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Can anyone recommend a bath waste pump or similar for this?

Discussion in 'Plumbing and Central Heating' started by justigator, 13 Aug 2015.

  1. justigator

    justigator

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    I have a small, cramped top-floor bathroom. The bog and basin are adjacent to the plasterboard wall to the adjoining roof space, which is shown in the pic below. The bath waste, bog overflow and basin waste all feed into the main bog waste, which adjoins the soil stack just to the right of the picture. It has worked OK for many years. But the price paid is that the bath, which cannot be fitted on the same wall as the bog and basin without leaving too little headroom for a shower, has to be raised on a plinth on the opposite wall and the waste has to run above floor level. That needs boxing in and wastes valuable space. Even then the fall on the waste is well below the ideal minimum; within the roof space there is really no fall on the pipework at all.

    When renovating the bathroom I would like to reorient the bath 180 degrees so that the taps and deep end are at the same end as the shower rather than opposite as now, and also so that I can run the bath waste without consuming valuable above-floor space in the bathroom. It would be easy enough to have the re-routed bath waste emerge, after a decent fall, where the lower arrow points, below floorboard level in the adjoining roof space. But then I am left with the bath waste some 15-20cm below the centreline of the bog waste. Running a full new bath waste outside to a new boss on the (cast iron) soil stack would be quite tricky because of the construction of the roof. Installing a pump might seem overkill but I am happy to do it if it means I can continue to run the bath waste into the existing bog waste, inside the roof space. Because of the space limitations it would have to work with negative head, ie activate when it senses water in an inlet pipe below the level of the pump mechanism. Either that or it would have to be a very small unit indeed. Does anyone have any suggestions?

    Many thanks.

    I bathroof02 copy.jpg
     
  2. justigator

    justigator

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    It has just occurred to me that there might be just enough room, or I might be able to make enough room, to site a pump such as the smallest Grundfos one under the bath head itself. But suggestions for a solution in the roof space would still be very welcome.
     
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  4. picasso

    picasso

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  5. justigator

    justigator

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    Thanks; that's helpful although I think I'll try to get a 230v solution if I can.
     
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