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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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Building Regulations and Standards: Biomass Stoves Efficiency - Part L

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  1.  
    • CommentAuthorTomN
    • CommentTimeSep 11th 2008
     
    Does Part L's "84%" minimum boiler efficiency apply to biomass stoves as well?

    I'm looking at one that's 81% efficient but can find anything in Part L that mentions any distinction between boiler types.

    Anyone have any experience in this?
    • CommentAuthortony
    • CommentTimeSep 12th 2008
     
    No! you might be the first, which in itself is worrying.
  3.  
    Boiler types are specified in the SAP software used for compliance though I'm not sure if the database included Biomass
    •  
      CommentAuthorted
    • CommentTimeSep 12th 2008
     
    Have you checked the Domestic Heating Compliance Guide published by the ODPM (as was) May 2006. This has a section on solid fuel including minimum efficiency % for a range of different fires, stoves and boiler types. The minimum figure quoted for an auto-feed pellet stove is 65%.

    http://www.planningportal.gov.uk/uploads/br/BR_PDF_PTL_DOMHEAT.pdf

    There is also the HETAS Official Guide to Solid Fuel Products and Services - http://www.hetas.co.uk/public/hetas_guide.html = which says in Part 1:

    UK Building Regulations require that if a solid fuel burning appliance is to be installed it must have an efficiency which meets minimum levels. These levels are the same as those required for HETAS Approval and are given in Section 6 of the Introductory Notes at the front of this Guide. Further, if burning the same fuel, the replacement appliance must have an efficiency no more than 2 efficiency points less than the appliance it replaces. If the replacement appliance burns a different fuel, then a calculation based on relative carbon emissions is applied.

    You should find all the info you need in there somewhere.
    •  
      CommentAuthorted
    • CommentTimeSep 12th 2008
     
    Here's the bit from the HETAS Introductory Notes:

    HETAS APPROVED APPLIANCES MINIMUM EFFICIENCY STANDARDS

    OPEN FIRES
    Simple Open Fire – 37% (Radiation only)
    Open Fire Freestanding Convector – 47%
    Open Fire Inset Convector – 45% mineral fuel, 43% wood
    Open Fire with domestic hot water boiler - 50%
    Open Fire with high output boiler – Trapezium grate – 63%
    Open Fire with high output boiler – Rectangular grate - 65%

    Notes. The standard test fuel used for open fires is a low temperature reactive coke.
    Additionally, heat is given out from the appliance by convection and conduction which provides added heat to that measured in the earlier BS tests
    on which these minimum figures are based.

    ROOMHEATERS/STOVES
    Roomheater without boiler – 65%
    Roomheater with boiler – 67%
    Note. The standard test fuel for Roomheaters is an anthracite based briquette.

    COOKERS
    Cooker with integral oven and boiler – 50%
    Cooker with independent oven and boiler – 60%
    Notes. The test fuel for cookers is an anthracite based briquette.
    Additionally, heat is given out from the cooker which has not been included in these minimum efficiency figures but which in colder weather
    produces additional useful heat.

    INDEPENDENT BOILERS
    Hand Fired – 65%
    Note. The test fuel for hand fired independent boilers is an anthracite based briquette.
    Gravity Feed (up to 20.5 kW) – 70%
    Gravity Feed (above 20.5 kW) – 75%
    Note. The test fuel for Gravity Feed boilers is a grain or bean sized low ash content anthracite.

    PELLET FIRED STOVES
    Pellet Fired Stoves – 75% nett (at nominal load)
    70% nett (at part load)
    Note. The test fuel for pellet fired appliances is a low ash content high quality wood pellet

    The official HETAS test figures for a whole range of models is listed in Part 1.
    • CommentAuthorTomN
    • CommentTimeSep 15th 2008
     
    Excellent response guys!

    Thanks

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