# The Boiler (Efficiency) Regulations 1993, Paragraph 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.

---
Source: https://www.legislation.gov.uk/uksi/1993/3083/schedule/7/paragraph/2 (the official version)
Page: https://openlegislation.uk/boiler-efficiency-regulations-1993/schedule-7/paragraph-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.