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Size of hot water tank

  • 06-12-2011 8:54pm
    #1
    fathersdaughter
    Registered Users, Registered Users 2 Posts: 27 ✭


    Hi there,

    Just wondering what size of water tank people would recommend me to put in our new build. We will have geothermal heating which will heat all our hot water.

    Have spoken to others who have our system already installed and are very happy with it. These people all have 200L tanks and have said they never run out of hot water so we were thinking of going for same. However our builder seems to think this is a bit small!!

    Any opinions please?!


Comments

  • #2
    Mr.Success
    Closed Accounts Posts: 161 ✭✭Mr.Success


    fathersdaughter wrote: »
    Hi there,

    Just wondering what size of water tank people would recommend me to put in our new build. We will have geothermal heating which will heat all our hot water.

    Have spoken to others who have our system already installed and are very happy with it. These people all have 200L tanks and have said they never run out of hot water so we were thinking of going for same. However our builder seems to think this is a bit small!!

    Any opinions please?!

    Depend how many is living in the house, For example how many showers/baths will be had in the morning. And dish washing etc during the day. No harm to have it oversized as, at least you wont run out. It also shouldn't cost you any more to heat as its geothermally heated


  • #3
    fathersdaughter
    Registered Users, Registered Users 2 Posts: 27 ✭fathersdaughter


    Mr.Success wrote: »
    fathersdaughter wrote: »
    Hi there,

    Just wondering what size of water tank people would recommend me to put in our new build. We will have geothermal heating which will heat all our hot water.

    Have spoken to others who have our system already installed and are very happy with it. These people all have 200L tanks and have said they never run out of hot water so we were thinking of going for same. However our builder seems to think this is a bit small!!

    Any opinions please?!

    Depend how many is living in the house, For example how many showers/baths will be had in the morning. And dish washing etc during the day. No harm to have it oversized as, at least you wont run out. It also shouldn't cost you any more to heat as its geothermally heated


    There'll be five of us in house. 2 adults, 3 children.


  • #4
    BryanF
    Moderators, Home & Garden Moderators Posts: 10,146 Mod ✭✭✭✭BryanF


    fathersdaughter wrote: »
    There'll be five of us in house. 2 adults, 3 children.
    allow for future teenager needs, 300L imo


  • #5
    refco
    Registered Users, Registered Users 2 Posts: 47 ✭refco


    i would go 300 l as well 5 living plus weekends with a guest or 2 and as bryanf said think of the future when there is a rush on the showers in the morning


  • #6
    Carlow52
    Closed Accounts Posts: 2,389 ✭✭✭Carlow52


    BryanF wrote: »
    allow for future teenager needs, 300L imo

    Based on our lot of teens that could be per teen:D:D

    OP: on the geo, its all very well to say others have the same system above ground but what is crucial here is the geology of your site and the plans for extracting heat from it.

    I cannot stress that enough so u need all the underground intell sorted before u sign.

    For example someone might have several 100 m's of pipe in a lake or stream as the source and u are sitting on solid rock with not a bit of water in sight


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  • #7
    kboc
    Registered Users, Registered Users 2 Posts: 458 ✭✭kboc


    i have a 500l tank. it is tripled coiled (3rd coil for possible future solar panels). Each coil is 33mm pipe in diameter (normal tank 25mm diameter). The linear metrage of each coil inside the tank is approx 5.5m (normal tank is approx 2.5m).

    This tank is specifically built by a firm for the plumber who done my house. He said that 1 hour at night rate will heat all that hot water because this tank is built for Heat Pump systems. He is right! Costs me 22 pence sterling per day for 500 L of hot water.

    Happy days

    So it is just not the size of the tank but the make up of the tank.


  • #8
    fclauson
    Registered Users, Registered Users 2 Posts: 1,691 ✭✭✭fclauson


    kboc wrote: »
    ... Costs me 22 pence sterling per day for 500 L of hot water.

    Dont want to doubt you - but if 500L was stone cold it would cost more than 22 p to heat :mad:


  • #9
    kboc
    Registered Users, Registered Users 2 Posts: 458 ✭✭kboc


    fclauson wrote: »
    Dont want to doubt you - but if 500L was stone cold it would cost more than 22 p to heat :mad:

    sorry, you are right of course. I think it took 2 nights to heat from scratch when the system was commissoned. but since then one cyle each night leavs more than enough HW.


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