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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

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    • CommentAuthorScotch
    • CommentTimeJul 23rd 2013
    Hi all,
    I have a Vigas 25 and 1500l thermal store.
    The thermal store temperature never gets above 80 degrees. A friend of mine has a 25kw Eco Angus which heats his thermal store to 90 degrees.
    Is there a setting within the menu that I can adjust to increase the temperature?

    The thinking is that I may get an extra day between firings at this time of year.

    • CommentAuthorfinny
    • CommentTimeJul 23rd 2013
    Hey Scotch,
    probably a different thermostat cartridge in your mates laddomat or similar loading valve.. You can swap it out for a higher temp one..yours could be a 78 degree unit?
    • CommentAuthorfinny
    • CommentTimeJul 23rd 2013
    or sounds more like a 72 degree one thinking about it..
    • CommentAuthorbillt
    • CommentTimeJul 23rd 2013
    It won't be the Laddomat. That just controls the temperature that the store loads at. Once the whole store is at that temperature, the store temperature will continue to rise as long as the boiler is dumping energy into it.

    I would look for a boiler thermostat of some sort. My Atmos has a fan thermostat and an air intake thermostat.

    Look at page 10 section 4.2 of http://vigasboilers.com/wp-content/themes/vigasboilers/pdfs/Vigas%20Manual%20Feb%202010.pdf. That tells you how to change the boiler water temperature of a Vigas with AK3000 controleer.
    • CommentAuthorScotch
    • CommentTimeJul 26th 2013
    Hi billt,
    Is actually a AK2000, but I found a setting called "Heating Temp". I changed this from 78 to 85, which was its max. The default display now shows 85, so next time I do a burn we will see what happens.

    • CommentAuthorScotch
    • CommentTimeAug 13th 2013
    Well that seems to have worked, the store now gets to 90 degrees and I am getting an extra day between burns.

    • CommentAuthortony
    • CommentTimeAug 13th 2013
    Sadly also maximising your heat losses
    • CommentAuthorskyewright
    • CommentTimeAug 13th 2013 edited
    Posted By: tonySadly also maximising your heat losses

    But unless I'm misunderstanding that's just more rapid heat loss on heat he wasn't previously able to store (i.e. previously lost). The same amount of wood has been burnt in both cases hasn't it? When the store gets down to 80 degrees he's back to the heat loss situation he had before, but he's gained whatever time that has taken since the burn. So that's a win isn't it?

    Maybe we're just looking at the same thing from glass half full & glass half empty points of view?
    • CommentAuthortony
    • CommentTimeAug 13th 2013
    No, the hotter the store the more heat it looses. Unless that heat loss can be utilised then it is wasted and introduces inefficiencies, these are also present in the hot primary loop.

    I store hot water at 50C as do most of the population of North America giving rare brownie points for energy use reduction.
    Tony, I assume you have a traditional DHW tank rather than a TS type setup?

    Just had a long meeting with our plumber and this issue came up. He is advising the vented route with our TS and smaller DHW tank and use of flat plate heat exchanger on smaller tank to provide mains pressure DHW but my concern is that the tank would need high 60s-70s to get nice hot water for showers. Will only be the smaller tank rather than the 1000l TS but still seems higher than you could get away with if we were using the water directly rather than through a heat exchanger. So many options!
    • CommentAuthortony
    • CommentTimeAug 13th 2013
    Yes I have a traditional dhw cylinder all be it 4x spray insulated with a solar coil.
    • CommentAuthorjms452
    • CommentTimeAug 16th 2013
    This is a hard one.

    Tony's point about heat loss is correct but is only part of the picture (unless you were to use an immersion heater).

    Running less frequently there are less transient inefficiencies starting up the boiler and less instances of hot water left in the pipes.

    There is also another downside as the boiler efficiency is probably lower for the last part of the burn when heating the water to 90 rather than 80.

    I think it go either way depending on the distance boiler characteristics and distance from boiler to thermal store.

    If you really want to tie yourself in knots try considering if a bigger thermal store at a lower temperature is 'better' (even this doesn't have a simple answer).:devil:
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