The perfect brewing temperature for Kombucha is 22-27°C 19-20°C is at the low end of ideal brewing. 10-18°C this range causes very slow fermentation with weak or yeasty flavours and the possibility of mould.
If you find your brew sitting below 20°C I would recommend helping your Scoby with some external heat.
This adjustable 7 Watt heating mat can increase your brew by few degrees (about 3-4°C above your room temperature) depending on the ambient temperature and the brew size. Just place your brew on top of your Heat Mat.
Features: Heat Mat distributes Heat evenly Extra thin design with maximum flexibility. Their shape sees a greater concentration of heat in a more defined location.
Specifications: Voltage: 220V-240V Plug Type: EU Standard + AU plug adaptor Color: Black Body length: approximately 280mm Width: approximately 150mm
Packing Content: 1 x Heat Mat(EU Plug) 1 x AU adaptor plug
Standard Shipping Cost:100% Free Shipping Standard Shipping Times: 5 - 12 business days