Division (b) From 26 September 2017 the water heating energy efficiency of water heaters shall not fall below the following values:
United Kingdom
| Declared load profile | 3XS | XXS | XS | S | M | L | XL | XXL | 3XL | 4XL |
|---|---|---|---|---|---|---|---|---|---|---|
| Water heating energy efficiency | 32 % | 32 % | 32 % | 32 % | 36 % | 37 % | 37 % | 37 % | 37 % | 38 % |
| In addition, for water heaters with smart being declared as ‘1’: water heating energy efficiency calculated for smart = 0, tested under the declared load profile | 29 % | 29 % | 29 % | 29 % | 33 % | 34 % | 35 % | 36 % | 36 % | 36 % |