Please read all instructions on the heat pack before use.
To activate heat pack:
- Flex metal disc back and forth inside heat pack to activate solution.
- Feel heat pack reach therapeutic temperature within 15 seconds.
- Apply heat pack on desired area. Use fabric pouch if provided to attach heat pack securely and target the heat therapy.
Top tips for activation:
Place on a flat surface or at least make sure there is liquid surrounding the metal disc.
- Place two index fingers under the dome of the metal disc and press the top with your thumb to click it.
- Don’t bend the disc – you are trying to click it inside-out, not snap it in half.
- If nothing happens, try clicking the disk again!
To reset heat pack:
- Heat water until boiling in a pan or rice cooker.
- Place the heat pack in the Boiling Bag or on a cloth in the boiling water. Keep boiling until ALL CRYSTALS dissolve, around 5 minutes if the water is boiling hot and bubbling.
- Let the heat pack cool to room temperature before using. If it crystallises on cooling, then boil it again.
If you are having difficulty resetting your heat pack, please have a look at our FAQ for more ideas there.
More Information about Kwikheat Warmers
How Heat Packs Generate Heat (quick version)
- The liquid inside is a very concentrated salt solution
- It’s safe to eat but doesn’t taste very nice
- Tiny little crystals form in the holes in the metal disc
- When you click the disc, these crystals are pushed into the liquid
- The crystals make all the salt molecules in the liquid join together, releasing heat energy
- Melting the crystals in boiling water turns them into liquid again and puts the energy back into the heatpack, ready for use
How Heat Packs Generate Heat (more sciencey version)
- Water is a liquid above 0oC and becomes a solid (ice) below 0oC
- The salt solution used in heat packs is a liquid above 54oC and crystalises to become a solid below 54oC
- However, the solution is very stable as a liquid and can be ‘supercooled’ easily as a liquid so that it remains a liquid at room temperature (around 25oC), just like in a Kwikheat Warmer ready to be used
- Tiny crystals of solid salt form in microscopic cracks on the surface of the metal disc inside the heat pack
- When the disk is flexed these crystals are pushed out into the liquid
- The crystals act as ‘nucleation centres’, causing all the surrounding salt molecules in liquid form to join the crystal lattice until everything has solidified
- The process of crystalisation releases heat, raising the temperature of the salt to 54oC a.k.a its boiling point
- Placing the heat pack in boiling water melts the salt crystals into liquid form again – as long as all the crystals have dissolved, the liquid will be stable again