Along with air conditioning, the pool is one of the biggest energy draws in a home during summer. The good news: there are concrete measures, some almost free, others requiring upfront investment but paying for themselves, that reduce that consumption without giving up swimming whenever you feel like it.
Three independent measures pointing to the same place: less energy consumed without giving up enjoying the pool.
The filtration pump: the consumption you can cut the most
The pump is the equipment that runs the longest of anything in the whole installation, so it's also where any improvement is felt most. Two real levers:
- Variable-speed pump: lets you filter at low RPM most of the time (enough to keep the water circulating) and only increase the speed when more flow is needed, for example with the automatic pool cleaner connected. A well-programmed variable-speed pump uses noticeably less energy than a conventional pump that always runs at full power.
- Off-peak pumping schedule: scheduling filtration to coincide, as far as possible, with the cheapest electricity time slots reduces the bill without changing anything about the equipment.
We go into more detail, including how to choose the right pump for your water volume, in our guide on how the pool pump works.
Thermal cover: reduces evaporation by up to 95%
Evaporation is, by far, the biggest cause of heat loss in an outdoor pool, much more than transmission through the pool shell's walls. A thermal cover reduces evaporation by up to 95% when used at night and on days with no swimming, which means less water to top up, less chlorine lost to evaporation and, if you have a heating system, less energy needed to maintain temperature. We cover this in our guide on pool thermal covers.
Heat pump: the most efficient way to heat your pool
If you want to extend the swimming season, a heat pump delivers 4 to 6 times more output than an electric resistance heater for the same energy consumed, because it doesn't generate heat directly but extracts it from the air. With a correctly sized unit, water temperature rises between 0.5 and 2°C per day, depending on conditions. Sizing and performance details are in our guide on pool heat pumps.
Other measures that add up
- LED lighting instead of halogen, if your pool has underwater lights: much lower consumption for the same brightness and a much longer lifespan.
- Checking the filter's condition: a dirty filter forces the pump to work harder to move the same volume of water, increasing consumption without you noticing it directly.
- A cover even in the off-season: besides saving energy, it reduces dirt getting in and makes the following season's opening easier.
- Correctly sizing the equipment from the start: a pump or heater oversized for your pool's actual volume uses more than necessary, permanently.
Where to start if you can only do one thing
If we had to prioritise, the thermal cover is usually the measure with the best ratio between investment and savings: moderate upfront cost, no building work or electrical installation, and an immediate effect on both water and temperature. After that, reviewing the pump's schedule and speed, which often just requires reprogramming the equipment you already have, is the second-best improvement in terms of return.