in your region;
  3. Check the outside temperature: it's best to avoid starting the pump when it's too cold.

In the end, it's not impossible to heat your pool with a heat pump as early as MarchIf the weather's going to be gloomy and cold, it's wiser to wait a few more weeks before taking full advantage of your heated pool. On the other hand, if the weather is certain to remain cold and gloomy, it would be wiser to wait a few more weeks before taking full advantage of your heated pool.

Julien G.

Juliena mechanical engineering graduate and specialist in climate engineering since 2009, has become a writer specializing in renewable energies, with expertise in heat pumps and photovoltaic solar panels for individual housing.
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