Appliances for heating beverages; Appliances for heating foodstuffs; Beverage heaters, electric; Beverage warmers, electric; Electrical apparatus for heating beverages; Electrically-heated mug sleeves; Thermoelectric cooler/heater for food and beverages; Portable thermoelectric cooling and heating unit for food and beverages; Thermo-pots, electric; Electric cup heaters; Biogas fermentation reactors, namely, percolating fermenters and dry fermenters; Electrically heated mugs; Electric mug warm...