As summer temperatures rise across the UK, staying cool at night can be a challenge. While fans and air conditioning units are common solutions, they primarily circulate air rather than directly cool the body. However, an unexpected household item—a hot water bottle—can provide effective relief.
How a Hot Water Bottle Cools You Down
John Lawless from BestHeating explains that hot water bottles are excellent insulators, capable of retaining either hot or cold temperatures. By filling a hot water bottle with cold water or ice cubes, it draws heat away from your body through natural heat transfer. This process lowers your temperature quickly and makes your bed feel cooler and less sticky.
“Hot water bottles are great insulators. This means that they can stay either hot or cold when you need it whatever time of year!” Lawless said. “A good tip to keep your bed cool at night is to put your 'cold' water bottle under the sheets or next to your pillow in the evening. That means when you eventually get into bed it will be lovely and cool not hot and sticky.”
Step-by-Step Guide to Using a Hot Water Bottle for Cooling
To use this hack, simply fill a hot water bottle with ice cubes, crushed ice, or chilled water from the fridge. Remove any cover before filling. For faster cooling, place the bottle against pulse points such as your neck, wrists, or ankles. Overnight, position it at the foot of your bed or near your pillow. If the bottle feels too cold, wrap it in a towel or pillowcase.
While some people briefly freeze the bottle, experts caution against leaving it in the freezer for more than 20 minutes, as water expansion can cause leaks or cracks. Never fill a hot water bottle with frozen water.
Benefits Over Fans and AC
Unlike fans, which simply move air, a cold hot water bottle directly absorbs body heat, providing immediate cooling. It is also energy-efficient and inexpensive, making it a practical alternative during heatwaves.
