Is it possible to heat your workplace with candles? I did the test for you.

[Christofix]

Just a note of caution, if you’ll permit. Do you make a lot of dust? (Risk of explosion) and what about the effects of increased condensation? (Rust)

Before I started this project, it was the first thing I thought about. I have a fairly good dust extraction system and the heating is suspended at a safe distance.
Also, I never leave the candles unattended and I have a fire extinguisher in my workshop. I have taken my precautions, but it always remains vigilant as usual.