The crossword solution for the term 'CONIC HEATER' is 'ETNA'. Etna is an active stratovolcano located on the east coast of Sicily, Italy. It is the highest active volcano in Europe and one of the most active in the world. The volcano is known for its frequent eruptions, which have been recorded since 1500 BC. The conic heater is a type of heating device that uses a conical shape to direct heat in a specific direction. It is often used in industrial settings to provide localized heating.