Well said Mr. Cool, agreed with all you texted.
I use a provap 110V. My provap stabilizes at 230C. Initially the unit may reach 237-240 at most, but cools quickly to 230C. I have used my provap 110 for years now.
Regarding Formic acid and Oxalic acid, although both are considered organic acids there is a lot of difference between the two acids. Formic acid being more toxic and less forgiving. This is reason for my use of Oxalic acid only. Formic acid is a single carbon molecule whereas Oxalic acid is a double carbon molecule. Without going into the boring chemistry, the double carbon molecule, Oxalic acid, is less toxic, more forgiving.
Formic acid when heated enough forms formaldehyde. Formaldehyde is absolutely deadly, on all life: yeast, fungus, mold, bacteria, cells of all types. Thus formaldehyde is used in embalming process because the gas inhibits all living matter. Formaldehyde is a single carbon molecule just as Formic acid. Not the same though but close.
Formaldehyde upon addition of oxygen forms Formic acid.