Tropical Tank Heater

tropical
Of, typical of, or peculiar to the tropics
Of or involving a trope; figurative
characterized by or of the nature of a trope or tropes; changed from its literal sense
Resembling the tropics, esp. in being very hot and humid
relating to or situated in or characteristic of the tropics (the region on either side of the equator); "tropical islands"; "tropical fruit"
of weather or climate; hot and humid as in the tropics; "tropical weather"

heater
fastball: (baseball) a pitch thrown with maximum velocity; "he swung late on the fastball"; "he showed batters nothing but smoke"
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.
A person or thing that heats, in particular a device for warming the air or water
device that heats water or supplies warmth to a room
A conductor used for indirect heating of the cathode of a thermionic tube
A fastball

tank
A large receptacle or storage chamber, esp. for liquid or gas
an enclosed armored military vehicle; has a cannon and moves on caterpillar treads
A receptacle with transparent sides in which to keep fish; an aquarium
store in a tank by causing (something) to flow into it
The container holding the fuel supply in a motor vehicle
a large (usually metallic) vessel for holding gases or liquids