Heater with distributed heating element

Details Heater with distributed heating element Heater with distributed heating element

H - Electricity

05

B

309/39

H05B 3/80 (2006.01) H05B 1/02 (2006.01)

Patent

CA 1152550

ABSTRACT A heater for heating liquids such as water in an aquarium comprises a water-impermeable housing including a heating section for immersion in the water. Within the heating section of the housing is a flexible, distributed planar heating element. The housing is resistant to breakage from mechanical and operating abuse and has a high heat transfer coefficient and high heat distortion temperature. To prevent the housing from melting when a control element of the heater malfunctions, preferably the aquarium heater includes temperature limiting means such as a circuit protection element comprising a material having a positive temperature coefficient of resistance. Preferably, the heating section of the housing is fabricated with large surface area walls to accommodate the planar heating element, and is provided with coupling means for maintainig the heating element thermally coupled to the walls of the heating section. The coupling means can be a ribbed support for holding the heating element against the heating section walls.

352096

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