ANNEX IXSupplementary provisions
ANNEX IX Method for calculating the Energy Efficiency Index 1. The Energy Efficiency Index ( EEI ) of solid fuel boilers shall be calculated for the preferred fuel and rounded to the nearest integer as: EEI = η son × 100 × BLF – F(1) – F(2) × 100 + F(3) × 100 where: (a) η son is the seasonal space heating energy efficiency in active mode, calculated as set out in point 4(b) of Annex VIII; (b) BLF is the biomass label factor, which is 1,45 for biomass boilers and 1 for fossil fuel boilers; (c) F(1) accounts for a negative contribution to the energy efficiency index due to adjusted contributions of temperature controls; F(1) = 3; (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; (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 × η el,n 2. The Energy Efficiency Index ( EEI ) of packages of a solid fuel boiler, supplementary heaters, temperature controls and solar devices shall determined in accordance with point 2 of Annex IV.