Low pressure shower & air in radiator

Joined
15 Feb 2012
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Location
Cleveland
Country
United Kingdom
Hi all,
I need a bit of help with my shower.
We moved into our house in December. The shower above the bath is very weak. It is a thermostatic bar mixer with piping from the bath's hot tap and cold feed from the header tank in the attic. The bathroom is on the 1st floor, hence a max head of half a metre.
I want to do something simple to increase pressure. The shower doesn't need to have loads of power, just more than it has now.
My thoughts are to raise the level of the header tank by a metre by building a timber frame. Is this the best way? Any other suggestions without ripping out my nice bathroom to get to pipes etc?

Another query which may or may not be related... The bathroom radiator keeps filling with air and needs bleeding every week. This is a new radiator and i had a new boiler + pump fitted earlier this year + the whole system flushed out twice. I've turned the central heating pump down to the lowest setting which helped but air still ends up in the radiator over time. I've read that the air could be getting in through an air vent in the loft... ??
I know the CH system and the shower are fed from separate header tanks so the issue shouldn't be related... but before i got the boiler changed, if I turned the hot water on without CH, the upstairs radiators would get hot! bizarre.

Any help with these issues would be very much appreciated.
 
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