# The Boiler (Efficiency) Regulations 1993, 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

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