How to Keep Your Hot Tub Warm in Winter and Reduce Heat Loss

There’s nothing quite like stepping into a warm, bubbling hot tub on a cold winter evening. Whether you're relaxing after a long day or enjoying your garden with family and friends, a hot tub can be just as enjoyable in winter as it is in summer.

However, when temperatures drop, keeping your hot tub warm can become more challenging. Cold air, wind and poor insulation can all contribute to heat loss, meaning your hot tub may need to use more electricity to maintain its temperature.

The good news is that there are several ways to keep your hot tub warm in winter while helping to reduce unnecessary energy consumption.

In this guide, we'll explain how to reduce heat loss, improve your hot tub's efficiency and enjoy your hot tub throughout the colder months.

1. Invest in a Good-Quality Insulated Hot Tub Cover

One of the most important ways to keep your hot tub warm in winter is to use a good-quality insulated cover.

Heat naturally rises from the surface of the water, and an uncovered hot tub can lose heat quickly, particularly when the outdoor temperature is low. A properly fitted cover helps trap heat inside the hot tub while preventing cold air and debris from entering the water.

For the best results:

• Keep the cover securely in place whenever your hot tub isn't being used.
• Check that the cover fits snugly around the edges.
• Inspect it regularly for damage, waterlogging or signs of wear.
• Replace a damaged or poorly fitting cover when necessary.

A well-maintained cover can make a significant difference to heat retention, particularly during cold and windy weather.

Top tip: If you're buying a new hot tub, pay close attention to the quality of the cover and the overall insulation system. These features can have a real impact on long-term running costs.

2. Choose a Hot Tub with Good Insulation

If you're shopping for a new hot tub, insulation should be one of your main considerations, especially if you plan to use it throughout winter.

A hot tub loses heat through several areas, including the water surface, cabinet, plumbing and surrounding structure. Effective insulation helps slow this process down, allowing the heating system to maintain the desired water temperature more efficiently.

When comparing hot tubs, look for:

• Effective insulation around the shell and cabinet.
• Well-insulated plumbing and pipework.
• A high-quality, insulated cover.
• An efficient heating and circulation system.
• Clear information about energy consumption and running costs.

Not all hot tubs are built in the same way, so it's worth comparing the specifications of different models before making a decision.

A well-insulated hot tub may cost more initially, but it could offer better value over time depending on how often you use it, your energy tariff and the model you choose.

3. Protect Your Hot Tub from Cold Winds

Wind can increase heat loss by removing the layer of warm air around exposed surfaces. Even with a good cover, a hot tub in a particularly exposed location may be more difficult to keep warm.

Fortunately, a few simple changes to your garden can help.

Consider positioning your hot tub in a sheltered area, away from the strongest prevailing winds. Fencing, privacy screens, hedges and suitable outdoor structures can all help reduce exposure.

A pergola or gazebo can also create a more comfortable space for winter use, although it won't necessarily provide significant insulation on its own.

Before installing any screening or shelter, make sure there's sufficient ventilation, safe access and adequate clearance around the hot tub for servicing and maintenance.

If you're planning a new installation, thinking carefully about the location from the beginning can make winter ownership more comfortable.

4. Keep Your Hot Tub at a Consistent Temperature

Should you turn your hot tub off when you're not using it, or keep it running throughout winter?

For many regular hot tub users, maintaining a consistent temperature can be a convenient option. It avoids having to reheat a large volume of water whenever you want to use it.

However, keeping the water hot continuously isn't automatically the cheapest option for everyone. The best approach depends on your hot tub's insulation, the outdoor temperature, how frequently you use it and how much energy is required to reheat the water.

If you use your hot tub several times a week, maintaining a steady temperature may be practical. If you only use it occasionally, a lower temperature setting may be worth considering, provided your manufacturer's instructions allow it.

Always follow the manufacturer's guidance on temperature settings, water care and winter operation.

Important: Never switch off a hot tub or its heating system without checking the manufacturer's winter guidance. During freezing conditions, water left in the plumbing can freeze and cause expensive damage. If you're not going to use your hot tub for an extended period, follow the correct winterisation procedure.

5. Avoid Leaving the Cover Off for Too Long

It's tempting to leave your hot tub uncovered while chatting with friends or preparing to get in, but doing so for extended periods allows heat to escape.

This can be particularly noticeable during cold, windy weather.

To minimise heat loss:

• Remove the cover just before you're ready to get in.
• Replace it as soon as everyone has finished using the hot tub.
• Make sure the cover is properly secured afterwards.
• Avoid leaving the hot tub uncovered unnecessarily.

The less time the water is exposed to cold air, the easier it is to retain heat.

If you regularly entertain guests, making it easy to remove and replace the cover can help you get into the habit of keeping heat loss to a minimum.

6. Maintain Your Hot Tub's Filters and Water Quality

Keeping your hot tub clean isn't just about appearance. Good maintenance also helps the circulation and heating systems operate as intended.

Dirty filters can restrict water flow, potentially affecting circulation and placing additional strain on equipment.

During winter, continue to:

• Clean the filters according to the manufacturer's schedule.
• Check water chemistry regularly.
• Maintain the recommended sanitiser levels.
• Inspect the hot tub for leaks or unusual changes in performance.
• Follow the recommended servicing schedule.

Don't reduce essential filtration or water treatment simply to save energy. Clean water and proper circulation are important for safe, reliable operation.

If your hot tub is taking much longer than usual to heat up, check the manufacturer's troubleshooting guidance or contact a qualified service technician.

7. Consider the Temperature You Actually Need

It can be tempting to turn your hot tub up to its maximum temperature during winter, but a higher setting generally requires more energy to maintain.

Many hot tub owners prefer a setting around 37–38°C, although individual preferences and manufacturer recommendations vary.

You may find that your usual comfortable temperature is sufficient, even on cold evenings.

A few things to remember:

• Follow the manufacturer's recommended temperature range.
• Avoid setting the water hotter than necessary.
• Check the water temperature before entering.
• Be particularly cautious with children and anyone who may be more sensitive to heat.

Pregnant people and those with certain medical conditions should seek appropriate medical advice before using a hot tub.

Making sensible use of your temperature settings can help you stay comfortable without unnecessarily increasing the amount of heat your hot tub needs to maintain.

8. Check Your Energy Settings and Heating Schedule

Some hot tubs offer programmable controls or different operating modes that can help you manage heating and filtration.

Depending on your model, you may be able to adjust heating schedules to suit your routine or use an energy-saving mode.

Before changing any settings, check your owner's manual. Different systems work in different ways, and reducing filtration or circulation beyond the manufacturer's recommendations isn't advisable.

If your electricity tariff offers cheaper rates at certain times, you may also want to investigate whether your hot tub's controls allow you to make sensible use of those periods without compromising water quality or freeze protection.

Remember that the cheapest setting will depend on the individual hot tub and how you use it.

9. Prevent Heat Loss During Water Changes

Occasionally, you'll need to drain and refill your hot tub as part of routine maintenance.

During winter, freshly filled water can take longer to reach your preferred temperature because the incoming water may be very cold.

To make the process easier:

• Choose a suitable day when conditions allow safe maintenance.
• Follow the manufacturer's draining and refilling instructions.
• Check that the hot tub is correctly filled before starting the heating system.
• Allow sufficient time for the water to reach the recommended temperature.
• Never operate pumps or heaters contrary to the manufacturer's instructions.

Avoid draining your hot tub and leaving it empty during freezing weather unless you're carrying out the correct winterisation procedure. Water remaining in the pipes and equipment can freeze even when the main shell is empty.

10. Monitor Your Hot Tub's Running Costs

If you're concerned about your winter electricity bills, keeping track of energy consumption can help you understand how efficiently your hot tub is operating.

Running costs vary depending on the model, insulation, water temperature, usage, outdoor conditions and your electricity tariff.

A simple way to start is to record your electricity meter readings over a period of time and compare them with your usual usage, taking other household electricity consumption into account.

If costs seem unusually high, check for possible causes such as:

• A damaged or poorly fitting cover.
• Deteriorating insulation.
• An exposed or particularly windy installation location.
• Unusual heating or circulation behaviour.
• Water leaks or equipment faults.

If you suspect a technical problem, contact your supplier or a qualified technician rather than attempting electrical repairs yourself.

Frequently Asked Questions

Is it cheaper to leave a hot tub on all winter?

It depends on the model and how frequently you use it. Regular users may find maintaining a consistent temperature convenient, while occasional users may benefit from a lower setting. Always follow the manufacturer's guidance on heating and freeze protection.

What temperature should a hot tub be in winter?

Many owners enjoy temperatures around 37–38°C, but the appropriate setting depends on personal comfort, the model and relevant safety advice. Follow the manufacturer's recommended limits and avoid excessively hot water.

Does a hot tub use more electricity in winter?

It often does because the heating system has to compensate for greater heat loss when outdoor temperatures are lower. Good insulation, a properly fitted cover and a sheltered location can help reduce this effect.

Should I turn my hot tub off when I'm not using it?

Not without checking the manufacturer's instructions. Switching off heating or circulation during freezing weather can put your hot tub at risk of freeze damage. If you intend to stop using it for a prolonged period, follow the correct winterisation procedure.

Can I leave my hot tub outside during freezing weather?

Many hot tubs are designed for outdoor, year-round use, but their suitability depends on the specific model and its installation. Check the manufacturer's minimum operating temperatures and winter guidance, and make sure the hot tub has adequate freeze protection.

Keep Your Hot Tub Warm and Enjoy It All Winter

A hot tub can be a fantastic addition to your garden throughout the colder months. With the right cover, effective insulation, sensible temperature settings and regular maintenance, you can enjoy relaxing in warm water even when the temperature outside drops.

The most important thing is to choose a hot tub that's suited to year-round use and look after it properly.

If you're considering investing in a new hot tub, pay attention to insulation, cover quality, heating efficiency and manufacturer guidance on winter operation. These details can make a real difference to your ownership experience.

Find Your Perfect Hot Tub

Looking for a hot tub you can enjoy throughout the year?

Explore our range of hot tubs and discover models designed to bring comfort, relaxation and enjoyment to your garden in every season.

Browse our hot tubs today and get ready to enjoy your own outdoor retreat this winter.