Will shower pressure be less if switch to an unvented HW cylinder?

[ridgerunner]

Hi, am getting our bathroom updated and local company suggested ditching our traditional attic CW tank/vented cylinder and pump for the shower and install an unvented pressurised HW cylinder instead. We have been told that this will not lead to a drop in effective pressure from the shower. Is this correct? The power shower gives a great output and we do not want to lose any performance.
Our mains water pressure is high as we have fitted isolation valves to the CW taps, partially shut, to stop water blasting out of the sink. We have a WORCESTER 18i traditional boiler. Small 35 year old detached bungalow with one bathroom.
david

 

[moggy001]

I recently replaced my attic tank and vented cylinder with an unvented pressurised cylinder (after checking that my mains pressure was high enough) and it made an enormous difference! You should not get a drop in effective pressure and more likely to get an increase as you are no longer dependent on gravity/ height potential.

 

[Ben-gee]

You should not get a drop in effective pressure and more likely to get an increase as you are no longer dependent on gravity/ height potential.

The OP currently has a pump so this statement is incorrect.

 

[John.g]

If you only had a gravity fed shower then yes, of course, almost any mains pressure/unvented cylinder will give a increased shower flowrate but the OP has a pumped shower, dont know what pressure/head pump is being used but could be anything up to 3bar at the shower so its important that a static/dynamic test is carried out on the mains supply as the pressure at the shower might only end up at 1.5/2bar which, while quite adequate, may not meet his/her expectations?

 

[Timmy D]

I recently replaced my attic tank and vented cylinder with an unvented pressurised cylinder (after checking that my mains pressure was high enough) and it made an enormous difference! You should not get a drop in effective pressure and more likely to get an increase as you are no longer dependent on gravity/ height potential.

More likely get a drop in performance.