SPONSOR CPD PROGRAMME Continuing professional development (CPD) is the regular maintenance, improvement and broadening of your knowledge and skills, to maintain professional competence. It is a requirement of CIBSE and other professional bodies. This Journal CPD programme can be used to meet your CPD requirements. Study the module and answer the questions on the final page. Each successfully completed module is equivalent to 1.5 hours of CPD. Modules are also available at www.cibsejournal.com/cpd Application of gas-fired boilers and hot water heaters to meet Approved Document L2 2021 Exploring elements of the revised Approved Document L of the England Building Regulations and the impact on fossil-fuelled systems for domestic hot water and space heating in non-dwelling buildings On 15 June 2022, the approved documents (ADs) to the UK Building Regulations for England saw the first significant revisions in almost a decade come into force as a first step along the path towards the UK 2050 net zero target. This CPD will consider elements of Part L of those revised documents focusing on conservation of fuel and power and, specifically, the impact on fossil-fuelled systems to provide domestic hot water (DHW) and space heating in buildings other than dwellings. The UK Government has a target of net zero emissions by 2050,1 with the interim target to reduce emissions in the UK by 78% by 2035, compared with 1990 levels.2 The UK Governments Heat and Buildings Strategy3 notes that to meet net zero will require virtually all heat in buildings to be decarbonised. The ambition is to gradually move away from burning fossil fuels for heating, while increasing the application of low carbon products, fuels and energy sources that it is hoped will be transformed from niche applications to mainstream consumer choices. The recent changes to the ADs supporting the Building Regulations for England included reorganisation and revision of AD Part L Conservation of fuel and power, and AD Part F Ventilation, and the introduction of AD Part O Overheating. By adopting the provisions of these ADs, the aim is to reduce the regulated carbon emissions of new non-domestic buildings by an average of 27% compared with the previous versions. The December 2021 changes to AD Part L Conservation of Fuel and Power has created two volumes. AD Part L volume 1 (replacing ADL1A and ADL1B) relates to dwellings, and volume 2 (replacing ADL2A and ADL2B) to buildings other than dwellings. There is concurrent activity to develop the Building Regulations (and supporting documentation) across the four nations of the UK England (AD Part L), Northern Ireland (Booklet F), Scotland (Section 6) and Wales (AD Part L). This article will focus on the recent revisions for England that particularly relate to the provision of boilers to deliver heating and hot water for non-dwellings, as referenced by ADL2. Unlike previous revisions, the transitional implementation of the revised England documents relate to individual buildings rather than whole developments (that might be, for example, individual office units as part of an industrial estate). So, as of last month, the new provisions apply to all buildings individually unless a building notice or an initial notice has been given to, or full plans have been deposited with, a local authority, in respect of that building, before 15 June 2022, provided that the building work on that building is started before 15 June 2023.3 Fuel type kgCO2.kWh-1 kWhPE.kWh-1 Natural gas 0.210 1.126 LPG 0.241 1.141 Biogas 0.024 1.286 Fuel oil 0.319 1.18 Biomass 0.029 1.037 Grid electricity** 0.154 1.572 ** average of October-March monthly figures provided in NCMMG4 Table 30 Table 1: Examples of carbon factors and PEFs used in UK National Calculation Methodology (for England) www.cibsejournal.com July 2022 49 CIBSE July 22 pp49-52 CPD 199.indd 49 24/06/2022 15:47