This remarkable revolution in camping culture began in 2004. While David Cho who is a machine designer and an inventor of BLACKCAN was climbing the Annapurna in extreme cold, he keenly felt the necessity of the outdoor heating system which can make outdoor camping safe and comfortable. During those processes, " pumpless circulation system" which circulates water without pump and "High efficiency combustion system" which controls flames automatically by set temperature were developed by David Cho. We obtained CE mark because numerous field tests in the worst conditions can guarantee the safety of BLACKCAN. So this product is ready for you. Now you will have an interesting and new experience with BLACKCAN in your mountain climbing. You can find out more details on youtube.http://www.youtube.com/watch?v=L6H30rfSakg