I wouldn't fancy sticking a heater element in a plastic 25litre drum
to save yourself the hassle... is there no-one close to you who make bio, which you could swap some oil for ?
unless you just want to do it for fun/experiment/hobby... then I'd try to get one of those 10gallon metal buckets and build it inside there...
do you de-water your oil ? you could always heat your oil first, then put it in a well insulated reactor... it should stay hot enough to react ?
I have a new friend to make bio for me,
Just wanted something to play with
I do dewater, so i can just fill it with hot oil.
What a stirring paddle to mix it.
I could mount it through the lid on a bearing block.
And put a drain fill on the bottom to drain soap and fill with water for bubbling