Brewbelts, heating trays and immersion heaters.
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Electrim Heating Tray - for 1 demijohn
£22.99

Four sizes of these heating trays are available. All models have a power on indicator, thermal insulation in the base, and are safe to use with both glass and plastic containers. The 2 & 4 demijohn, and the 5-gallon, models all come with a built in spillage tray, and a detachable power lead.