two showers on one combi (split thread)

Discussion in 'Plumbing and Central Heating' started by spatchtadley, 7 Feb 2012.

  1. spatchtadley

    spatchtadley

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    I want to do a similar thing.

    We have a Worcester 40 CDi combi boiler and what I think is pretty high water pressure.

    I'm hoping to run two mixer showers on this system.

    Couple of questions...

    1) are some showers better at dealing with changes in water pressures - for instance if someone turns on a tap somewhere else in the house - or starts running the other shower.

    What showers does everyone recommend?

    2) what is a satisfactory flow rate for running two showers simultaneously. I'll run a tap into a bucket and calculate the flow rate.

    3) would fitting flow regulators help keep the pressure/temperature stable in the shower?

    Any suggestions greatly appreciated.

    Al ;)
     
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  3. Agile

    Agile

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    Open pipe flow is irrelevant!

    You need to know the dynamic flow rate!

    The boiler can heat about 6 li/min for each. Thats meagre but about what an electric shower can give!

    Tony
     
  4. spatchtadley

    spatchtadley

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    Thanks Tony

    I'll see if I can get hold of a pressure guage so I can measure this.
     
  5. spatchtadley

    spatchtadley

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    I've decided to forget about the second bathroom for a while and get the first one done.

    When I eventually refit the second bathroom, I can decide whether to fit an electric or mixer shower.

    Now I have a different question. I've been researching my options for the various shower types and don't know whether to go for a thermostatic mixer or a pressure regulating mixer. There seems to be contradictory info out there.

    For instance, would I be best to go for a Mira Combiforce or a thermostatic type like the Mira Discovery or Mira Element?

    Would any specific type be better in a two shower household?

    What do you reckon?

    Al
     
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  7. Agile

    Agile

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    The mains flow rate is equally relevant whatever way you heat the hot water!

    Tony
     
  8. rich4nancy

    rich4nancy

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    Hi

    Thermostatic showers will reduce the chance of temperature differences etc if water is demanded elsewhere. If your having 2 showers then maybe worth considering an electric unit as they are good for back up if your boiler ever fails.
     
  9. spatchtadley

    spatchtadley

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    Right Tony, I have got myself a pressure gauge.

    I put the gauge on our outside tap, then run the upstairs bath cold tap at full tilt.

    The gauge showed 64 psi / 4.4 bar with the tap running.
    Turned off the bath tap and the gauge showed 115 psi / 8 bar.

    I hope this means something to you - it doesn't to me!

    Does it mean that I've a reasonable chance of running two showers off my Worcester 40 CDi?

    Cheers

    Al
     
  10. middlesbrough

    middlesbrough

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