Posted by John Marino on Thursday, May 17, 2007 - 11:07 am:
I was hoping to put this potstill on my stovetop ,indoors, to heat up - I have a good exhaust hood over stove and near a window also - is this ok to do inside ? or do I have to go outside with electric hot plate or propane for safety?
The problem with an electric range or hotplate is that they use thermostats. You can't heat the element up to 600 degrees, then let it cool down to 400, then cycle up again to 600, over and over and that's what a thermostatic control does.
The biggest safety problem is if you are using an open flame.
You are extracting a liquid that's more volatile than gasoline. It's fumes, especially if created by spillage, can make a big fire in less than a heartbeat. There's not too much danger of that unless you're distilling in a closet, which could fill with fumes, or a collection-vessel gets spilled or overflows. You just keep at least a couple of feet between your collection vessel and your open flame, and be sure the output hose isn't leaking in between them.
Best to keep a large-ish fire extinguisher wherever you are heating a still with any open flame. I use Propane, outdoors, for safety and convenience. It gets the wash up to temp fast, then I can turn it WAY down for the rest of the run.
You can get a good outdoor propane burner for cheap at Academy Outdoors, I think they're about $18, and you can mail-order them.
If using a hotplate, you need to disable the hotplate's thermostat, then use a 'Router Speed Control' to provide constant but lower current. You can get one cheaply at
www.harborfreight.com.
After you get your kettle up to boiling temp, you want to use as little heat as possible to keep it there. Too much heat will affect purity of the output.
A natural gas range will work as a heat source, if your still column is short enough to physically fit under the range hood. But keep in mind that you have to lift a kettle plus several gallons of liquid up onto the burner. And if an alcohol fire happens, it's right there in the house with you.