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Biomass boilers and thermal stores....

Discussion in 'Plumbing and Central Heating' started by jason61c, 8 Nov 2014.

  1. jason61c

    jason61c

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    Right, I'm going to have a biomass boiler fitted. Going for one of the Effecta range.

    What I can't work out, is it best to have a thermal store that is then pumped to a separate DHW cylinder for mains pressure, or a tank with a stainless heat exchanger fitted?

    Looking at 1000-1500ltrs store on a 25kw pellet boiler.

    Its a bit of a head scratch working out what the best way of running this type of system is!

    Any other ideas or thoughts?
     
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  3. Biggles..

    Biggles..

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    Are you confusing a buffer with a thermal store?
     
  4. jason61c

    jason61c

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    Its mixed terminology really. I understand what you're saying and have been looking into both!
     
  5. Biggles..

    Biggles..

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    Why would you use a thermal store then a DHW cylinder as both produce DHW????

    For biomas your trying to achieve load leveling therefore it's a buffer, if you'd have looked at windhager ( not my favourite by any means) they don't require a buffer on some of their systems.
     
  6. dcawkwell

    dcawkwell

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    Had my biomass boiler installed for free. :)

    The reason the biomass comes with the thermal store is the run up time.
    Assuming starting from cold it could well take the biomass boiler 30 minutes to get producing any real useful heat or that is what it seems like with mine.

    I would say if you have the space go for a separate unvented cylinder.
    You also have the backup of immersion.

    Biomass doesn't look to be good at going on and off lots of times a day.
     
  7. Corgigrouch

    Corgigrouch

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    As Dcawkwell has already said, if you have space for a cylinder then that would be a better option as you have the electric back up... If not then a plate heat exchanger can provide a pretty high flow too... It's pretty much down to what you prefer and have space for..
     
  8. Biggles..

    Biggles..

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    Have fitted loads to buffers and the out to space heating/DHW or plates.
    Not yet gutted one to a thermal store.
     
  9. Norcon

    Norcon

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    These are my thoughts...
    10 things your installer won’t tell you about your pellet biomass boiler before you buy it....

    1.We may overspec or underspec your boiler.

    2.The biomass boiler will likely breakdown frequently.

    3.The boiler will require “considerable more time and effort to ensure it runs efficiently and gives long service” compared to a gas boiler or oil boiler.

    4.The weekly checks and clean-outs you are required to carry out will not prevent breakdowns from occurring.

    5.When your boiler does breakdown, your building will be without heating for more than a few hours because we don’t have an engineer in your area.

    6.When things go wrong – and they will – we will blame it on the quality of the fuel you have purchased to burn in the boiler, not the quality of the boiler and parts.

    7.The electrical items on your boiler, only have a 12 month guarantee on them but some, such as the heat gun, will likely fail frequently.

    8.The service contract is very expensive because we know you will need to call us out a lot.

    9.Because the boiler will likely be manufactured abroad, we will not feel the same sense of responsibility to put things right as we would if we were the maker.

    10.When you decide it really does not make sense to keep throwing good money after bad, we will not buy back/sell on the biomass boiler for you.

    Finally why do you think you need thermal storage/buffer/ accumulator tank with a pellet boiler?
    Does the manufacturer recommend one?

    And remember to keep a stock of woolly jumpers on stand by for when it breaks down.
    And most importantly research the brand you are considering and SPEAK to someone who owns one to find out exactly what your letting yourself in for.
     
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  11. jason61c

    jason61c

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    Well done for copying a post off the internet. Do you really think its any help at all or that copying a webpage into here means anyone will take your post seriously?
     
  12. Norcon

    Norcon

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  13. jason61c

    jason61c

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    As you're such a smart guy you'll know that its not getting rid of cash, in my case its getting 3x my investment back over 7 years through the RHI.

    Do you have anything sensible to add or just preconceptions? I guess you know lots about them?
     
  14. Richardthe3rd

    Richardthe3rd

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    With buffers, we'd always fit SS plate heat exchangers for hot water.
     
  15. Richardthe3rd

    Richardthe3rd

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    I & the rest of the British tax payers paid for that, I hope you're proud of yourself!!! Lines of people outside Food Banks & you are scrounging like that?
    Poetic justice when it falls to bits in a couple of years......😀😀
     
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  16. jason61c

    jason61c

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    You could argue that we're just getting some of the tax back we've paid over the years.

    With a 5 year warranty there's not much to worry about.
     
  17. Corgigrouch

    Corgigrouch

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    Lee, was reading between the lines and figured that he would be getting a Buffer.... If his installer was fitting him a therml store then he would know where his DHW was coming from..
     
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