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incalculavel

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I have a problem in my factory, and contracted a company to solve it, but unfortunately they were unable to do it.

I have a tank with 1.000 liters of water mixed with sand, that is pumped with a high capacity pump, through a compressed air system, to clean some small metal parts.

My problem is that I need the water mix to remain at 80ºC, and for that I have four 6.000 W electrical heaters, submerged in the water, for a total of 24.000 W of heating capacity. The temperature was my requirement, and 24.000 W was the solution the contracted company installed.

After 2 hours and 30 minutes working, the temperature drops to 30ºC, with all the electrical heaters working.

What I would like to know is the way to calculate the amount of heating power needed to maintain the water mix at 80ºC.

Knowing that the 1.000 liters water mix, starting at 80ºC, with 24.000 W of heating power turned on, after 2 hours and 30 minutes drops to 30ºC, is it possible to calculate it?

I really don't want to guess (like the contracted company did), and keep trying until I get enough power... I think that the correct way is to do the math.

Can anyone help me out?

Thanks

Jose Marques