power shower problems


Firstly apologies for already posting this on another NG. =======================================Hi all
I'm about to install a power shower (I can imagine it's been covered umpteen times) but despite doing a previous search about my problem I've seen no answers/solutions.
The problem is that the cold water feed to the shower mixer comes direct from the loft water tank (normal) DOWN through to the mixer, whereas the hot water comes from the airing cupboard through the floorboards and UP to the mixer.
So my problem is getting the pipes close enough for the pump to connect to. I can't use a post-mixer pump due to wall cavity being so thin (barrats house!).
Solution - I was thinking of feeding the cold water DOWN to the airing cupboard and then feed it UP back in the loft to rejoin where cut into it. The problem I see with this is extra work for the pump, ineffective pressure (15mm pipes not 22mm) or the need for a negative feed switch (which then raises the question about the hot water feed being positive).
In an ideal world I'd feed the cold water down to the airing cupboard and then relay through the floorboards (same as the hot water feed), but the floorboards are larges T&G and very tough to get access to.
Thanks for any thoughts.
MRJP
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what I've decided now is to cut into the cold water feed to the shower and bring it into the airing cupboard and hook up to the pump, from there I'll rip up the floorboards ( a nightmare - it's sheets of T&G chipboard, about 2m x 0.75m and run UNDER the walls), using a circ saw. Done it before but hard work.

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