how to melt used cooking oil in the collection tanks outside

like to know if any one can help me I cam collecting used cooking oil from the tanks that is put outside the restaurants they are freezing from the cold weather does any one knows how to melt the hard grease so it will be easy to collect please advice

I had a company make a 3000

I had a company make a 3000 watt drop in heater just for oil. Im just not sure it will be enough to heat our 300 gallon tanks we place at the restaurants in a reasonable time.

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