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Technik Knowhow heat what we need and to make the liquid heating process more efficient than is possible with today’s kettles Heatle’s approach also addresses two other issues It argues that its single serving induction hob can also handle the duties of multiple pieces of specialised equipment such as baby milk warmers or egg cookers reducing the ewaste at the end of their operating lives And Heatle is designing its induction hob so that it can be easily repaired and also eventually disassembled into different waste streams for recycling The kettle problem the Heatle solution According to Wachtang Budagaschwili cofounder of Heatle there are several issues with the way that people heat liquids nowadays They may put twice as much water into the kettle as they need to reach the minimum fill line or just out of habit and so end up heating more water than they require If users limit the amount of water to the volume of the cup say 200 ml the energy efficiency still remains fairly low meaning that roughly half of the energy is wasted among kettles of a wide variety of designs and price points “Studies and reports show that we heat twice as much water as needed in our kettles the design of which is not suitable for modernday demographics We’ve made tests with about 20 different kettles in the office with different liquid levels and especially for single servings they‘re wasting 50% of the energy due to overboiling and inefficient technology and design ” said Budagaschwili “So even if we heat just the required amount in a kettle which rarely happens we still end up wasting half of the energy ” It’s also the case that when you heat water in a kettle and pour it into a cup you lose 10–15% of the temperature and thus energy which goes into heating up the cup If you heat the liquid in a cup you save the energy that would have gone into heating the kettle body The Heatle approach also ensures that the liquid reaches the desired drinking temperature in the cup rather than reaching that temperature in an external vessel like a kettle “Kettles as we know them have barely changed since the 1950s when the demographics were dramatically different from today Over 75% of German households are singles or two people and they rarely need to boil 1 7 litres of water at once The whole kettle system is just not designed for small amounts of liquid which are the amounts that we actually consume on a daily basis at our homes and offices ” said Budagaschwili “We want to incentivise people to only consume what they need ” Heatle’s solution is an immersive induction heater consisting of a small induction base and a metallic rod that goes into the liquid to be heated The rod is made up of two parts a 45 mm diameter stainlesssteel disc and a tube with an insulated handle that contains a temperature sensor that reports to the base over an inductively powered batteryfree Bluetooth circuit The liquid to be heated goes into a nonmetallic vessel that is placed on the base The coil within the base driven by an adaptive resonant frequency circuit under the control of a powerful microcontroller create an electromagnetic field that induces eddy Heatle heats the liquid directly Bilder Heatle Avnet Silica 8 EMS-Guide 2023 www markttechnik de