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View the thread, titled "Power shower outlet pipework" which is posted in Showers and Wetrooms Advice on UK Plumbers Forums.

Hi all,
I'm about to replace the pump used for my power shower / bath filler. It's a Stuart-Turner Turbo 30T 3.0bar pump, 22mm inlet and outlet. The installation has been done so that the 22mm outlet reduces to 15mm pipework within less than a metre of the pump. I was thinking of changing this, when I replace the pump, to 22mm as far as I can take it - around 5 metres until it disappears from the loft down into the bathroom wall cavity. Reasons for this are that I seem to recall hearing that 22mm should be used until as near to the shower/filler as possible and, currently, there must be around a 12m run of 15mm pipework from the pump to the shower - including the travel down the wall and across the bathroom.

So, the first question is, is it worth changing the pipework in the loft to 22mm? The follow-up question then is if it were to be a sensible thing to do, is it advisable to keep it in copper piping or it is feasible to do it in plastic such as the Speedfit stuff? Just a little concerned about the push fit joints holding up to the output from a power shower, you see 🙂
 
Pushfit is fine.
With rgds pipesize, you should follow manufacturers instructions but if not possible I don't see that changing the pipe will make much practical difference.
 

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Power shower outlet pipework
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Showers and Wetrooms Advice
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