Pond Heaters

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

pond
A pond is a body of standing water, either natural or man-made, that is usually smaller than a lake.
Hold back or dam up (flowing water or another liquid) to form a small lake
Pond was a grunge band from Portland, Oregon. They formed in 1991 and broke up in 1998. They were signed to Sub Pop (first two albums) and the Work Records sub-label of Sony Records (last album).
a small lake; "the pond was too small for sailing"
(of flowing water or other liquids) Form such a lake