FIrst time posting but long time user and great tips and help by everyone.
I have started to redo our family bathroom and am going to put in an aqualisa smart shower above our bath. I am looking to chase the pipes into the wall but I had a question on the size of pipes needed. Our bath has 22mm fat pipes which was what I was going to chase up the wall to the loft and the new aqualisa shower/bath filler. Does anyone know if they need to be 15mm pipes or can I use 22mm (I would prefer to use 15mm if possible). If I go from 22mmm to 15mm will it reduce the flow rate I have in the bath? Ultimately I am trying to work out how deep to chase the pipes in as I have not got a lot of room.
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