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HotRox Electronic Hand Warmer review: can this slimline device help you beat the chill?

A two-sided hand warmer that also doubles up as a power bank, this clever gadget claims to keep your hands warm for three to six hours, but does it live up to expectations? MNHQ writer Lucy put the HotRox Electronic Hand Warmer to the test.

By Lucy Cotterill | Last updated Feb 14, 2024

Our rating:

Price on writing: £27 | Buy now from Amazon

If daily school runs, winter walks, or conditions such as Raynaud’s syndrome leave your fingers feeling icy cold, investing in one of the best hand warmers can be a great solution. Providing some comforting warmth for your hands both inside and outside the home, they can either be held between your palms or slotted into your gloves or coat pocket for a welcome boost of heat.

While disposable options such as Hot Hands can provide long-lasting relief, a rechargeable hand warmer is a much more sensible choice if you’re likely to use it regularly, offering the best value for money on a cost-per-use basis. 

The HotRox Rechargeable Hand Warmer comes well regarded by Mumsnet users, while Amazon reviewers praise its ease of use, choice of temperature settings and power bank capabilities. Is it worth the £27 investment, however? I put it to the test to find out. Using it for a week inside my house and outdoors, I scrutinised the HotRox, paying careful attention to its heat levels, battery life, ease of use, and overall value for money. Here’s my full verdict. 

Feeling the chill? We also have guides to the best electric blanket, cosiest women’s slippers, and warmest hot water bottle, as recommended by Mumsnetters.

What we like
  • Ergonomic pebble shape 

  • Heats up on both sides 

  • Rechargeable for long-term use 

  • Doubles up as a power bank for charging phones/tablets (cable required)

  • Generates three to six hours of heat (depending on setting)

  • Choice of two heat settings - 45 and 60 degrees 

  • Heats up in less than 15 seconds 

  • Can turn off once your hands feel warm enough

  • Lights advise how much charge is remaining 

  • No boiling or fuelling required 

What we don't like
  • Can take up to four hours to fully recharge when the battery is drained 

  • The USB cable doesn’t come with a plug

  • Need a charging cable with you to use as a power bank outside the home 

  • Heat doesn't last as long as some other options

Our verdict

HotRox Rechargeable Hand Warmer out of the box
  • Warmth: 4.5/5 

  • Longevity: 4/5 

  • Ease of use: 4.5/5 

  • Value for money: 4/5 

While it’s more expensive than some hand warmers, the smooth pebble-shaped HotRox Hand Warmer is a really effective reusable option. I loved the choice of two temperature settings and the double-sided heat, which provided impressive warmth that lasted just over three hours on the highest setting (and five-and-a-half hours on the lowest). 

While it’s slimline and ergonomically shaped, it’s a little bulkier than some, so I felt it was more suited to winter coat pockets than using inside gloves. On the plus side, it also doubles up as a power bank – allowing you to instantly charge your battery if it starts to run low during your travels. 

What is the HotRox Electronic Hand Warmer?

Originally made to support those with Raynaud’s syndrome, the HotRox is an ergonomic pebble-shaped hand warmer that is designed to sit comfortably in the palm of your hand. It also comes with a coveted seal of approval from the Raynauds' Association.

Heating up in just 15 seconds, this portable hand warmer generates double-sided heat in a choice of two temperatures – 45 and 50 degrees celsius – lasting between three and six hours depending on your setting. 

Related: Best draught excluder for keeping the cold out

How easy is the HotRox Electronic Hand Warmer to use?

HotRox Electronic Hand Warmer being used as a power bank

I found the HotRox Hand Warmer very intuitive to use – the text and visual instructions were really easy to follow, with flashing lights on the hand warmer to help me visually differentiate between the settings.

It came almost fully charged, but I plugged it in using the USB cable included before my first use. Like most electronics these days, the HotRox doesn’t come with its own plug. However, it's compatible with any standard USB plug socket, or it can be charged via your laptop or PC. You can also buy a HotRox Mains Charger as an accessory, although in most cases I don’t think that would be necessary. 

Once fully charged, I was able to simply press and hold the power button to turn it on (holding down for around four seconds). The temperature starts on the lowest setting by default, with the red power light pulsing slowly. To switch to the higher temperature, I pressed the power button again, which resulted in the red light flashing more rapidly to show the HotRox was on high heat. I found it very straightforward to switch between the temperature modes as required. 

HotRox Rechargeable Hand Warmer in a pair of fingerless gloves

I love the pebble shape of the HotRox which moulds nicely in your hands, but it is quite large compared to disposable options like Hot Hands. While it did fit inside my more stretchy fingerless gloves, it wasn’t discreet and was quite bulky, therefore I feel it is better suited to stashing inside your pocket or simply cupping between your hands. 

When the HotRox is turned off, it can also be used as a portable power bank, which is ideal if your car breaks down or your phone battery dies when you're out and about. I loved this additional feature, although it's worth noting you would still need to have a phone charging cable with you, as it doesn’t offer wireless charging. 

When the battery was completely drained, the HotRox took around four hours to fully recharge, but I didn't find this particularly onerous and loved that it could be used daily without the need to boil or refuel the hand warmer. 

Related: The best thermal socks for tackling cold feet

How warm is the HotRox Electronic Hand Warmer?

HotRox Electronic Hand Warmer

The HotRox Hand Warmer heats up very quickly, with the heat noticeable from around 15 seconds after activation. The default setting is 45 degrees, which I found perfect for my needs, and it felt like I had my hands wrapped around a freshly served mug of coffee.

The 50-degree setting felt a little too hot for me personally, but it may be useful on days with more extreme weather or when you’re spending significant periods outside during winter and don’t want to shell out for an expensive pair of heated gloves

Related: Best heated throw for keeping warm at home

How long does the HotRox Electronic Hand Warmer stay hot?

The brand claims that this hand warmer can stay hot for between three and six hours depending on the setting, and my experience mirrored this.

On the highest setting, the heat lasted just over the three-hour mark before the battery depleted, whereas, on the lowest setting, it was just over five-and-a-half hours before the battery drained.

Blue lights on the HotRox pebble showed me how much battery life was remaining at all times too, with three lights showing when the hand warmer was fully charged and one light indicating the battery was running low. 

What I particularly liked about HotRox is that you have the option to turn it on and off throughout the day to preserve the battery life, ensuring you have power available to provide heat when you need it the most.

Related: The best heated gilet, tried and tested

Price: is the HotRox Electronic Hand Warmer worth it?

HotRox Electronic Hand Warmer in use outdoors

At the time of writing, the HotRox Electronic Hand Warmer retails at £27, which may seem like a large initial investment, but it can be used repeatedly for the foreseeable future. When you consider the overall cost per use, therefore, it works out as a more affordable choice than disposable options. 

For its reusable design, convenient recharging and power bank functionality alone, I feel it offers good value for money and can keep your hands warm for an adequate amount of time. If you’re looking for an all-day solution, however, it doesn’t generate heat for as long as the Ocoopa or Zippo 12-Hour Hand Warmer, which both retail at a similar price point.

How we tested

Selection of the hand warmers we tested

I tested the Hotrox Electronic Hand Warmer in my home town of Birmingham during a chilly week at the beginning of February. As part of my testing, I evaluated HotRox for its warmth, battery life, ease and use and overall value for money.

  • Tested across a week in early February 

  • Used both inside the home and during the daily school run or daily exercise outdoors 

  • Cross-compared with other hand warmers I've tested

About the author

Lucy Cotterill is a mum of two and a Content Writer at Mumsnet, specialising in lifestyle product reviews and round-ups. Having written product reviews on her own blog Real Mum Reviews since 2012, Lucy loves to research and explore the pros and cons of products, scrutinising expert advice and consumer feedback to help people make informed purchase decisions.  

Working from home four times a week in a garden office and doing two daily school runs on foot, Lucy has plenty of tried-and-tested tips on how to stay warm in winter. As well as putting a variety of hand warmers through their paces, she’s also spent significant time researching the top ways to keep cosy in winter - from wearing the best blanket hoodies to investing in some of the cosiest thermal underwear, trapping in body heat to keep you toasty warm without increasing your energy bills. 

Originally from a HR background with a degree in Business Studies, Lucy developed a real passion for blogging and writing when her children were young, going on to write for several online publications including US parenting site Pregistry and the Evening Standard. When she’s not manically tapping the keys of her laptop, Lucy loves nothing more than to cosy up with her Kindle and enjoy the latest thriller, head for a swim at the local gym or compete in Nintendo Switch rallies with her daughters aged six and 10.

About Mumsnet Reviews

All Mumsnet product reviews are written by real people after weeks of research and testing. We work hard to provide honest and independent advice you can trust. Sometimes, we earn revenue through affiliate (click-to-buy) links in our articles. However, we never allow this to influence our coverage.

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