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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.
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