. >> it's the brainchild of scottish plumber and heating engineer, david osborne, who grew up in south africa and has retained a strong affinity to the continent. he built the prototype in his garage. >> i had an idea at 11:00 at night. lying in bed, i had the idea. i drew it, and the following morning at 6:00 a.m., before anyone put their washing out, i lit a fire in my driveway. i put a length of copper tubing into the fire and ran water through it, to prove the initial concept. once i had proved that, it took no more than a month to finalize a design. i booked a flight to kenya, to try it with some locals. >> the jompy is ingeniously simple, needing neither pump nor filter. the water travels through a coil, which is placed on top of the cooker. this enables users to do two things at once: cook food and boil water for drinking and washing later, while saving energy. plus, there's no danger of burns. >> the jompy stays cool during use. this is the good thing in closely knit communities, where this is put on the ground after use, where someone may stand on it or come in contact with it