Whether it is cheaper to leave a hot tub on all the time depends on various factors, including the efficiency of your hot tub, whether you are going to use the hot tub through the colder months, and your usage patterns.

Here are some considerations:

Hot Tub Efficiency:

Energy-efficient hot tubs with good insulation and efficient heaters are designed to maintain temperature with minimal energy usage.

For these models, it can often be cost-effective to leave them on, as they require less energy to maintain a set temperature than to heat the water from cold each time.

how much does a hot tub cost to runhow much does a hot tub cost to run
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Usage Patterns:

If you use the hot tub frequently ( say several times a week), it is generally more cost-effective to leave it on, as heating the water from scratch for each use consumes a significant amount of energy.

If your usage is sporadic, you might save by turning it off and only heating it when needed.

Thermal Cover:

A high-quality hot tub cover significantly reduces heat loss and evaporation, making it more economical to leave the hot tub on.

Make sure the cover is insulated and fits well to maximise energy efficiency.

hot tub covers minimise evaporation and retains water temperaturehot tub covers minimise evaporation and retains water temperature
thinking about hot tub running coststhinking about hot tub running costs

Operating Temperature:

Lowering the set temperature when the hot tub is not in use can save energy.

You don't have to keep the hot tub at its highest set temperature continuously.

Climate Considerations:

In colder months, the energy required to heat the water from a lower temperature can be substantial, favouring leaving the hot tub on with a tightly fitting cover.

During the warmer months, this consideration is less impactful and turning it off (and emptying if the hot tub will not be used for long periods) when not in use could be a viable option.

hot tub in cold temperatures needs better insulationhot tub in cold temperatures needs better insulation

Ultimately, many people find a balance by keeping the hot tub on but lowering the temperature slightly when not in use and using a good cover to minimise heat loss.

Performing a cost analysis based on your specific hot tub and electricity rates will give you a clearer picture of potential savings.

It might also be helpful to consult with the manufacturer’s guidelines or seek advice from hot tub professionals.