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[Roger Welton]

an accumulator wont increase pressure, just flow (if sized and pressurised correctly)

 

[Ray Stafford]

an accumulator wont increase pressure, just flow (if sized and pressurised correctly)

The Stuart Turner unit will increase both, because its a combination of mains pump and a small accumulator.

 

[Gasmk1]

Ok re accumalators I don't get involved much with plumbing side I am primarily a service and breakdown engineer gas. But think you are going to have to force the architects to give you a plant room, for the water mains