Yutanpo hot water bottle – User manual & care instructions

The metal hot water bottle Yutanpo is an iconic Japanese everyday object, appreciated for its gentle, long-lasting, and natural warmth. To ensure safe use and prolong its lifespan, it is important to follow these recommendations.

1. Usage

  • Heat the water to approximately 80–90 °C (the water should not be boiling).

  • Once the water is hot, wait 1 to 2 minutes before pouring it into the hot water bottle.

  • Then, carefully fill the hot water bottle.

  • Wait another 1 to 2 minutes before closing it with the stopper, to limit thermal shocks.

  • Carefully close the stopper.

  • Always use the hot water bottle with a cover or textile protection to avoid any direct contact with the skin.

    2. Natural corrosion phenomenon

  • Metal hot water bottles may, after prolonged use, develop corrosion inside.


    • Over time: - slight metal particles may detach, - in rare cases, this corrosion can lead to the formation of micro-perforations.

    👉 Sign to watch out for : If the water flowing from the hot water bottle becomes brownish, this indicates the beginning of a rusting phenomenon. In this case, use should be done with caution.


    3. Essential good practices

    To limit the appearance and progression of rust, the manufacturer recommends:

    • Systematically empty all water after each use
    •     Remove the stopper and allow the inside to dry completely
    • Ideally, let the hot water bottle     air dry or sun dry
    • Never store the hot water bottle when it is still damp inside

    Stagnant moisture greatly accelerates corrosion.

    4. Storage
    • Store the hot water bottle open, without the stopper, in a dry place.

    • Avoid keeping water inside for a long period, even off-season.

5. Lifespan & maintenance

Depending on the conditions of use and maintenance, a Yutanpo hot water bottle can last for many years. Careful maintenance is key to preserving its thermal qualities and safety.

6. In summary

✔ Empty after each use
✔ Dry the inside completely
✔ Store dry, with stopper removed
✔ Monitor for any brownish discoloration of the water

By following these tips, you will fully enjoy your Yutanpo hot water bottle with complete peace of mind. For any further questions, our customer service remains at your disposal.