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Cold water tank query

Discussion in 'Trade Talk' started by Nbnsharp, 29 Apr 2013.

  1. Nbnsharp

    Nbnsharp

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    I am having a complete bathroom re designed and am having a wet room installed with a two headed shower, I have a normal boiler not combi and have a cold water tank in the loft. My plumber is telling me that I need to put another cold water tank in the loft along with my other tank because if I don't then I am being told that the tank will run dry within 10-15 minutes of use with the shower. I can't for the love of god understand what he means by this can anyone shed some light on it fit me before I hand over £150 for the new tank.

    Thanks
     
  2. PlumbGas

    PlumbGas

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    Not sure why he wants to do that as this won't help the hot water, If the shower is thermostatic then you'd need another Hot water cylinder, You should not need another water tank in the loft, to run that dry in a couple of minutes would be pretty much impossible, what type of shower is it ?, and are you having a pump installed ?,
    You might wanna get a second opinion.
     
  3. Nbnsharp

    Nbnsharp

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    The shower is a two headed shower, large square main and a smaller shower head in the side. I am having a pump fitted because I was also told that the shower would not run unless I have a pump fitted. Homebase is doing the work
     
  4. PlumbGas

    PlumbGas

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    (Homebase) yep sounds about right,
    What make of shower ?, yes you'll need a pump, what make of pump are they fitting ?, also were is it going and is it negative or positive head ?
    YOU WILL NOT NEED ANOTHER TANK, HE'S TALKING OUT OF HIS :evil:
     
  5. Nbnsharp

    Nbnsharp

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    The make of shower is a triton senate thermo mixer shower. The make of pump I'm not sure but its costing me £350 and is a negative pump he did not say where it's going.
     
  6. PlumbGas

    PlumbGas

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    Wouldn't fit a Triton, I'd go for Aqualisa, for £350 you want to make sure the pump is a Stuart turner, If its a Salamander you're paying to much for it.
     
  7. Nbnsharp

    Nbnsharp

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    Thank you so much for your help. Think I will be having a chat with the fitter and get all the information and come back on here. Pleased I have yet to pay for the whole amount and can back out at any time.
     
  8. onlyfitidealboilers

    onlyfitidealboilers

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    He may be worried that your draw off may be faster your tank can re fill so the overall volume of water is not enough especially if you add a pump on the shower?

    We carn't see the job, for all we know you may have a header tank feeding your cylinder?
     
  9. PlumbGas

    PlumbGas

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    I did think that but NA :!: :!:

    If the loft tank is full size then fitting a new tank will only increase the cold water, The hot water is what it is, unless they have something like a 300 ltr plus HWC and shower for ooooh lets say an hour a day, If it's a standard HWC say 150 - 210ish ltr there is no point adding another tank, I've never had to fit another loft tank in a standard domestic home,
     
  10. dreadnoughtheating

    dreadnoughtheating

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    Just to muddy the waters....

    There have been horrfifc instances of scalding where the mixer valve, thermo or not, cannot deal with a shortage of cold water from storage cisterns in roof-spaces, one was where the local fire service was testing hydrants, so no water flow into house, cold water outlet from cistern was above the outlet to base of cylinder. Water continues to exit cistern and so very quickly no flow of cold water, some mixers 'claim' shut-down if no cold water...

    Dreadnought
     
  11. onlyfitidealboilers

    onlyfitidealboilers

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    Pic of the tank may help no water in tank means no water in the cylinder and very poor pressure on the hot water.

    We are assuming it is a standard size, but trust me I have seen stranger things !!
     
  12. maltaron

    maltaron

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    I believe it is mandatory to fit the cold water outlet from the tank at least 50mm below the feed to the HW cylinder. This ensures that the hot stops before the cold to prevent scalding.
     
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