Hi forum This is my first post and needs some help please, I am removing my bath and fitting a shower with conceal triple valve with diverter shower, the existing pipe works are all 15mm , pressure is ok , however when taps downstairs in the kitchen are opened , it cuts the hot water upstairs, The boiler is in adjacent room to the bathroom, and I was thinking of cutting the hot water pipe from the boiler as it passes through the bathroom and change it to 22mm to feed the shower. Will that make the flow rate and pressure better as to not be affected too much by other taps opening Will shower head and jets work together without any list pressure Or Should I just leave the pipes at 15mm and connect the shower Please help Thanks A
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