Thanks for quick reply
Its the efficient of the diesel versus water that is my only worry.
The diesel in the keel
is always pretty cold, since it get cooled by the surrounding sea.
On top of this tank is the second diesel tank(Boat bottom) with 800L and 900L water on top water is always cool too.
To heat up the keel tank would take very much energy how I see it.
And the solution wouldnt cost me much money
My other alternativ is to some how use a water intake and a inline cooler like a oil
I dont want to make moore holes in my steel hull
Greatketch is coming up with good points here...
its not a issue in my case.
hmm not such a genius idea after all. Maybe I have to test how easy it is to raise the temperature on diesel first.