First garage I ever worked in had a Salamander heater. This contraption has probably been banned by the Health & Safety and if not by most insurance companies.
It ran, when it ran on a mixture of diesel and waste oil. It needed careful filling - no more than half full or the oil used to boil, catch fire and spew across the office floor!
Lighting it defined bravery......and you soon learned not to be the first in the workshop on a winters morning!
Arwyn