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High and low pressure system nightmare.

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willingnotable

I am looking for some solid advice. I have moved into a 2nd floor flat that has a Potterton Puma 100 combi boiler. The cold water supply to the bathroom and ensuite shower room is fed from the communal tank in the loft. The building is 4 storeys (ie 1 more residential level above me and then the loft). The main bathroom has a mixer tap with incorporated shower function and the ensuite has a thermostatic shower. My problem, as im sure you can predict, is that the shower temperature fluctuates wildly from cold to hot and back again every 4mins or so. I have been advised that the system needs to be either all on mains pressure or all on low pressure. I believe my incoming mains pressure is around 2 bar. The flat above is all on mains supply and at peak times their mains pressure and flow is very low, so im reluctant to connect to the mains and suffer the same fate. Ive also been advised that I could install an accumulator tank off the mains and pump the pressure to 3bar, which would then supply both the combi and the cold outlets (ie. disconnect from the cws tank). However this would cost about £5k which right now I don't have. Are there any other solutions that might work for me - pressure equalisation controls on the existing set up etc etc? Any help would be greatly appreciated. Thanks.
 
dont use more than one shower/tap at a time for starters, otherwise your a bit up shyte creek with no paddle. you cant mix mains and stored water with a combi.
 
dont use more than one shower/tap at a time for starters, otherwise your a bit up shyte creek with no paddle. you cant mix mains and stored water with a combi.
Thanks for the response and info. Does that mean im left with looking at connecting fully to the mains directly (not ideal considering problems my neighbouring flats have had), or installing an accumulator tank type arrangement? If so, would just an accumulator tank suffice or would I have to have a mains boost pump installed to feed the tank too?
 
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