What solution is used in electric hot water bottles?

When you charge an electric hot water bottle, you may be wondering: could the liquid inside cause an electric shock problem? When you hold a hot water bottle and use it, you may wonder: Is the liquid inside harmful to the body? This article aims to tell you what the liquid in the electric hot water bottle is and answer your two questions above.

The liquid to put in the electric hot water bottle depends on the condition of the product. Usually, the electric hot water bottle is filled with water. The water inside is not ordinary tap water but processed distilled water or purified water. This is because ordinary tap water may contain some impurities, which may cause the water quality to deteriorate after long-term use, problems such as mildew, yellowing or short circuit caused by impurities occur,

so it needs to be filtered to ensure that there are no impurities in the water before it is suitable as the filling liquid for electric hot water bottles. Some electric hot water bottles require a special liquid, which is usually polyethylene glycol, which is more viscous than water and has good heat conduction properties.

What is the difference between pure water and polyethylene glycol liquid as fillers for electric hot water bottles?

Freeze resistance: In cold environments, purified water has the risk of freezing, which may affect its effectiveness. Polyethylene glycol has a lower freezing point and therefore does not freeze even at low temperatures, making it more suitable in cold environments.

Thermal conductivity: In contrast, the thermal conductivity of pure water is not as good as polyethylene glycol. Under the same conditions, polyethylene glycol can transfer heat faster and reach the same temperature.

Cost: The cost of polyethylene glycol is generally higher relative to purified water.

Safety: When the actual temperature exceeds the set temperature, using polyethylene glycol as a filler for electric hot water bottles may face the risk of chemical reactions, producing substances harmful to the body, but this will not happen with pure water.

Before answering the question "Will the liquid in an electric hot water bottle cause electric shock?", we need to first understand the working principle of an electric hot water bottle: The principle of the hot water bottle is to use an electric heating wire or heating element to generate heat, and then transfer the heat to the filler to increase the temperature of the filler, thereby producing a thermal effect. Both pure water and polyethylene glycol liquids have good thermal conductivity but not electrical conductivity. Even if the electric hot water bottle is damaged during use, the non-conductive filler can reduce the possibility of current leakage，improve user security. The liquid in the electric hot water bottle itself does not cause electric shock problems. However, if the insulation or heating element of an electric hot water bottle is damaged, causing the liquid inside to come into direct contact with the circuit, there is a risk of electric shock. Therefore, in order to ensure safety, when using an electric hot water bottle, you need to regularly check the integrity of the equipment and avoid using a damaged electric hot water bottle.

If the liquid in the electric hot water bottle you buy is pure water, it will not cause harm to the body. If the liquid in the electric hot water bottle you buy is polyethylene glycol, for certain groups of people, such as children, pregnant women, and people with asthma, Patients or people with chemical allergies who use polyethylene glycol as a filler may cause allergic reactions or other discomfort. So if you are not using an electric hot water bottle in a particularly cold place, an electric hot water bottle filled with pure water is the best choice.

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