BG 29/2021 takes into consideration various feedback received by the users of the previous version, published in April 2020. 

This amended version, always developed in partnership with the Closed Systems Control Association (CSCA) and an industry steering group, include changes such as:

• Minor amendments to the system schematics and associated notes

• Additional flexibility with respect to laboratory test methods

• Clarification regarding systems with corrosion monitoring

• Revised guidance regarding air venting at terminal units

• Revised guidance regarding circulation

• Revised guidance regarding heating to improve cleaning effectiveness

• Revised guidance regarding temporary pumps

• Expanded guidance to cover a wider range of non-UK guidelines

The guide is available to download from the BSRIA bookshop.