A storage tank for receiving condensate from the evaporator of a dehumidifier includes a switch which signals when the tank is filled. The tank includes a cover upon which the condensate impacts after falling from the evaporator. The condensate flows to a drain passage of the cover to enter the storage tank. A spherical float is floating freely on the stored condensate. The underside of the cover forms an upwardly inclined guide surface which guides the float toward a switch as the level of condensate rises, whereupon the float actuates the switch.
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