Comment by ravenstine

With an electric boiler, risk of fire is essentially zero. But if it did boil over due to cooling system failure, something else in the room (a spark from a relay, etc) might cause an explosion. This is why runs always need to be human attended and monitored, unless it is truly a bulletproof well tested setup that is designed for automated operation.

The ultimate alcohol boiler for small runs is an electric water heater. They have an inert glass coating on the inside, and as long as all plastic is removed and fittings are replaced with lead-free copper then it's safe.

You can match the heating element to the still head and always be assured of running it at exactly its maximum speed. Both heating elements can be used to speed up initial heating of the contents before dropping down to one element for the run.

Get a short, stubby water heater for best results. Then you can set your receiving pot and other stuff on top, like it's a table. Most painless and trouble free distilling experience ever.

Nixon and McCaw wrote a great book on distilling and they also sell a fine copper wool packed column that, at full length with extension, will support 1500W continuous boiler power. The stainless pot they sell as a boiler is good to get started with and works as a great receiving pot for the water heater boiler. If you upgrade the bottom water heater element to 6000W (normally 4500W in most heaters) and run it at 120V (half voltage), that drops it down to 1/4 power or 1500W, so a perfect match.