Electric to Aqualisa digital shower - flow rate question

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Hi folks,
I'm thinking of replacing my 10.8kW (mains-fed) electric shower with a Aqualisa digital shower (fed from my WB 37CDi combi + mains) so I've measured the following flow rates :

The flow rate from the electric shower (at a comfortable showering temperature) is currently 6l/min.

The flow rates from the bath (fed by the combi and cold mains in the adjacent bathroom) are 8.5l/min (max hot) and 15l/min (cold). These were measured independently.

NB. all the internal pipework is in 15mm, apart from the last foot or so to the bath taps, which is in 22mm.

Would I be right in thinking that the flow rate of a thermostatic shower is likely to be somewhere between those two values, so around twice as powerful as the electric shower ?

Cheers.
 
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