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Division 1 The Energy Efficiency Index (EEI) of solid fuel boilers shall be calculated for the preferred fuel and rounded to the nearest integer as:

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Original text. Later amendments are not shown.

EEI = ηson × 100 × BLF – F(1) – F(2) × 100 + F(3) × 100

where:

  1. (a)

    ηson is the seasonal space heating energy efficiency in active mode, calculated as set out in point 4(b) of Annex VIII;

  2. (b)

    BLF is the biomass label factor, which is 1,45 for biomass boilers and 1 for fossil fuel boilers;

  3. (c)

    F(1) accounts for a negative contribution to the energy efficiency index due to adjusted contributions of temperature controls; F(1) = 3;

  4. (d)

    F(2) accounts for a negative contribution to the energy efficiency index by auxiliary electricity consumption, and is calculated as set out in point 4(c) of Annex VIII;

  5. (e)

    F(3) accounts for a positive contribution to the energy efficiency index by the electrical efficiency of solid fuel cogeneration boilers, and is calculated as follows:

    F(3) = 2,5 × ηel,n