What's a good flow rate for a bathroom basin?

Discussion in 'Plumbing and Central Heating' started by butako123, 30 Oct 2021.

  1. butako123

    butako123

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    Were having our upstairs bathroom replaced. Our system is gravity fed pressure from tank in the loft. It seems to be a trend that modern monobloc single lever taps seem to have quite low flow rates, to save water. My wife likes a Hansgrohe tap which is rated at 4 l/min at 0.2 bar. Which sounds quite low to me! (Our old taps I measured them at 8 l/min).

    Is 4 l/min just a dribble or good for cleaning teeth/washing hands? Are there recommended building codes for minimum flow rates? Would you be happy with 4 l/min in your bathroom sink?

    Here is the tap, looks beautiful: https://www.hansgrohe.co.uk/article...-min--0-2-bar-without-waste-71101010#techdata
     
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  3. Munroast

    Munroast

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    why do you not reduce the flow from your existing tap to 4l per min, (you could probably do this from the isolating valve on the pipe leading to the tap) then asses over the next few weeks if it is sufficient.

    just measured 4 litres per min, and it is tediously slow. Of course you will never know how well it flows until it is fitted, your water pressure may be above 0.2bar, I have no idea if that is high or low on a gravity feed.
     
    Last edited: 30 Oct 2021
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  4. butako123

    butako123

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    thanks Munroast. Don't have much time as the bathroom work has already started.
    What is the "normal" for bathroom taps? Surely there must be some industry guidelines or regs about what is good/bad flow rate?
     
  5. denso13

    denso13

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    Not really, just set your kitchen sink tap to 4l/min and see what you think.
     
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  6. Dereekoo

    Dereekoo

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  7. denso13

    denso13

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    Nothing to do with minimum mains pressure/flow, we are discussing a cistern fed system.
     
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