or you could use one of the small powersupplies, you know for the discman/printer/hubs ... I am sure you could find one rated at 24 volts .... power it from the same mains/strip/relay as the waterpump, so that it turns on with the rest of the watercooling.
I would be a lot less worried with that scenario than pushing a stressed powersupply where it is weakest.
bo v
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