Salamander duel shower pump:different flow rate on h and c?

Discussion in 'Plumbers' Talk' started by take no sheet, Jun 10, 2018.

  1. take no sheet

    take no sheet New Member

    As above,to test the pump,have fit washer hoses to the 2 outlets and the cold outlet gives a much higher flow rate than the hot.Is this normal?The hot is fed from a flange on the cylinder and the cold from the header tank.The pump is about 9 yrs old.Thanx for any help.
    Regards.
    TNS
     
  2. just pumps

    just pumps Active Member

    You only get out what you put in with a twin headed pump.
     
    Heat likes this.
  3. take no sheet

    take no sheet New Member

    Thanks for that.So although the pressure into the pump should be the same on h and c the flow rate of the hot is lower since it has to run thro the cylinder first?
     
  4. just pumps

    just pumps Active Member

    Generally speaking yes but I can`t see your set up can I?
     
  5. take no sheet

    take no sheet New Member

    The cold feed to the cylinder drops vertically 3M from the header tank and looks to be in 1 1/4 copper.From the top of the cylinder, 22mm copper to the pump.The tank is 50G.The cold feed to the pump is 22mm plastic from the header tank.
    Regards,TNS
     
  6. just pumps

    just pumps Active Member

    You have different pressures.
     
  7. Heat

    Heat Active Member

    Yes, Just Pumps is correct. As his username suggests, he works with pumps.
    It depends on what you put into the pump.
    The hot will be a little more restricted.
    But you didn’t say whether it is a brand new install or existing?
    Got to check any filters - on pump inlets and on shower valves. The filters on the hot supply and on hot at shower valve are very commonly blocked.
     
  8. just pumps

    just pumps Active Member

    Thanks for the nod Heat, understand it is 9yrs old however the OP is testing it so unclear if it has just been purchased to replace one or for a new project. Personally I wouldn`t bother at that age but money can be short for some in this day and age.
     
  9. Heat

    Heat Active Member

    Sorry, - completely missed the OPs line - “The pump is about 9 yrs old”. :oops:
    As it is 9 years old, as well as partial blockages at filters, etc, the impeller could be damaged if plastic
     
  10. take no sheet

    take no sheet New Member

    Thanks for all the help,will check the filters and maybe replace the pump.
    Regards TNS
     
  11. Heat

    Heat Active Member

    If you can't find any obvious cause and do decide to replace the pump, then take a look at Stuart and Turner pumps, especially their Monsoon range. Expensive, but very good. Screwfix do them and definitely at a reasonable cost
     
  12. take no sheet

    take no sheet New Member

    Thanx for that Heat,will look into the ST pumps.
    Regards,TNS
     
    Heat likes this.
  13. just pumps

    just pumps Active Member

    Easy pump to dismantle and have a look around the inlet, outlet and the impeller.
     

Share This Page