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Most commonly, aquarium heaters are immersion style heaters, these heaters consist of a glass tube containing a heating element wound around a ceramic or glass insert. Some glass immersion heaters also contain sand, and most, but not all, are fully submersible. [1]
The inventor Alfred Kärcher (1901–59) from Baden-Württemberg founded the company in 1935 in Stuttgart-Bad Cannstatt.Initially, Kärcher specialised in the design of industrial submersible heating elements, i.e. in salt smelters which were heated with immersion heaters.
They developed the first submersible electric heating element. [ 1 ] In the 1970s, the company became a subsidiary of BSR (Housewares) Ltd., originally Birmingham Sound Reproducers , manufacturers of turntables for playing records .
A heating element is a device used for conversion of electric energy into heat, consisting of a heating resistor and accessories. [1] Heat is generated by the passage of electric current through a resistor through a process known as Joule heating .
Intermittent-use: There is a short delay (1–3 seconds) between when the water begins to flow and when the heater's flow detector activates the heating elements or gas burner. In the case of continuous-use applications (showers, baths, washing machines) this is not an issue as the heater never stops heating.
Solar heat is clean and renewable. This is the most modern system. Increasingly, solar powered water heaters are being used. Their solar thermal collectors are installed outside dwellings, typically on the roof or walls or nearby, and the potable hot water storage tank is typically a pre-existing or new conventional water heater, or a water heater specifically designed for solar thermal.