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Thanks for reply. Fixed the "spelling", head is not working in the morning I understand that 24V should not be the problem, I am more worried about the 12V tap off as the supplies will be loaded unevenly and not sure whether that will create any problems.The control is just simple 12VDC automotive relay ladder logic. 24VDC relays are expensive.
I think that you have to check what happens to the system if one of them is overloaded or fails. For example what about the pumps operating at 12V?
What can the diodes do, if the pumps are heating, instead of pumping?