JG 40 - Can the device also be operated without the cover? Gustav 06 August 2025 12:22 Updated Please operate the appliance together with the cover, otherwise an even and constant temperature cannot be guaranteed. Related articles JG 40 - Is it necessary to screw the glasses shut? JG 40 - Does the device continuously consume 40 W? JG 40 - Can glasses and lids be sterilised in a steamer at 100-120 degrees? JG 80 - Is there a recipe for making lievito madre (wheat sourdough)? How can I obtain spare parts and accessories?