i want to fit a pumped shower system .can i fit the pump under the bath ,connecting to exsisting pipe work to the mixer unit or will i need to have dedicated supplies to the pump plus cylinder flange
You cannot use existing supplies. All mixer showers to function correctly and safely must have dedicated supplies.
A Surrey or Deleted flange may be necessary when a pumped shower is fitted, but a close connection to the top of the cylinder is often sufficient. Try first, and if air is drawn in, fit a flange.
You will also almost certainly have to increase the size of your header tank to satisfy the increased requirement of water
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