One of the advantages of a plunge pool is that its smaller water volume can make heating more manageable than heating a large swimming pool. But the choice of heating system still matters if you want comfortable temperatures without unnecessarily high running costs.
Why Heat a Plunge Pool?
Many plunge pools are designed for relaxation rather than short periods of cold-water swimming. Heating can extend the season and make the pool useful for considerably more of the year.
The ideal temperature depends on how the pool is used. A pool intended for exercise may be operated differently from one designed primarily for warm-water relaxation.
Air Source Heat Pumps
Air source heat pumps are one of the main options to consider for a modern pool. They extract heat from the surrounding air and transfer it into the pool water.
They are generally designed to provide efficient ongoing heating rather than the very rapid temperature increase associated with some traditional heating systems. Performance depends on outdoor conditions, the model selected and the way the pool is operated.
Gas Pool Heating
Gas heaters can provide a rapid increase in water temperature and can be useful where fast heating is a priority. They may be particularly attractive for pools that are used intermittently and need to be heated relatively quickly.
However, fuel costs and the wider energy efficiency of the installation need to be considered when comparing systems.
Solar Heating
Solar energy can contribute to pool heating, particularly during brighter months. In the UK, however, solar availability varies considerably throughout the year, so solar heating is often considered alongside another heating system rather than as the sole source of heat.
Why the Pool Cover Matters
Heating the water is only part of the equation. A large amount of heat can be lost from the surface when the pool is uncovered, particularly through evaporation.
An effective automatic or manual cover can therefore be one of the most important investments in an energy-conscious pool design. It can reduce evaporation, retain heat and help keep debris out of the water.
How to Heat a Plunge Pool Efficiently
- Choose an appropriately sized heating system.
- Use an effective pool cover whenever the pool is not in use.
- Consider insulation as part of the pool design.
- Use controls and timers to match heating to actual usage.
- Maintain the filtration and circulation system properly.
- Monitor temperatures rather than continuously overheating the pool.
Which Heating System Is Right for Your Pool?
The best option depends on how often the pool is used, the temperature you want, how quickly you need it to heat and the energy sources available at your property.
For many modern installations, the best solution is not simply choosing one technology but designing the heating, insulation, cover and controls as one system.
Read our guide to energy-efficient swimming pool heating or compare heat pumps and gas pool heating before making a decision.