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<p>The 2018 uplifts to boiler installation standards were made through an amendment
to the 2018 Building Regulations. Compliance with Building Regulations is enforced
by Building Control.</p><p>Compliance with Energy-related Products (ErP) standards
is carried out by Notified Bodies, as defined by EU Directive 92/42/EEC: Hot Water
Boilers. A list of Notifying Bodies can be found at the following URL: <a href="https://eur02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fec.europa.eu%2Fgrowth%2Ftools-databases%2Fnando%2Findex.cfm%3Ffuseaction%3Ddirective.print%26refe_cd%3D92%252F42%252FEEC&data=02%7C01%7CRosalyn.Tandy%40beis.gov.uk%7C6619f9a1216a41569f5d08d6e8c8cd56%7Ccbac700502c143ebb497e6492d1b2dd8%7C0%7C0%7C636952346463943182&sdata=gssTJ8R70WjIZLq8bys1I8226ZrXkxW4OvQngs%2BMl1Y%3D&reserved=0"
target="_blank">http://ec.europa.eu/growth/tools-databases/nando/index.cfm?fuseaction=directive.print&refe_cd=92%2F42%2FEEC</a></p><p>In
response to his question on the percentage of boilers sold after the introduction
of the current standards, I refer the hon. Member to the answer I gave him on 24th
May 2019 to Question <a href="https://www.parliament.uk/business/publications/written-questions-answers-statements/written-question/Commons/2019-05-16/255264/"
target="_blank">255264</a>.</p><p>The details of the research carried out on real-world
boiler performance are available here:</p><p><a href="https://www.bre.co.uk/sap2012/page.jsp?id=2768"
target="_blank">https://www.bre.co.uk/sap2012/page.jsp?id=2768</a></p><p><a href="https://www.bre.co.uk/sap2012/page.jsp?id=2767"
target="_blank">https://www.bre.co.uk/sap2012/page.jsp?id=2767</a></p><p><a href="https://www.bre.co.uk/sap2016/page.jsp?id=3619"
target="_blank">https://www.bre.co.uk/sap2016/page.jsp?id=3619</a></p><p>Boilers operate
within a household heating system comprising pumps, pipes, emitters and controls.
The efficient operation of the system depends on the proper sizing, positioning and
maintenance of these components to ensure how water is distributed as it should around
the building. The heating system has a dynamic relationship with the fabric of the
building such that efficiency is also affected by the level of insulation, ventilation,
the extent to which doors and windows are kept open, and ambient heat from other household
systems. Performance is also affected by the manner in which the consumer makes use
of timers, thermostats and individual radiator controls, and by variation in gas content.</p><p>Boiler
efficiency must be measured under test conditions to ensure comparability between
products. There are too many variables in situ, as described above, to allow fair
comparability.</p>
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