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Hah! Well I'll grab a sample from the one with the buggered element and have a look.
On the plus side, it's definitely working better than previously. It's only used when people are in the room (and the room has a fire extinguisher) so fingers crossed for no sudden surprises!
Do very much appreciate the input!
mmccarthy
Hefty
The fact that it says "anti-freezing liquid" rather than oil points to the possibility of glycol. Check the existing fluid now that you have voided your warranty and abandoned hopes of avoiding fiery death. If it dissolves in water, it's probably glycol, if it separates it's oil. If glycol, it will probably also have anti-corrosion additives, but you can ignore those for the purposes of a partial top up. Small quantities of pure ethylene glycol can easily be bought from any online chemical supply. Put your affairs in order, check that your home insurance covers reckless experimental chemistry, and good luck.