I think this is a misunderstanding.
These are 2 different things: output power of the pump (in Watts) and output voltage of the ProfiLux (in Volts).
Maximum output voltage of ProfiLux is 10V -> at this voltage the pump will have the maximum power (18W in your case).
As far as i know the Tunze pumps even have the maximum power at 8V control voltage.
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