Shower flow rate...

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We currently have an old electric shower fitted in our house, for which the wiring is sub-standard. Rather than have to rewire, and have all the mess that involves, I was hoping to fit a bath shower mixer tap.

The boiler is a protherm 80e Combi, with a specified flow rate of 11.2l/min @ 30°C rise and 9.6l/min at a 35°C rise.

This is probably a stupid question, but is this a satisfactory flow rate for a shower? I'm particularly thinking that the temperature rise in the winter will probably be higher leading to a lower flow rate... (is the drop in flow rate linear? I.e Can i assume a 1.6l/min drop per 5°C increase in temperature rise??)

Thanks in advance.

Tryster

PS If I've missed out any key info, please let me know and I'll try to provide it.
 
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No electric shower provides more than 4 ish llitres /minute, so yes a combi is better. (24kW vs say 8-10kW)
Thermostatic or pressure balanced mixer would be advised.

Yes, flow x temp rise = energy, so you notice the difference a bit in the winter.
 

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