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Do 2 single bath taps produce a better flow that mixer taps?

Discussion in 'Plumbing and Central Heating' started by francspencer, 1 Mar 2011.

  1. francspencer

    francspencer

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    Hi,

    I'm currently rennovating my bathroom in the loft.
    The hot tap at the moment takes a good 10mins to fill the bath.
    This is currently an old mixer tap.

    The pipework is 15mm, with standard iso valves which I am replacing with full bore ones.

    As I am also building a structure to hold a the cold water tank and fitting a pumped electric shower. (my mums electrician is doing the wiring)

    My question is,

    Will the bath fill quicker (from combi boiler) using a mixer tap or 2 single taps? Or is there no difference..
     
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  3. Jordon

    Jordon

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    Maybe depends on the incoming pressure and flow rate you have already on the watermain, also how many bathrooms you have and how many taps you have on at once. You can put a house pump in on negative head but need to calculate the tank size and cylinder size to allow for the bathrooms existing. Or jack the cold water storage tank up as high as you can. Oh and not really for the taps as long as they are for combi hp or gravity lp.
     
  4. Jordon

    Jordon

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    Also to add if you are fitting a pumped shower you will have to bin this if you fit a combi unless it's switchable to high pressure eg digital
     
  5. francspencer

    francspencer

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    1 bathroom only.
    Anybody know the answer to my original question regarding mixer tap?
     
  6. francspencer

    francspencer

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    Interesting answer.. may I suggest you re-read my post "pumped electric shower" Its the Mira elite st, which is fed by its own tank, it has nothing to do with the combi as the tank is cold mains fed.

    Does a mixer tap restrict flow compared to 2 seperate taps on a bath?
     
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  8. Jordon

    Jordon

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    I have read it may you re read my reply. If you change to a combi the house will become mains fed to all taps and showers this means a electric pump in the shower would not be allowed to pump a water main hence it would be redundant unless you are keeping a tank and cylinder with the combi boiler which would just be odd. Also the tap question I answered the taps should make not difference as long as they are for low pressure installations.
     
  9. francspencer

    francspencer

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    I already have a combi boiler. The cold water tank is being fitted high up in the bathroom. The tank is fed by the cold water main and then an electric pump is built into the shower unit. Please see the mira elite st on the mira site.
    Thanks for the answer regarding the taps.. its so difficult to explain my setup in a few sentences, I suppose I just have to type more.
    Thanks again
     
  10. Jordon

    Jordon

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    Ok I'm with you so the main to the house is quite low if you are fitting a pumped electric shower correct? This could be why the flow from the taps is poor! Do you know the flow rate you have from the taps and what Ltr a minute the boiler will allow? Are the basin taps the same flow rate as the bath? You need to teat with a wier cup to find out. Also what is the static pressure at the in coming main?
     
  11. francspencer

    francspencer

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    Yes.
    Just measured the flow from the kitchen tap which is located 1.5 meters above the boiler and 5 meters horizontally away.

    Hot water = 2 litres in 20 seconds
    Cold water = 2 litres in 16 seconds

    The bathroom is another 3 meters up above the kitchen.
    I purchased 2 x bristan lever taps for the bath in the end as I dont want
    to worry about non return valves restricting the flow even more.

    I've also added a Calcombi descaler between the new tank in the bathroom and the shower.
    Next step is to fit the new carronite bath in the morning, which I suspect will have to be high off the ground for the clicker waste.
    I'll hopefully have some more photos after the rugby tommorow.
     
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