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What Size Water Cylinder?

  • 19-03-2013 6:30pm
    #1
    HurlingBoy
    Registered Users, Registered Users 2 Posts: 98 ✭✭


    Hi,
    I am building a new house and wondering what size water tank to put in? The house is 2700 sq ft has 2 ensuites and 1 main bathroom with a shower and bath. Is a 300 litre tank sufficient? The tank is in the garage.


Comments

  • #2
    Outkast_IRE
    Registered Users, Registered Users 2 Posts: 7,516 ✭✭✭Outkast_IRE


    Will it be a pumped system or all gravity fed ?
    Do you plan on connecting solar or any other additonal heat source to it?

    How many people do you plan on living in the house ?


  • #3
    HurlingBoy
    Registered Users, Registered Users 2 Posts: 98 ✭✭HurlingBoy


    Outkast_IRE wrote: »
    Will it be a pumped system or all gravity fed ?
    Do you plan on connecting solar or any other additonal heat source to it?

    How many people do you plan on living in the house ?

    Pumped system with solar panels.
    5 People living in the house.


  • #4
    daver123
    Banned (with Prison Access) Posts: 208 ✭✭daver123


    HurlingBoy wrote: »
    Pumped system with solar panels.
    5 People living in the house.

    This info below is from kingspan when choosing a cylinder

    This is dependent on your household’s hot water
    demand, which is estimated at 50 litres per adult / per day.
    Cylinder storage size is calculated at twice the demand.
    Therefore, we would recommend a 200 litre cylinder for
    a one to two adult household and a 300 litre cylinder for
    three to five adults


  • #5
    Outkast_IRE
    Registered Users, Registered Users 2 Posts: 7,516 ✭✭✭Outkast_IRE


    HurlingBoy wrote: »
    Pumped system with solar panels.
    5 People living in the house.
    So am i right in thinking there arent any showers in the ensuites ?
    Or are they electric ?

    I think 300 would do you fine, just be aware in a pumped system and with power showers etc the different showers can have vastly different flow rates.

    These flow rates mean extra water usage, if you have family members who like 1/2 hour long showers then the flow rate of the shower adds up, just something to keep an eye on when browsing.

    Just as an example look at this mixer shower compared to a standard one , its half the flow rate
    http://www.tritonshowers.ie/eco-showers/unichrome-dove-eco.aspx


  • #6
    shane0007
    Closed Accounts Posts: 4,677 ✭✭✭shane0007


    Vcyl = 2 x Vn x P x (Th - Tc) / (Tdhw - Tc)

    Vcyl = cylinder volume
    Vn = DHW demand person/day
    P = number of people
    Th = temp at outlet
    Tc = temp of cold inlet
    Tdhw = temp of stored water

    Therefore

    2 x 40 x 5 x (45-10) / (60 - 10)

    = 280 litres for 5 people


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  • #7
    ccsolar
    Registered Users, Registered Users 2 Posts: 423 ✭✭ccsolar


    HurlingBoy wrote: »
    Hi,
    I am building a new house and wondering what size water tank to put in? The house is 2700 sq ft has 2 ensuites and 1 main bathroom with a shower and bath. Is a 300 litre tank sufficient? The tank is in the garage.
    Hi
    The Seai recommend 50 litres per person living in the house + 50 litres for services
    Considering that the average family is 5 people you would need between 250 and 300 litre tank.
    The vast majority of new houses install a 300 litre tank, you also need to consider what size solar system you are going to install?
    If the tank is too big the solar will struggle to heat it and if its too small you will have over heating issues and the solar system will not be working to its maximum capability.
    Are you fitting a secondary return on the tank as you also need to keep in mind the distance between the tank and taps, you could end up running off water from the hot taps while you for the hot water to arrive.
    If you have a water metre fitted this could be costly..
    Cc


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