Those of a certain age may remember the "Salamander " heater.
Basically, a large , circular washing-up bowl ,about 3 foot diameter....a slightly conical lid with a small circular "hit and miss" vent and a chimney with multiple louvre-slots up it, increased diameter for a couple of feet then extended as a parallel cylinder for another couple. a smaller,L-shaped pipe projected from the side and re- entered the lid....top of the chimney also had a flip-over tinlid. These found favour in the smaller garages, as they burnt waste sump-oil and gave out a lot of radiant heat. Originally tasked to keeping frost off the Kentish hop-fields, they'd burble away like a pulse-jet.
If one was careless and allowed water in , this would start to boil and thermal -runaway would ensue, closing the vent and shutting the chimney-lid were ineffective, the monster would roar, exude flames from all the louvres, the boiling mixture in the "washing-bowl " would spit and bang and the dull-red metalwork wouldbecome bright orange.
As the thing stood in a wire frame, those of a brave disposition could attach a long bar and very carefully drag the inferno out of the building. the slightest slopping of the basin contents would elicit a frightening gout of flame.
The answer, again, was a hosepipe. judiciously applying water to cool the metal and oil, WITHOUT getting any inside. one could eventually regain some semblance of control
They were, of course, designed to run on clean paraffin or gas-oil (Diesel).....but who could resist free heat with a constant supply of sump-oil.
Insurers would not pay out on a fire involving a "sally".