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I am planning on building an immersion heater to heat oil when it is -20 C degrees outside. I need some help calculating the heat transfer. I want to find out how long it would take to heat around 10 litres of oil from -20 degrees to 10 degrees using an immersion heater with a constant surface temperature of 100 degrees C and a surface area of 0.1m^2. The oil is in a iron container with a dry weight around 10kg I am stuck when it comes to accounting for the heat loss due to the cold iron and the outside air. It would be really helpful if someone had an idea which equations to combine.

Many thanks