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I have had the problem for over a year now. The last shower I had had the same problem, but not on such a scale. We had a new shower fitted last week and it's becoming a nightmare. The reason we don't have a shower from the boiler is due to the issue of routing the pipework through the house and to the upstairs bathroom. apparently if we did have one which run from the boiler, we would still have the problem of the pressure dropping when the neighbours run the water.