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The question makes no sense.

what doesn't make sense ,the house has installed half of copper pipes and half galvanized the cold water is running fine but the hot water is slow and they said it might be because it has copper and galvanized piping mixed instead of all at once.

It makes no sense because you have used no punctuation beyond a single comma (where there should be a question mark). Even with punctuation added, the grammar would not great.

As to the problem, assuming that the pipes are the correct size (bore), and none are old and full of scale, the excuse as put by you here, is nonsense. What might have been meant, is that galvanised pipe is very thick-walled compared to standard copper, so that may be the problem - the pipes are really too small. What are the dimensions of the galvanised pipe?

You are also not comparing like with like.

Cold water will almost always be at mains supply pressure, fed directly off the rising main. Hot water will be at a pressure determined by the maximum head of the system - the vertical distance between the outlet and the highest part of the hot water system (which is usually a loft tank). In a house, this usually means that a hot outlet downstairs is at around double the pressure of any hot outlet upstairs. A standard installation would give at least a 6 foot head, usually more, even in a bungalow.

Measuring the static pressure of the hot water (the pressure at the outlet, with no flow), will tell you nothing because the problem could be pressure drop when there is flow, especially if the pipe is too small.

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Q: Can copper and galvanized pipes mixed cause the hot water pressure low new water tank and still low pressure?
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