Introduction to CompostingHow does the size of the bin or heap affect composting? A larger heap/bin will maximise the volume of waste producing heat in relation to the surface area losing heat. In general terms, bigger is better, as long as you have enough waste to achieve the desired temperature. These considerations are included in the HotBin design. What should I do with additional thermometer? Place the thermometer in to the top / centre of the waste. Try keep it in the hottest top 10 cm - Make sure when you're adding new waste that you remove it or it may get lost in the heap! Locating the Key Parts of the HotBinHow does the HOTBIN insulation work? The ARPRO® material used to manufacture the HOTBIN offers outstanding insulation thanks to the millions of tiny air pockets within the 50mm walls. This provides excellent resistance to thermal conductivity and heat transfer which means HOTBIN stays hot and retains the heat generated by the bacteria.