The Energy Information (Household Refrigerators and Freezers) Regulations 2004

2.  The energy efficiency class of an appliance shall be determined in accordance with Table 4.

Table 4

Energy efficiency index: I	Energy efficiency class
I < 55	A
55 ≤ I < 75	B
75 ≤ I < 90	C
90 ≤ I < 100	D
100 ≤ I < 110	E
110 ≤ I < 125	F
125 ≤ I	G

where—

• “energy efficiency index” (expressed as a percentage) = annual energy consumption of appliance in accordance with the harmonised standards / standard annual energy consumption of appliance;

• “standard annual energy consumption of appliance” (expressed in kWh/year) = M × adjusted net volume + N;

• “adjusted net volume” (expressed in litres) = net volume of fresh food compartment + Ω × net volume of frozen food compartment; andthe values of M, N and Ω are taken from Table 5.

  Table 5

  Category of Appliance	Ω	M	N
  (1) For refrigerator/chiller the adjusted volume = net volume of fresh food compartment + Ω × net volume of chiller (10°C) compartment (expressed in litres).
  (2) For ‘no frost’ appliances as defined in the harmonised standards, this index is increased by a provisional factor of 1.2 giving a value of 2.58 (this allows for the possible bias of the measurement method, which does not allow for the lack of ice build-up on “no frost” appliances. In practice, ice build-up will somewhat increase the consumption of “conventional” appliances).
  (3) Adjusted net volume (AV) shall be calculated by the formula: where— “Tc” is design temperature (in °C) of each compartment; “Vc” is the net volume (in litres) of each compartment; and “Fc” is a factor which equals 1.2 for “no frost” compartments and 1 for other compartments.
  (4) For these appliances, the values of M and N shall be determined by the temperature and star rating of the compartment with the lowest temperature, in accordance with Table 6.
  1. Larder fridge	—	0.233	245
  2. Refrigerator/chiller	0.75(1)	0.233	245
  3. Refrigerator no star	1.25	0.233	245
  4. Refrigerator*	1.55	0.643	191
  5. Refrigerator**	1.85	0.450	245
  6. Refrigerator***	2.15	0.657	235
  7. Fridge/freezer*(***)		0.777	303
  8. Upright freezer	2.15(2)	0.472	286
  9. Chest freezer	2.15(2)	0.446	181
  10. Multi-door or other appliances

  Table 6

  Temperature of coldest compartment	Equivalent category	M	N
  >-6c	1 Larder fridge 2 Refrigerator/chiller 3 No-star refrigerator	0.233	245
  ≤ -6°C *	4 Refrigerator (*)	0.643	191
  ≤ -12°C **	5 Refrigerator (**)	0.450	245
  ≤-18°C ***	6 Refrigerator (***)	0.657	235
  ≤-18°C *(***)with freezing capacity	7 Fridge/freezer *(***)	0.777	303