Hoefer RCB20-PLUS - Manual (Page 22)

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6.4 Adjusting the Pump Flow
The pump flow is pre-adjusted in the factory and
should be correct for most RCB20-PLUS uses. If it
does need changing it can be adjusted as follows:
1
Locate the Flow Adjustment Valve inside of the water
bath next to the heating element.
2
Turn the Flow Adjustment Valve counterclockwise up
to 360° to obtain the desired flow pressure, (Fig 3).
Figure 3.
Flow Adjustment
Valve.