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A few years ago we were having a shower installed, and the plumber insisted that he'd have to fit new, bigger pipes as it was more powerful than the previous shower - Grandad explained to him that it made no difference - and half an hour of arguing later the plumber left and we never saw him again; and Grandad installed the shower!
Can't pull the wool over his eyes
I hate to shatter an illusion here, but the plumber was correct. The issue is the difference between pressure and volume of delivery. Pressure in a system remains constant, but that means the smaller the pipe the less water delivered over a set time. Modern showers often have integral pumps which require a greater volume of supply and a 15 mm standard pipe may not be sufficient for optimum performance of the shower. When adding new showers or even specifying new build I will strive to get 22 mm all the way to the shower, or failing that with pumped showers I have installed separate header tanks locally to the shower so that it has its own 'reservoir' supply. The principle is the same as an old furred up iron supply pipe that has more than adequate pressure, but supplies naught but a trickle due to constricted volume. The shower installed by 'gramps' may well be working, but it would likely have relatively enhanced performance if it had increased supply volume. You may find its performance is altered if water is drawn elsewhere in the house at the same time? The plumber gave sound advice.