that is what you have to weigh up, the combi mixer shower will be a far superior flow rate to an electric shower but the plus point of an electric shower is that it will still work if your combi boiler develops a fault so you still have a means of washing
Personally, I would much rather have the combi fed shower every day, with the realisation that when the combi breaks down I will have to do without for a day or two. No big deal.
I wouldn't have electric, as they are more expensive to run and the flow is usually pathetic compared to a combi-fed mixer.
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