A food dehydrator without a thermostat will dehydrate at a constant, unchanging heat, but at a potentially increasing temperature inside the dehydrator. This can cause case hardening; food with a dry outside but with moisture and potentially bacteria on the inside.
o Watts – The energy consumed or used by a dehydrator is measured in watts, similar to that of the light bulb. The watt power of a food dehydrator should be considered in relation to the total drying area. More drying trays and larger dehydrator dimensions should require more watts used by the dehydrator to ensure adequate food dehydration. You can compare the energy used or needed between different dehydrators by comparing the watts per square foot of total drying area. Simply divide the watts of the dehydrator unit by the total drying area to obtain the watts per square foot.