Fitting a shower pump

16 May 2014
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United Kingdom
I would like to fit a shower pump for my bathroom shower which is gravity fed. I live in a bungalow & the supply to the shower comes down from the loft. The hot pipe comes from the hot tank in the airing cupboard, goes up through loft, along then back down to shower. The cold pipe comes straight from tank in loft. They both run parallel with each other in the loft before going down the inside of the wall to the bathroom. Could I just cut into these two pipes & put the pump in the loft? Also, where could I tap into an electrical supply from?
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Check the pump manufacturers instructions but generally speaking they'll want it a minimum of 1m below the base of your loft tank to prevent it sucking air in. Realistically this means that you'll need to put it in your airing cupboard.

You need to take the pump supply off a ring main circuit.
Okay so if its in the airing cupboard, would I have to tee in where I said earlier, but run pipes back down to pump, then back up to re-connect where I teed in?
1. Shower pumps require dedicated hot and cold feeds, so you can't just tap into existing pipes.
2. The best place for the pump is at the base of the hot water cylinder (HWC).
3. Check the manufacturers' specifications to determine whether you need a negative head pump or not. You must actually check, but as a guide line, if the shower head in its normal position is less than 600 mm below the base of the cold water storage cistern (CWSC) in the loft, then you are very likely to require a negative head pump.
4. The cold feed from the CWSC must exit the cistern below the level of the feed from that cistern to the HWC.
5. The hot feed from the HWC must be air free. This normally means using a special flange (e.g. Surrey, York, Warix) in the HWC. If the hot feed from the HWC rises at an angle above the horizontal, then a tee cut into this and pointing downwards may suffice, but again, check manufacturers' specifications.
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