Homebrew immersion heater for stable fermenting temperatures.˜ Adjustable thermostat for accurate control of your brew.˜ Suitable for all sizes of fermenting vessel up to 25 litres, and can be used in glass or plastic containers.˜ Standard size rubber bung with airlock hole.˜ 230 volts 100 watts. The heater comes factory˜set to 24 deg C, and can be adjusted by the user˜from 14-34 deg C.