The problem: swimming pools send consumption soaring in summer

During the hot months, household electricity consumption changes completely. The air conditioning runs for longer, the fridge works harder, and small, everyday electricity uses that go unnoticed begin to add up.

If you also have a pool, your energy expenditure increases significantly.

The filtration system needs to run daily to keep the water clean, prevent the growth of microorganisms, and guarantee proper filtration. The problem is that, in many homes, it is scheduled precisely during the hours when electricity is most expensive.

In other words, when the use of air conditioning, the kitchen, and other household appliances coincides with the times of highest energy demand in Spain.

That is why an increasing number of households are optimising their habits and shifting certain consumption to the cheapest times of the day, thereby improving home energy efficiency without sacrificing comfort.

How much does a pool pump actually consume?

A pool pump's consumption depends mainly on its power capacity and the number of hours it runs each day.

In a standard home, a domestic pump typically draws between 0.75 kW and 2 kW of power.

It might seem like a moderate expense, but its cumulative impact over the entire summer is significant.

For example:

• A 1 kW pump running for 8 hours a day can consume around 240 kWh a month.
• If it runs during peak hours, the cost of this electricity consumption increases noticeably.
• If it is scheduled during off-peak hours, the expense can be reduced without decreasing the number of filtration hours.

The key is understanding that the pool needs daily filtration, but not necessarily during the most expensive periods.

In fact, in many homes it is more efficient to schedule the pool pump during the night, when electricity prices are lower and overall energy demand drops.

The time bands that make the difference: when is electricity cheapest?

Time-of-use tariffs set different electricity prices depending on the time of day.

Generally speaking, they are divided into:

• Peak hours, the most expensive.
• Shoulder hours, with a mid-range price.
• Off-peak hours, the cheapest.

You can read about how these periods work in our article on peak, shoulder, and off-peak hours: what they are and when they apply.

Off-peak hours are usually concentrated during the early hours of the morning, between midnight and 08:00, as well as at weekends and on national public holidays.

For a home with a pool, this price difference can be key to saving on the electricity bill, especially if the filtration system runs for several hours a day.

Furthermore, you can check the price of electricity today: what time is it cheapest on a daily basis to adjust your pump's operation to the most economical times.

How to schedule the pump during off-peak hours: a practical guide

The most efficient way to optimise your pool's consumption is to schedule the filtration system to run during off-peak hours.

Most modern pumps include a timer or programmer, which makes automation easy without the need for complex adjustments.

Before changing the schedule, you should make sure the pool completes the recommended number of filtration hours based on its volume, temperature, and usage.

Once that time is defined, the next step is to concentrate it into the cheapest periods:

• 00:00–04:00.
• 05:00–08:00.

With this schedule, you take advantage of almost the entire off-peak band and keep the water in optimal condition.

In addition to the financial savings, scheduling the pool pump at night has other advantages:

• It avoids concentrating consumption during times of highest demand.
• It improves the home's energy efficiency.
• It reduces noise during the day.
• It helps to better distribute the household's electricity usage.

And there is an important point worth remembering: the pool does not need to be filtered while it is being used.

The pump's function is to maintain water quality through continuous filtration cycles, not to perform an immediate clean while people are swimming.

Just as with other summer consumption, small changes in your habits can make a real difference. In this article on 10 tricks for summer with and without air conditioning, you will find more ideas to reduce your home energy expenditure during the hot months.

The weekend trick: why August is the cheapest month for your pump

Time-of-use tariffs offer a particularly interesting advantage for pool owners: weekends and national public holidays usually remain at the off-peak price all day long.

This allows you to extend the number of filtration hours without taking on the higher weekday costs.

Moreover, August typically coincides with:

• Greater use of swimming pools.
• More time spent in second homes.
• A general increase in household electricity consumption.
• Greater pressure on the grid at certain times.

That is why it is especially important to avoid the peak energy demand bands. You can see how this behaviour is distributed in our analysis of what time electricity consumption skyrockets in Spain.

Is a time-of-use tariff worth it if I have a pool?

In most cases, yes.

If the pool pump runs for several hours a day and can be scheduled at night, a time-of-use tariff usually offers a clear financial advantage over a fixed-price tariff.

Especially if you also shift other usage to off-peak hours, such as:

• Washing machine
• Dishwasher
• Electric water heater.
• Charging your electric car.

You can compare both models in this article on electricity tariffs: fixed price vs. time-of-use.

And if you are looking for an option tailored to these types of consumption habits, the Conecta 3 Periodos Tariff allows you to optimise your electricity consumption according to the different time bands.

Common mistake: running it while using the pool

One of the most common habits in summer is to turn on the filtration system while people are swimming.

However, from a technical and energy perspective, this is unnecessary.

Water quality depends on the total filtration time of the pool, not on the pump running while it is being used.

Therefore, barring specific situations involving heavy use or special treatments, the most efficient approach is to concentrate filtration during the night.

In addition to reducing the cost of your bill, this helps optimise electricity consumption and avoids increasing demand during the hours of greatest pressure on the electricity system.

Ultimately, the pool pump can become one of your main expenses in summer, but it is also one of the easiest to optimise. Scheduling it correctly, taking advantage of off-peak hours, and adapting its use to the times when electricity is cheapest are small changes that can help you save on your electricity bill without sacrificing comfort.

FAQs

How many hours should the pool pump be left running?

It depends on the size of the pool, the temperature, and the level of use. In summer, it is common to keep it running for between 6 and 8 hours a day, although during heatwaves it may be necessary to increase the filtration time.

What time is it cheapest to run the pool pump?

It is highly recommended to take advantage of off-peak hours, which generally fall between midnight and 08:00. Weekends and national public holidays also remain at the off-peak price all day long.

How much does a pump timer cost?

Basic timers usually cost between €10 and €30. Digital or smart models allow you to better automate its operation and optimise energy consumption.

Can I use the pool while the pump is off?

Yes. In a domestic pool, the filtration system does not need to run while people are swimming, provided that the recommended number of daily filtration hours is properly met.