Chofu Hot Tub Heater

hot tub
A hot tub is a large home-made or manufactured tub or small pool full of heated water and used for soaking, relaxation, massage, or hydrotherapy. In most cases, they have jets for massage purposes.
The following is an episode list for the Fox television sitcom Malcolm in the Middle. The show ran for seven seasons from 2000 to 2006 with 151 episodes produced.
A large tub filled with hot aerated water used for recreation or physical therapy
a very large tub (large enough for more than one bather) filled with hot water

heater
A person or thing that heats, in particular a device for warming the air or water
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 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"