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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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Housing - New Build: Solar heating; cylinder help needed, Urgent

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    • CommentAuthorWilliam
    • CommentTimeMar 14th 2007
     
    I am building a new , 2 bedroomed, detached, 1.5 storey house.
    I have opted for a condensing gas boiler, with a seperate unvented cylinder to run my hot water and underfloor heating. I want to add solar water heating in the future.
    I am told I need a twin coil tank ( one coil for future solar) and that the solar connection will be made to the top coil. Is this right?
    I was on a manufacturer's web site which shows the solar coil as being the bottom of the two coils.
    Which is correct?
    •  
      CommentAuthornigel
    • CommentTimeMar 14th 2007
     
    The bottom coil is the solar one.

    The boiler heats the top half of the cylinder and the solar heats the whole cylinder.
    • CommentAuthorSolar bore
    • CommentTimeMar 16th 2007
     
    Nigel is right

    However why not have a third coil put in so that if you went for Ground source heat pump or wood burning boiler you would not have to start again I made that mistake when we had or solar panel fitted.
    • CommentAuthorGuest
    • CommentTimeMar 16th 2007
     
    Hi

    I am building a new house and wanted a cylinder with three coils in it for solar wood burning boiler and condensing boiler. I've been told this is not possible with a pressurized system is there any way round this.
    • CommentAuthorSolar bore
    • CommentTimeMar 18th 2007
     
    Don't know,

    Other than to ask why you are installing a pressurized system?

    Is the boiler a combi -type?

    If so. I believe they are far more expensive to provide a pre-heater vessel for

    could you not fit a indirect cylinder.

    I would ask a manufacturer of cylinders mine was made by McDonalds Engineers on 01592 611123 it was ordered by my Solar panel man,

    lookforward to your reply.
    • CommentAuthorGuest
    • CommentTimeMar 18th 2007
     
    [Highwayman as guest] to the other guest

    You can't have an unvented cylinder with an uncontrollable heat source such as a wood burning stove for safety reasons. Why not? Because there is a risk of raising the stored water above 100 degrees, which means the next time a hot tap is opened you get superheated steam, boiling water and serious scalds.
    •  
      CommentAuthorSpike
    • CommentTimeMar 18th 2007
     
    You can have an unvented cylinder with an uncontrolled heat source, but it needs controls to divert excess heat away from the tank when the cylinder is fully up to temperature - such as into the heating circuit. So says my heating engineer who is working on my system now (triple coil: condensing boiler, wood burning stove and solar). Obviously, the diverting valve will have to fail safe.
    • CommentAuthorGuest
    • CommentTimeMar 19th 2007
     
    Hi

    To answer solar bore's question about the pressurized system I was told by a number of companies who where quoting me for the heating system that I would be mad not to install it, as this is not my field of work I took what they said to be right. I received plans on how to install the uncontrollable heat source (wood stove) and the plumper said it was too complicated and would be dangerous in case of power failure, therefore not allowing the excess heat to be diverted.

    Hope this makes sense..
    Thanks
    • CommentAuthorGBP-Keith
    • CommentTimeMar 19th 2007
     
    I've got a three coil cylinder. I just specified it and the manufacturer supplied to order. it is vented though. I've always been worried by unvented systems but apparently vented systems are almost unheard of now. I've got to change my accumulator tank (another system) this year and I guess unvented will be the way I'll go. but I think I'll get an expert in to advise or fit it. Oddly my baxi boiler has taken to running at just about 100 degrees c for the last couple of months. i've got exceptionally dry wood. I must phone the Baxi agent up and discuss it with them. it gets so hot that the flue fan shuts down and just the water pump keeps running till things cool down a bit.
    • CommentAuthorGuest
    • CommentTimeMar 22nd 2007
     
    ..just passing, but an excellent forum for discussing solar/ woodburner issues can be found at http://navitron.org.uk/forum/index.php?board=6.0

    .cheers..pete
    • CommentAuthorsune
    • CommentTimeMar 26th 2007
     
    Why not run your stove system through a radiator or two before the water enters the tank? Thant way you have a heat sink before the tank. That is how I have my system, although the tank is vented. I had my tank made for me by a metal worker - easy.

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