HEATSTICK: a flameless water-heating system
The 2012 HEATSTICK announcement described an integrated water heater weighing 641 g with its bottle and cover, plus replaceable FuelSticks.
HEATSTICK was introduced as a flameless system for heating water for freeze-dried meals and personal washing in demanding weather. Its patented technology heated the water from inside the container, a design the manufacturer said reduced exposure to wind and weather.
The system was intended to reduce the amount of separate heating equipment carried outdoors and allow water to warm while the user walked. Its total weight was 641 g, including the bottle and neoprene cover.
Because HEATSTICK was integrated into the container, the announcement described using it in different positions, including hanging it up or attaching it to a backpack. The heater occupied 0.1 liters, or 3.40 fluid ounces, of the container’s volume. Its flameless process used gas and oxygen, producing carbon dioxide and water vapor. According to the product description, those by-products remained separate from the water being heated.
An integrated pressure-relief valve was designed to release excess pressure as the temperature rose. The original report did not provide an exact water-heating time.
The system’s approximate price in 2012 was SEK 2,800. A pack of ten FuelSticks cost around SEK 540, with the announcement quoting a heating capacity of 6–9 liters of water per stick.
