Vulcan seems to have started in Australia in the early 1950s. One of its first products was the Vulcan Conray electric radiator. The company also made Chef stoves and ovens.
In 1962, oil for home heating — for some reason unknown to this author — suddenly became very popular. Vulcan seemingly made thousands, if not millions, of oil heaters, which were installed in most new house builds through the '60s and '70s.
It would appear the oil/fuel crises of the 1970s put a very quick end to oil heating, as people deemed the cost of oil too high. An oil-to-gas conversion kit was manufactured and sold by Dean Martin Industries, so owners could convert an existing oil heater to gas without buying a new appliance.
Vulcan was at some point sold off to Rheem (Vulcan hot water heaters) and to Bonaire (Vulcan heating).
There's an interesting newspaper article scan from The Age newspaper of 5th July
1968 about Vulcan and its history:
news.google.com — The Age, 5 July 1968