BS 7593:2019 is the new British Standard Institutes code of practice that was introduced 31 May 2019 for preparation, commissioning and maintenance of domestic central heating and cooling water systems.
It applies to individual domestic premises when commissioning a new system for the first time on a new build, or re-commissioning following the installation of a new boiler, or any remedial work.


The British Standard Institute has been listening to evidence from the industry and customers about how the industry is managed. A high proportion of boilers that fail in the first year (which should never happen) do so because of poor water quality. By introducing regular testing and re-dosing, proper (and regular) system cleaning, and the mandatory installation of an in-line filter to the industry’s code of practice, we can now improve the efficiency and life expectancy of every household heating system.