Getting the best temperature for hot tub use right makes all the difference in comfort, safety, and running costs. Whether you're easing muscle tension, relaxing after work, or hosting friends, knowing how to set the water temperature properly is key to getting the most out of your hot tub.
Let's take a closer look at what temperature is ideal, how it affects your energy use, and what's recommended for different people and seasons.
Most people use a hot tub for hydrotherapy , stress relief, or general relaxation. The warmth promotes circulation, soothes sore muscles, and encourages deep rest — but only when the temperature is properly set. If it's too hot or too cold, it can diminish the effects — and even pose health risks in some situations.
For example, overheating can lead to discomfort, dizziness, or dehydration. On the other hand, water that's too cool won't provide the same therapeutic benefits, particularly during colder months.
Temperature also impacts energy efficiency. Keeping the water at an optimal range helps prevent the heater from overworking and keeps electricity costs in check — especially in the UK's ever-changing climate.
And for families and seniors, maintaining a safe temperature isn't just about comfort — it's a matter of safety.
For most healthy adults, the ideal hot tub temperature falls between 37°C and 40°C. This range closely matches the body's natural temperature and offers a soothing, therapeutic soak without placing unnecessary strain on the body.
However, different users have different needs, and certain groups benefit from lower temperatures for both comfort and safety:
Children: Kids should only use hot tubs at lower temperatures—generally no more than 36°C—and for shorter durations. Their smaller bodies heat up faster, increasing the risk of overheating or dehydration.
Seniors & Users with Health Considerations: For seniors or individuals with reduced heat tolerance or medical conditions such as cardiovascular issues, a safer temperature range is 36°C–37°C. Always consult a healthcare provider if you’re unsure.
Post-Exercise Recovery: If you're using your hot tub after a workout to ease muscle tension, temperatures around 38°C–39°C can help—just be sure to let your body cool down first.
No matter who's using it, the golden rule remains: listen to your body. If you feel dizzy, overly warm, or flushed, it's time to take a break or lower the temperature.
The best temperature for hot tubs in the UK will vary slightly with the seasons. During winter, when the air is cold, most people enjoy a hot tub set around 39°C–40°C. This feels toasty and comforting without putting too much pressure on your heating system—provided your hot tub is well insulated and has a good cover.
In summer, however, it's often better to lower the temperature to around 36°C–37°C. The ambient heat means you don't need the water as hot to feel comfortable. Plus, this can help reduce your energy bills during the warmer months. Some even turn the heat off entirely to use their spa as a cool plunge pool on particularly hot days.
For those who like to use their hot tub year-round, investing in a model with strong insulation and an energy-efficient heater can help keep the heat consistent while saving energy.
Modern hot tubs come with digital thermostats that allow you to set the exact temperature. For safety and comfort, it's a good idea to start at 37°C and increase slowly if needed.
Several factors influence how well your hot tub retains heat:
What's the maximum temperature for a hot tub in the UK?
The recommended maximum safe temperature is 40°C. Going beyond that is not recommended due to safety regulations.
Can I stay in a hot tub at 40°C for more than 30 minutes?
It's best not to. Prolonged exposure can lead to dehydration and discomfort. Stick to 15–30 minutes at a time and always drink water to stay hydrated.
What temperature is best for muscle recovery and stress relief?
Between 38°C and 39°C is ideal for loosening tight muscles and calming the mind. This range is warm enough to encourage circulation without being overly hot.
Finding the best temperature for hot tub use depends on your personal comfort, health needs, and the time of year. Aim for a balance that delivers relaxation without running up your energy bill or compromising safety.
By keeping a close eye on your hot tub's temperature, you'll make sure every soak is comfortable, safe, and worthwhile—whether it's a chilly winter evening or a sunny summer day in the garden.
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