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  1.  
    I need a funny shaped header tank for a vented system. It will probably have to be long and thin to fit in the space below the ridge of the roof. How feasible is it to build one? I was thinking of asking a fabricator to build a box out of stainless steel. Is it straightforward to make copper connections to the box?

    The other query was insulating it. It should not get too hot, but it would be sensible to have some insulation. I've seen these spray on foam companies. Might this work? Might there be a better solution?

    I'd be grateful for any comments!
    • CommentAuthorgyrogear
    • CommentTimeMar 12th 2017 edited
     
    How big does it need to be, and how much will it weigh, and how will it be supported ?

    gg
  2.  
    About 200 litres / 250kg / on steel superstructure, probably using a timber stand of some sort.
    • CommentAuthorgyrogear
    • CommentTimeMar 12th 2017
     
    Maybe you could use a plastic wheelybin with the lid welded in place, and cutouts in one of the sides ?

    240-liter version here...

    https://www.google.fr/search?q=wheelie+bin+240+liter+?&client=firefox-b&tbm=isch&imgil=hU_YCpLIRT2LsM%253A%253BWjBaBIo-g9AI2M%253Bhttp%25253A%25252F%25252Fwww.bigdug.co.uk%25252Fstorage-boxes-containers-c363%25252Frecycling-waste-bins-c234%25252F240-litre-wheelie-bins-p15160&source=iu&pf=m&fir=hU_YCpLIRT2LsM%253A%252CWjBaBIo-g9AI2M%252C_&usg=__E16WJx9KjjpRu6tykso85PTaNG0%3D&biw=1024&bih=641&ved=0ahUKEwi9lLadjtHSAhXHvRoKHYOcBs0QyjcINQ&ei=V1LFWP2MFsf7aoO5mugM#imgrc=hU_YCpLIRT2LsM

    Just a thought !

    gg
  3.  
    Nice idea! It would need to be heatproof in case the system overheated, and the space is really limited. A long (2m) cylindrical container would be good, but not quite the ideal shape, and quite expensive. I think the best solution will be to get one made.
    • CommentAuthorskyewright
    • CommentTimeMar 12th 2017 edited
     
    Posted By: ComeOnPilgrimI need a funny shaped header tank for a vented system. It will probably have to be long and thin to fit in the space below the ridge of the roof.

    Ignoring the DIY aspect, but have you tried a query like "coffin header tank" in a search engine?
    That should bring up links for various long thin pre-built tanks.

    Edit to add: e.g. Trying that and picking a link at random there was a 227 litre tank 1650mm x 460mm x 475 mm (L x W x H).
  4.  
    Get one welded up by a steel fabricator. IMO stainless steel is not necessary after all radiators are not stainless ! Connections are easy, you just get the fabricator to weld in iron pipe fittings where you want the connections. If you want a ball valve in it then you will need an open top otherwise it can be closed, but must have an open vent hole and either way it should have an overflow (usually led out to a gutter or just poking out of the wall. It must be insulated if it is in an unheated space and either EPS (but think about feeding the mice) or glass wool or what ever else you care to use that might be more expensive but have more eco-bling. If the space beneath the tank is heated then build and insulation box around the tank so as to include the tank in the heated envelope. Don't forget to insulate the pipes up to the tank if the space is unheated.

    Plastic is not a good idea for a header tank because if the heating goes pear shaped then the header tank can go all soft and wobbly and then sag and leak.
  5.  
    Thanks @skyewright, but I don't think these are going to be the right shape. I think I'll need something that is about 2000 mm long, and a funny shape (see attached).
      20170312 Header Tank.jpg
  6.  
    Thanks @Peter, that's just what I wanted to hear. What sort of thickness do you think I should specify for the sheet?
  7.  
    Depends how full you think it will be and if it will have a top. But 2mm should do it otherwise 3mm. Think about the weight of getting it to the location. If it is open top then 2mm if you get some cross supports (ties) between the long sides to stop any bow out. Best advice is probably be guided by what the fabricator is happy to use
    • CommentAuthorgyrogear
    • CommentTimeMar 13th 2017 edited
     
    Posted By: ComeOnPilgrimI think I'll need something that is about 2000 mm long, and a funny shape (see attached).


    well, you could get *THAT* shape done by a boat-builder !
    (looks just like a ... Water Tank !)


    cf. https://www.google.fr/search?q=water+tank+stainless+sailboat&client=firefox-b&tbm=isch&imgil=Qsccjyo3PHNJDM%253A%253B50x8GbDVHLU2NM%253Bhttps%25253A%25252F%25252Fwww.westmarine.com%25252Fwater-heaters&source=iu&pf=m&fir=Qsccjyo3PHNJDM%253A%252C50x8GbDVHLU2NM%252C_&usg=__iEafKlcWnPRwiyhHueihy00Acgc%3D&biw=1024&bih=641&ved=0ahUKEwjW0NGPqNLSAhWIzRQKHc-eDiQQyjcIKQ&ei=tfPFWJaiH4ibU8-9uqAC#imgrc=ILw9ii2xygz7iM:

    gg
  8.  
    I suspect that for a stainless steel tank you will need a second mortgage !
    • CommentAuthorowlman
    • CommentTimeMar 13th 2017 edited
     
    Is this a "Feed and Expansion" tank? I had a SS one made for my back boiler it's nowhere near as big. Cold feed at one end and overflow at the other.
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