Gravity fed system but told i cant install a shower pump??

Discussion in 'Plumbing and Central Heating' started by stevom2004, 23 Dec 2009.

  1. stevom2004

    Joined:
    23 Dec 2009
    Messages:
    2
    Thanks Received:
    0
    Location:
    Bristol
    Country:
    United Kingdom
    Recently splashed out on a steam shower system for a christmas treat. It needs a balanced water pressure to work effectively.
    I have a cold water tank in loft and hot water tank in airing cupboard and so identified my system as a gravity fed system and so bought a 3 bar twin impellar water pump to be installed. However the guy i got in to price up the job says that the cold is actually mains fed and so will not install pump. Please help, i have a feeling hes wrong as all the diagrams i look at online scream that it is a gravity fed system which m,eans it should be fine to install the pump....
     
  2. seco services

    Joined:
    3 Dec 2007
    Messages:
    15,645
    Thanks Received:
    1,247
    Location:
    Essex
    Country:
    United Kingdom
    is this the type of cylinder you have ?
    [​IMG]

    with two tanks in the loft ?
    what is he saying is cold mains feed ?
    have you any pics ?
     
  3. gas4you

    Joined:
    23 Feb 2007
    Messages:
    17,945
    Thanks Received:
    858
    Location:
    Norfolk
    Country:
    United Kingdom
    Sounds like he doesn't know what he is talking about :rolleyes:

    The cold feed for the shower will come direct from the cold storage tank that supplys the HW cylinder, to the pump, and the HW supply from the pump should come from its own fitting on the HW cylinder, thereby giving you a fully balanced supply.

    Your only possible problem could be, especially with a 3 Bar pump, that the cold storage tank is not big enough to supply enough water to keep up with the pump.

    I have assumed that by 2 tanks, you mean 1 large and 1 small, which would be the heating expansion tank.

    However you may have 2 large tanks in tandem. You need to clarify this first.
     
  4. stem

    Joined:
    20 Jul 2005
    Messages:
    2,001
    Thanks Received:
    291
    Location:
    Nottinghamshire
    Country:
    United Kingdom
    What you describe is a gravity hot water supply (By "hot water tank" in the airing cupboard I am assuming you mean "hot water cylinder" as per the photo from seco services) The existing cold water supply will probably be direct from the cold water main at a higer pressure and if so it will not presently be balanced.

    However a gravity cold water supply can be taken from the tank in the loft to feed the pump. Then as both hot and cold supplies come from the same tank, they would be balanced, as per the diagram below.

     
  5. kittedup

    Joined:
    13 Nov 2008
    Messages:
    596
    Thanks Received:
    157
    Location:
    Somerset
    Country:
    United Kingdom
    how big is the tank in the loft? You may have a combined hw cylinder which means all the cold taps will be mains fed.
     
  6. stevom2004

    Joined:
    23 Dec 2009
    Messages:
    2
    Thanks Received:
    0
    Location:
    Bristol
    Country:
    United Kingdom
    here are the photos of what is there...
     
  7. seco services

    Joined:
    3 Dec 2007
    Messages:
    15,645
    Thanks Received:
    1,247
    Location:
    Essex
    Country:
    United Kingdom
    thats a standard gravity hw cylinder
    so no prblem adding a pump to the system as shown above.

    fit a surrey flange or essex flange to the cylinder

    [​IMG]
    [​IMG]
    and cold feed from the cws.
     
  8. Nige F

    Joined:
    28 Jun 2005
    Messages:
    16,818
    Thanks Received:
    934
    Country:
    United Kingdom
    and cobble a bit more wood round the storage cistern :eek: some diagonal braces of 6x1 inch timber wouldn`t go amiss
     
  9. Jasonb

    Joined:
    20 Aug 2004
    Messages:
    2,420
    Thanks Received:
    93
    Location:
    Surrey
    Country:
    United Kingdom
    Thats quite a small tank in the loft and there is only ONE downfeed which is likely doing the hot.

    So cold must be off the mains. You would need to change to a larger storage tank in the loft and take an additional cold feed to the shower from it.

    Jason
     

Share This Page