Fin Tube Heater

fin tube
A tube with one or more fins.

heater
A fastball
A heater is object that emits heat or causes another body to achieve a higher temperature. In a household or domestic setting, heaters are usually appliances whose purpose is to generate heating (i.e. warmth). Heaters exists for all states of matter, including solids, liquids and gases.
device that heats water or supplies warmth to a room
A person or thing that heats, in particular a device for warming the air or water
A conductor used for indirect heating of the cathode of a thermionic tube
fastball: (baseball) a pitch thrown with maximum velocity; "he swung late on the fastball"; "he showed batters nothing but smoke"