Electrical Risks

Ethanol does not have the same heat capacity as water, if you are using an electric element in your boiler any distillate over 40% can be problematic, mostly because heating elements were designed for water, not ethanol. .

Static Discharge

Whenever you are dealing with high proof spirits, make sure everything is properly ground to avoid static buildup and potentially causing a spark that could ignite the ethanol vapours. This is more of an issue on dry winter days, but you should always use grounding straps/cables when transferring ethanol between two things (tanks, buckets, still, etc) in the open air.