UNUSED Deville Multi-Fuel Heaters, Blue Flame Technology this heater makes the most of the fuel. In the Deville burner, staged combustion ensures the fuel/air mixture is optimised. The central inductor tube (Exclusive to Deville) allows complete combustion of the hydrocarbons using very high temperature, result – no soot, which results in a steady blue flame. Clean, silent, free from odour, simple to use, with very low fuel consumption thanks to the TOBY distributor.