Division 2 ENERGY EFFICIENCY CLASSES OF HOT WATER STORAGE TANKS

United Kingdom

The energy efficiency class of a hot water storage tank shall be determined on the basis of its standing loss as set out in Table 2.

Table 2

Energy efficiency classes of hot water storage tanks

Energy efficiency class	Standing loss S in Watts, with storage volume V in litres
A+	$S < 5,5 + 3,16 \times V^{0,4}$
A	$5,5 + 3,16 \times V^{0,4} \leq S < 8,5 + 4,25 \times V^{0,4}$
B	$8,5 + 4,25 \times V^{0,4} \leq S < 12 + 5,93 \times V^{0,4}$
C	$12 + 5,93 \times V^{0,4} \leq S < 16,66 + 8,33 \times V^{0,4}$
D	$16,66 + 8,33 \times V^{0,4} \leq S < 21 + 10,33 \times V^{0,4}$
E	$21 + 10,33 \times V^{0,4} \leq S < 26 + 13,66 \times V^{0,4}$
F	$26 + 13,66 \times V^{0,4} \leq S < 31 + 16,66 \times V^{0,4}$
G	$S > 31 + 16,66 \times V^{0,4}$