Heater Belt - 30w
This 30w heating belt will gently warm without creating major hot spots on your fermenter. It can also be moved up or down the fermenter to increase or decrease the heat transfer.
Combine your heat belt with a MKII - Temperature Controller for precise temperature control. If you're fermenting in a fridge, you can also use the MKII's cooling function as well to control both the belt and the fridge.