The whole structure is made of food grade stainless steel metal materialsThe product adopts the power off reset type temperature controller to carry out double dry burning protectionAnti-scald protection function- can touch the open bucketEnergy saving good heat preservation time is more than 1 times shorter heating time is more efficientEnergy saving- save about 1.2KWH of electricity a dayAvailable in 10L, 20L & 25L