Electric fluid heater with thermosphonic fluid circulation

Electric resistance heating devices – Heating devices – Tank or container type liquid heater

Patent

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Details

134107, 219436, 219438, 219439, 219441, 392461, 392462, 392480, 392482, F24H 110, F24H 122, A47J 2700, H05B 102

Patent

active

051386933

ABSTRACT:
A fluid heater having a fluid chamber with a base wall and an upright sidewall is positioned above a feed chamber having an upper wall. A plurality of identical tubular passage heaters, each having an upper outlet end connected to the fluid chamber base wall and an inlet end connected to the upper wall of the feed chamber, are disposed in at least one lateral protective niche recessed with respect to the fluid chamber upright wall. Return ducts located inwardly of the passage heaters connect the base wall of the fluid chambers to the upper wall of the feed chamber. Thermostatically controlled electric heating elements helically disposed on the passage heaters produce a thermosphonic circulation of fluid from the feed chamber through the passage heaters to the fluid chamber and back to the feed chamber through the return ducts. The heating capacity of the fluid heater can be varied within wide limits by energizing different numbers of passage heaters. The passage heaters are removable to allow thorough cleaning of the fluid heater, which may be used as a deep fryer, water heater, or the like.

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