Pump water from cold water tank and hot cylinder in loft

24 May 2004
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United Kingdom
I have a huge problem with water pressure in my flat and have recently converted my loft space into a bedroom and bathroom. I would like to install a mixer shower in the loft bathroom. Can I install a hot water cylinder in an airing cupboard next the shower in the loft and then take a water feed from the cold water tank in the loft, and use a pump to get the necessary pressure. Bare in mind that the cold water tank is in the loft too, and at a lower height than the mixer. Is there a special pump that facilitates this? Please help.

Unfortunately the mains pressure is too low to get any effective use out of an electric shower.

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Yes you can and you can use a normal shower pump as long as you can site the pump lower than the cold water tank. Otherwise you will need to look at buying a negative head pump.
You will need a negative head pump, as the shower head is above the cold tank.

From what I understand reading the manual for my shower pump, a negative head kit just has a pull-cord mounted to the ceiling to start the pump up instead of relying on gravity flow to start the pump. The pump itself is the same, it is an add-on kit.

I am not sure a standard hot water cylinder will be suitable as it will need the cold tank to provide head. I think there are special hot and cold tanks designed for this kind of purpose.
you can do it but the pump will need a dedicated feed from a seperate tank or a seperate connection to the same tank...however the capacity of this should be over 50 gal if you are pumping alternatively as the man said get a negative head pump and mix mains cold with pumped hot. you are meant to use a surrey or sussex flange to connect it but in reality just forget that and pump the whole flat not just the shower then you dont need to make a seperate connection ....was that garbled enuf for you
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You either need the ceiling (or air operated) switch OR a neg head pump, not both.

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