Division (a) From 26 September 2015 the water heating energy efficiency of combination 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 | 22 % | 23 % | 26 % | 26 % | 30 % | 30 % | 30 % | 32 % | 32 % | 32 % |