The HOT PACK® heater does not rely on oxygen in its heat process. The Magnesium & Sodium Chloride mixture works at any altitude once water has been added.
No! In October 1997, a climber from Vancouver, British Columbia activated the heater at 25,350 feet on Mount Everest. He was delighted to note that it was not affected by the elements. As you are aware, it is extremely difficult to light a fire or stove at high altitudes because oxygen is required. This is not so for the heater. Sadly, the team had to return to base camp because the weather was ferocious. No one made it to the top!
Make sure the heater is placed UNDER the meal before activating with water. If the heater is on top of the meal, the water will not make contact with the heater and therefore no heat will be generated. Equally, if during meal insertion, the heater has been bunched up at the bottom of the sleeve, it will not work as efficiently. MAKE SURE THE HEATER STAYS FLAT UNDER THE WHOLE MEAL. It is also possible that the heater and meal inside the sleeve were not kept reasonably flat initially (first 30 seconds). The heater needs to absorb the water through each membrane and heater element to obtain maximum efficiency.
A trace amount mixed with steam. An hypothetical situation: “There are 15 men inside the cabin of a fire truck. It is winter and the doors are shut to keep in the heat. How many heaters can be activated at one time? Make sure there is plenty of ventilation. By doing this, there is no problem in activating 15 meals (one for each of the men). Always activate the heaters in a ventilated area.
The smell is magnesium being activated and is in no way toxic. All the ingredients in the heaters are FDA food grade standard.
The main consideration is not the size of the space but ventilation. A minute amount of hydrogen is given off. This displaces oxygen. That is why we say “Activate the heater in a well-ventilated area”. There are, however, no toxic fumes.
No. The heaters are in a sealed sleeve. However, the heater sleeves should be kept away from any contact with water. If the sleeve is damaged then you must activate the heater with water and dispose of the heater/heater sleeve. Care must be taken because of the steam and heat being generated when the heater is activated. If you open the heater sleeve and decide not to use it immediately, humidity can get in and the heater might not function to its full capacity. It is considered inadvisable to open the sealed sleeve and not use it immediately.
The heater is not affected by temperature.
The heaters should be kept in an area that is dry and away from open flames. The temperature of the room is not important.
No! Not to our knowledge.