It’s unavoidable that some of the manual coffee makers are made of plastic, but fortunately, most of them are BPA-free. If we are talking about plastic parts like handles, they don’t contact with hot water and, therefore, are not dangerous at all. It is safe to pour hot liquids in BPA-free reservoirs and leave it there as long as you like. Make sure to check the description of the product. If the manufacturer states that the plastic parts are BPA-free, you can go for that model without any worries.