What temperature of water should go into the hot-water bottle, and how should it be filled? — Warming bag № 2 OLKO

The optimum water temperature for filling a rubber hot-water bottle is no higher than 60–70 °C. Water that is too hot (boiling) creates excess pressure inside the body, speeds up the ageing of the rubber and increases the risk of a burn if it touches the skin by accident. Warm but not scalding water gives a sufficiently long heat effect and is safer to handle.

Filling order:

• Stand the bottle upright and pour in the water slowly — to about two-thirds of its volume, not to the brim: the remaining space is needed for air, otherwise the stopper will be hard to close and the pressure inside will rise.
• Before screwing on the stopper, carefully press out excess air by gently squeezing the body — this will reduce internal pressure.
• Make sure the stopper is screwed on tightly and does not leak.
• Turn the bottle over above the sink and check that it is watertight before placing it on the body or in bed.

After filling, do not place the bottle directly on bare skin: use a thin cloth, a towel or a cover — especially if the skin is sensitive. This reduces the risk of overheating the skin surface during prolonged contact.

A volume of 2 litres allows the bottle to keep warm for longer than smaller models, so there is no need to fill it with the hottest possible water — a moderate temperature will give comfortable warmth for a long time.