The Boiler (Efficiency) Regulations 1993 No. 3083

Regulation 10

SCHEDULE 7 LABELLING INDICATING ENERGY PERFORMANCE

Part I

1.  If the efficiency of a boiler at rated output and its efficiency at part load are equal to or greater than the relevant values for standard boilers, the boiler may be labelled with a single star as set out in Part II of this Schedule.

2.  If the efficiency of a boiler at rated output and its efficiency at part load are three or more points higher than the relevant value for standard boilers, the boiler may be labelled with two stars as set out in Part III of this Schedule.

3.  Every extra step of efficiency of three points at rated output and at part load will allow the attribution of an extra star as set out in Part III of this Schedule.

Part II The energy performance label awarded under regulation 10 consists of the following symbol:

Part III Efficiency requirements to be met both at nominal output and at part load 0.3 Pn

Label	Efficiency requirement at nominal output Pn and at an average boiler-water temperature of 70°C %	Efficiency requirement at part load of 0.3 Pn and at an average boiler-water temperature of ≥50°C %
★	≥84 + 2 log Pn	≥80 + 3 log Pn
★★	≥87 + 2 log Pn	≥83 + 3 log Pn
★★★	≥90 + 2 log Pn	≥86 + 3 log Pn
★★★★	≥93 + 2 log Pn	≥89 + 3 log Pn