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A power shower will raise the pressure (like a pressure washer) but they can't increase the flowrate - remember pumps push water not pull it.
If you've got good cold water pressure coming into the house (and the combi boiler is the limiting factor with hot, for whatever reason), then they are probably a decent option - 1 bar = 10m elevation and system losses shouldn't be large due to (relatively) low flow rates.Edit: FWIW, our main shower head is ~6m higher than the house main and with a 35Kw combi, we get a 'hotel quality' experience!
Dramatic_Hammer
Fox
A power shower would fix the problem, because they have a built in pump. So even if your water pressure isn't great, they will pump the water up and heat it.
You don't need a storage tank with a power shower, because it has a built in pump to raise the water pressure.
Also the water tank doesn't have to go in the loft or up high, ours went in the cellar, we still had decent water pressure (without a pump). The pressure is balanced by the pressure from the mains supply.
Apart from this your advice is fine :P