Towel warmers for hot tubs and how to choose one

The safest towel warmer for hot tub use is one rated for the place you put it, plugged into an RCD-protected outdoor socket and kept well out of reach of the water. After that, choose between a bucket, a cabinet or a rail based on how many towels you warm and where the warmer will live.

This guide covers the outdoor safety checks first: IP rating, RCD protection and distance from the water. Then it compares the three main types, explains which features matter and shows you how to work out running costs from the wattage on the label.

Is a towel warmer safe to use next to a hot tub?

It can be, but most towel warmers are designed as indoor appliances. A heating element and a mains cable in a garden with splashing water need more care than they do in a bathroom. Three checks matter more than anything else: the IP rating, RCD protection and how far the warmer sits from the water.

Electrical work near water has specific rules. In the UK, fixed wiring must follow BS 7671, the national wiring regulations, and new outdoor sockets or circuits should be fitted by a registered electrician. Other countries have their own standards, so if you live outside the UK, follow your national rules and ask a local qualified electrician.

What IP rating does a towel warmer need outdoors?

An IP (ingress protection) rating has two digits. The first shows protection against solids such as dust, from 0 to 6. The second shows protection against water, from 0 to 9. An X in place of a digit means that part was not tested.

• No rating or IPX0: no protection against water. Treat it as indoor use only.
• IPX4 or IP44: protected against splashing water from any direction. This is the minimum worth considering for a covered outdoor spot.
• IPX5 or IP65: protected against water jets, such as from a garden hose. Better for a more exposed position.
• IP66 or higher: protected against powerful jets. You usually see this on outdoor sockets and fixed fittings rather than towel warmers.

Many towel warmer buckets and cabinets carry no IP rating at all, because they are made for bathrooms. If the box or manual does not state that the warmer is suitable for outdoor use, treat it as an indoor product. A splash rating also does not mean an appliance can be left out in the rain.

Why does the socket need RCD protection?

An RCD (residual current device) monitors the current in a circuit and switches it off in a fraction of a second if some of it leaks to earth, for example through water or a person. In the UK, BS 7671 requires outdoor sockets to have 30 mA RCD protection, the level designed to reduce the risk of a fatal electric shock.

Your hot tub should have its own RCD protection, but the socket you use for the towel warmer may be on a different circuit. Check which RCD covers that socket in your consumer unit, and press its test button every few months. Our guide to hot tub RCD protection explains how to test it and what to do if it trips.

A plug-in RCD adaptor adds protection at the socket and is useful as a backup, but it does not replace a properly protected circuit. If your outdoor socket has no RCD, ask a registered electrician to check it before you use any appliance there. The charity Electrical Safety First has clear advice on RCDs and outdoor electrics.

How far from the water should a towel warmer be?

Many UK electricians use the zones in BS 7671 Section 702, which was written for pools and basins, as a guide around hot tubs. Under those zones, the area within 2 m (about 6.5 ft) of the water's edge has strict limits on electrical equipment, and socket outlets are generally not allowed within 3.5 m (about 11.5 ft). Electricians and hot tub makers differ on exactly how these rules apply to a hot tub, so check your manual.

For a plug-in towel warmer, a simple rule works well: nobody sitting in the water or standing on the hot tub steps should be able to reach it. Keep the warmer at least 2 m from the edge and out of splash range, and plug it into a socket that is further away again.

Never touch a towel warmer, its plug or its switch with wet hands or while you are standing in water. Dry your hands on a towel first, or ask someone who is dry to bring you the warm towel.

Heated cabinets, buckets and rails: what is the difference?

Hot tub owners mainly use three types of towel warmer. They work in different ways and suit different set-ups, so decide where the warmer will live before you compare features.

Towel warmer buckets

A bucket is a lidded container with heating elements in its walls. You roll or fold the towels inside, close the lid and wait. The lid traps the heat, so the towels come out evenly warm all the way through.

Buckets are portable and most have a timer and an automatic shut-off. Capacity is given in litres, often between about 20 and 40 litres (about 5 to 10 US gallons). How many towels fit depends on their size and thickness, so use the guide below as a starting point.

• 20 litres: typically one or two large bath sheets of about 100 x 180 cm (about 39 x 71 in). It struggles to take a thick robe as well.
• 35-38 litres: about four to six towels, or a robe plus two towels.

Towel size makes a big difference. A standard 20 litre bucket can take about five medium-sized bath towels instead of two large bath sheets. If you switch to smaller towels, one bucket can serve more people in a single session.

Besides towels, most buckets can also warm robes, pyjamas, socks and small blankets, as long as the fabric is heat-resistant. This is handy for getting dressed in something warm after a winter soak. Check the manual for which fabrics the maker allows.

Some buckets fold flat, which helps if you bring the warmer indoors between sessions. Folded, some pack down to roughly 40 x 29 x 17 cm (about 16 x 11 x 7 in), small enough for a deck box or a cupboard. Check the handle and the cable: you want a handle you can carry safely when the bucket is full, and a cable that reaches the socket without stretching.

Soft-sided foldable buckets are less rigid than hard-shell models. They need a firm, level surface to stay upright, and they suit occasional use with storage in between better than permanent use in one spot.

Some foldable buckets have a wipe-clean, water-resistant fabric outer that copes better with damp air. This does not make them waterproof or splash-rated. Only a stated IP rating tells you how well the warmer resists water.

Some buckets also have a separate drying mode that runs for about 2 to 5 hours, sometimes with hooks inside to hang towels. Only put damp towels in a model the manufacturer says is designed for this. Standard warming modes are usually for dry towels only.

Heated towel cabinets

A cabinet is an insulated box with a door and one or more shelves. It heats a larger space, so it can warm several towels and robes at once. Cabinets are common in spas and salons, and some home models are freestanding with a standard plug.

Some heated towel cabinets include UV sanitising, which is one reason they are common in professional spas. At home it is an optional extra, so check the manual for how the UV lamp works and how often it needs replacing.

Cabinets suit a hot tub next to a garden room, pool house or summerhouse, where the cabinet can stay in one dry place. They are usually too heavy to carry in and out each time. If yours will stand under a gazebo rather than inside a building, check its outdoor rating carefully.

Heated towel rails

A heated towel rail is the type most people know from bathrooms. Electric rails come as hard-wired fixed units or freestanding plug-in units. They are good at drying damp towels and keeping hung towels warm, but a cold, folded towel takes a long time to warm on a rail.

A rail makes most sense in a garden room or changing area next to the hot tub. Fitting a hard-wired rail is fixed electrical work. In England and Wales it may be notifiable under Part P of the Building Regulations, especially near water, so use a registered electrician who can certify the work.

How to choose a towel warmer for hot tub use

Once you know which type suits your space, compare models on the points below. You want a warmer that is safe where you will use it, holds enough for your household and is easy to use every week.

Capacity: how big should it be?

As a rule of thumb, a 20 litre bucket suits one bather. If two or more people in your household use the hot tub together, look at 35 litres or more so everyone has a warm towel at the same time.

Usable space varies between buckets with the same litre rating, because wall thickness and shape differ. Check that the maker says the warmer fits your actual towel size, such as a 100 x 180 cm bath sheet, rather than relying on litres alone.

Some larger buckets have a removable internal divider that keeps robes and towels separate. This helps smaller items warm evenly and makes them easier to lift out. Take the divider out when you want to warm one bulky item instead.

How evenly does it heat?

For the most even warmth, look for a bucket that heats from the base as well as the walls, or one with an element wrapped all the way round the inside. With elements in the walls only, towels touching the sides warm first and those at the bottom and in the centre can stay cooler.

Wattage and warm-up time

Wattage affects how quickly a warmer heats up. A lower-wattage model, for example 400 W rather than 450 W, may take a little longer to warm through, or leave the towels slightly less warm after the same run time. Compare the wattage alongside the warm-up time the maker states, rather than looking at either figure alone.

Safety features to check

• Outdoor suitability: a stated IP rating and clear instructions for outdoor or covered outdoor use. If the manual says indoor use only, follow it.
• Safety marks: UKCA or CE marking, and a seller you can identify and contact. Be cautious with very cheap unbranded electrical goods.
• Independent testing: UKCA and CE marks are self-declared by the maker. A mark from a recognised testing lab, such as BEAB in the UK, shows the product has also been tested independently.
• Timer and automatic shut-off: these stop the warmer running all night if someone forgets to switch it off.
• Overheat protection: a thermal cut-out that switches the element off if it gets too hot.
• PTC heating elements: some buckets use PTC (positive temperature coefficient) elements, which limit their own temperature as they warm up. This adds a layer of protection against overheating.
• Fire-resistant casing: check that the outer casing is made from fire-resistant or flame-retardant plastic, because the appliance holds hot fabric for long periods.
• Tip-over protection: a switch that cuts the power if the bucket is knocked over or tilted past about 45 degrees. This matters on decking and patios, where a bucket is easy to knock.
• Child lock: locks the controls so children cannot switch the warmer on or change the settings by accident.
• Stable build: a wide base that will not tip over on a patio, and handles that stay cool enough to carry.
• Cable and plug: long enough to reach the socket without an extension lead, with a standard UK three-pin plug.

Controls and everyday use

• Adjustable timer: several options, such as 20, 30, 60 or 90 minutes, are more useful than a single fixed cycle. Check that the longest setting covers your usual soak, or you will need to restart it.
• Delay start or preset mode: some warmers switch on at a time you choose, so the towels are warm when you get out without you touching the controls. On some models you can set this anywhere from about 30 minutes to 24 hours ahead.
• Keep-warm mode: some buckets hold the towels at temperature for up to about 4 hours after the first warm-up. This helps when people get out of the hot tub at different times.
• Ready alert: some warmers sound a buzzer when the towels are ready. This is useful because you cannot see the display from inside the hot tub.
• Digital display: some models show the set temperature and the time remaining, so you can check the cycle at a glance.
• Temperature settings: some models have one setting, others two or more. Adjustable buckets often run from about 70°C to 100°C (about 158°F to 212°F). The lower end suits thinner towels and uses less energy, and the higher end suits thick robes on cold nights.
• Matching the setting to the fabric: use the lowest setting, around 70°C, for delicate items such as thin towels or children's and baby clothes. Save the highest setting for thick robes and blankets.
• Quiet running: check owner reviews for comments about noise. A warmer that hums or clicks can spoil a calm evening soak in a quiet garden.
• Lid or door seal: a good seal keeps the heat in on a cold, windy evening.
• Easy cleaning: a lid and bucket that separate, and ideally a stainless-steel lining, which is easier to wipe clean than plastic.

Newer models with only a few reviews give you less evidence of how reliable they are over several years. Read owner reviews before you buy, and look for comments about the timer, the lid and the heating elements after months of use.

Fragrance trays, decorative finishes and remote controls are a matter of personal taste. They do not make a warmer safer or more effective, so do not pay extra for them at the expense of the points above.

If you are planning other equipment at the same time, our guide to hot tub accessories worth buying covers which items are useful and which tend to go unused.

How much does a towel warmer cost to buy and run?

Buying price

As a rough guide, and prices change, plug-in towel warmer buckets usually cost from about £40 to £150. Freestanding plug-in rails are often cheaper. Heated cabinets usually start higher and can cost several hundred pounds.

A higher price does not always mean better safety. Check the IP rating, the safety marks and the length of the warranty before you compare looks or extra features.

Many towel warmer buckets come with a 12-month warranty. A shorter warranty on an electrical appliance that heats up next to water is a warning sign, so look elsewhere if the cover is less than a year.

Running costs

The running cost depends on three things: the wattage on the rating plate, how long the warmer runs and the unit price of electricity on your bill. You can work it out the same way as for any electrical appliance.

1. Find the wattage on the rating plate or in the manual, for example 500 W.
2. Divide by 1,000 to get kilowatts. 500 W is 0.5 kW.
3. Multiply by the hours it runs. 0.5 kW for 30 minutes is 0.25 kWh.
4. Multiply by your unit rate in pence per kWh, which is shown on your electricity bill.

Using an example rate of 25p per kWh, that 500 W warmer running for 30 minutes would cost about 6p per session. The real figure is often lower, because the thermostat switches the element on and off once it reaches temperature. Your own rate may be higher or lower, so use the figure on your bill.

Typical 20 litre bucket warmers are rated at about 400-450 W, and larger buckets generally use more energy. If you only warm one or two towels, a smaller bucket is the more efficient choice, because you are not heating empty space.

Rails usually have a lower wattage but often run for many hours at a time. Over a week, a rail left on all day can cost more than a bucket used for half an hour per session. A rail with a built-in timer helps you run it only when you need it.

Compared with heating the hot tub itself, a towel warmer is a small cost. If you want to reduce your energy bills, keeping heat in the water makes a much bigger difference, so read whether hot tub thermal blankets save energy.

Where should you put a towel warmer by a hot tub?

Good placement keeps the warmer dry, stable and out of the way. Plan the spot before you buy, because the position decides which type and IP rating you need.

• Under a roof: a gazebo, a pergola with a solid roof, a covered porch or a garden room, where rain cannot fall on it.
• Out of splash range: further from the hot tub than water can reach when people get in and out.
• On a flat, solid surface: a level patio slab or a sturdy outdoor table, not grass or an uneven surface.
• Close to a suitable socket: so the cable reaches without stretching and without an extension lead.
• Weatherproof socket cover: use an outdoor socket with an in-use cover that stays closed while the plug is in, so rain and splashes cannot reach the connection during a session.
• Away from walkways: route the cable where nobody can trip over it in the dark.
• Away from other heat sources: keep it clear of patio heaters, fire pits and barbecues.

Typical bucket warmers come with a power cable of about 1.8 m (6 ft). Measure the distance from your chosen spot to the socket before you buy, and remember the warmer still needs to sit well away from the water.

Check the dimensions before you buy. Larger buckets can stand about 50-55 cm (about 20-22 in) tall and take up a lot of space on a small patio. Slim upright designs need less floor area if space is tight.

Typical buckets also have a footprint of roughly 30-35 cm (about 12-14 in) across. When you plan the spot, allow at least that much flat surface as well as the 50-55 cm height, so the bucket sits fully on the table or slab without overhanging the edge.

Steps and wet decking are common places to slip around a hot tub. Keep the warmer and its cable away from the route between the hot tub steps and the house, and read our guide to safe hot tub steps if your access feels unsteady.

A roof or screen near the hot tub also gives you a dry place for the warmer. Our hot tub privacy ideas for UK gardens include covered options that work well for this.

Can you use an extension lead?

Avoid extension leads if you can. If you have no choice, use one made for outdoor use with a weatherproof connector, unwind it fully so it does not overheat, and keep the connection off the ground and out of the rain. A permanent outdoor socket fitted by a registered electrician is the better long-term solution.

Can you use an indoor towel warmer outside?

You can use an indoor towel warmer for your hot tub, but in most cases it should stay indoors. Warm the towels in the kitchen or utility room, then carry them out in a closed bag or basket. They lose some heat on the way, but this is the safest option if your warmer has no outdoor rating.

Taking an indoor-only warmer outside, even under cover, exposes it to damp air, condensation and splashes it was not designed for. Moisture inside the casing can damage the controls or create a risk of electric shock. If you want the warmer next to the hot tub, choose one the manufacturer says is suitable for outdoor or covered outdoor use.

Cold weather matters too. Some manuals give a minimum operating temperature, and condensation can form when a cold appliance is brought into a warm room. Let the warmer reach room temperature and dry completely before you plug it in again.

How do you use a towel warmer safely each time?

Timing matters as well as safety. If your warmer takes 20 to 30 minutes to heat through, switch it on about 15 to 20 minutes before you get into the hot tub rather than as you step in. That way the towels are fully warm even after a short soak.

1. Check the cable, plug and casing for damage before each use. Do not use the warmer if anything is cracked, scorched or wet.
2. Place it on a flat, dry surface under cover and well away from the water.
3. Check the fabric. Many manufacturers say to warm only cotton or other heat-resistant fabrics, and not synthetic-fibre towels or garments.
4. With dry hands, plug it into an RCD-protected socket and switch on at the socket.
5. Load dry towels without overfilling, then close the lid or door.
6. Set the timer so the warmer switches off by itself.
7. When you get out of the hot tub, dry your hands on a spare towel before you open the warmer, or ask someone who is dry to fetch the towels.
8. Switch off at the socket, unplug and let the warmer cool before you move or store it.

Many warmers have a hot-surface indicator light that shows when the inside is too hot to touch. Do not reach into the bucket while it is lit. Lift the towels out by their top layer, or wait until the light goes off.

Keep children and pets away from the warmer while it is on. The inside and some outer surfaces get hot, and a bucket can tip over if someone pulls the cable.

How do you clean a towel warmer?

1. Switch off at the socket, unplug the warmer and let it cool completely.
2. Lift off the lid, if your model has a lid that separates from the bucket.
3. Wipe the inside with a damp, well wrung-out cloth. Do not pour water into the warmer or put it under a tap.
4. Leave the lid off until the inside is fully dry before you store it or plug it in again.

A stainless-steel lining is easier to wipe clean than plastic and is less likely to hold marks or smells. Follow the manual for any cleaning products, because some can damage the lining or the seals.

What mistakes should you avoid?

• Buying an indoor-only warmer and leaving it next to the hot tub.
• Plugging the warmer into a socket that has no RCD protection.
• Joining several extension leads, or using an indoor multi-socket adaptor outside.
• Packing in more towels than the manufacturer allows, which blocks airflow and can overheat the element.
• Leaving the warmer out in the rain or in the garden overnight.
• Putting wet towels in a warmer designed only for dry ones.
• Covering the vents, or placing the warmer against a fence panel or soft furnishings.
• Choosing on looks or extra features instead of safety rating and capacity.

Summary

Start with safety. Choose a warmer with an outdoor or covered outdoor rating, plug it into a socket with 30 mA RCD protection and place it well out of reach of anyone in the water. In the UK, any new outdoor socket or fixed wiring should be fitted by a registered electrician to BS 7671.

Then choose the type. A bucket suits most couples and small families, a cabinet suits a garden room with several users, and a rail is best for drying towels rather than warming them quickly. Work out running costs from the wattage and your unit rate. For a bucket used for half an hour, the cost per session is usually a few pence.

Frequently asked questions

How long does a towel warmer take to warm hot tub towels?

Many bucket warmers are designed to warm towels in roughly 10 to 30 minutes, depending on wattage, towel thickness and how cold the air is. Some advertise that the element feels warm within about a minute and reaches full temperature in about 3 to 10 minutes, while others take about 25 minutes. Cabinets can take longer. Compare the stated warm-up time with how long you usually soak, and check your manual for the manufacturer's guidance.

How can I warm towels without a towel warmer?

Put dry towels in a tumble dryer for a few minutes just before you go outside, then carry them in a closed bag or an insulated cool box so they stay warm for longer. An airing cupboard or an indoor radiator also works. Never put towels on a patio heater, near a fire pit or on any heater not designed for drying textiles, as this is a fire risk.

Can I make a simple DIY towel warmer for my hot tub?

Yes, for short soaks. Put a filled hot water bottle or some reusable heat packs in the bottom of an insulated cool box or a deck box, then lay the folded towels on top and close the lid. It needs no electricity near the water. It loses heat quickly in cold weather, so it works best for sessions of half an hour or so.

Can I leave a towel warmer outside all year?

Only if the manufacturer says it is designed for permanent outdoor use, and few freestanding warmers are. Rain, frost and condensation can damage the controls and wiring over time. For most people, the better routine is to store the warmer indoors or in a dry shed, and bring it out to a covered spot only when you use the hot tub.

Can I put damp towels in a towel warmer?

Check your manual first, because manufacturers differ. Many buckets and cabinets are designed for dry towels only, and moisture can affect the heating elements and encourage mildew. A heated rail is the better choice for drying damp towels after use. If your warmer does allow damp towels, empty it afterwards and leave the lid or door open so the inside can dry.

Do I need an electrician to install a towel warmer by my hot tub?

Not for a plug-in bucket or cabinet, as long as you already have a suitable outdoor socket with RCD protection. You do need a registered electrician for a new outdoor socket, a new circuit or a hard-wired heated rail. In England and Wales, much of this work falls under Part P and the electrician can certify it. Scotland, Northern Ireland and other countries have their own rules.

Are fragrance trays in towel warmers safe to use?

Fragrance features come in two forms: an external tray that scents the surrounding air, and an inner pad holder that scents the towels themselves. Towels scented from the inside are more likely to carry fragrance into the hot tub water if they touch it, and oils and perfumes can cause foaming and cloudy water. Use only products the manufacturer recommends. If skin becomes itchy or irritated, stop using the fragrance and speak to a pharmacist if it does not settle.