04/09/2022
A word about Regulations
UK Building Regulations, Part L – Conservation of Fuel and Power, has recently been updated to cut CO2 emissions from our homes.
Here’s everything you need to know about how to comply with BS7593:2019 and therefore the updated Part L.
Changes to Part L coming into force on 15th June 2022 mean that water quality checking, maintenance and protection will need to be carried out at every heating system install, service and repair. Essentially, when working on, preparing or commissioning a heating system – NEW OR EXISTING – the heating system water needs to be treated as per BS7593:2019.
What is BS 7593:2019?
It’s the British Standard code of practice for the preparation, commissioning and maintenance of domestic central heating and cooling water systems.
It applies to individual domestic premises when commissioning a system for the first time on a new build, or re-commissioning following the installation of a new boiler, or any other major remedial work. It’s not just about boilers. The guidance includes individual heating circuits within blocks of flats, heat interface units (HIU) and wet cooling systems too.
When does it come into force?
This Code of Practice came into effect on 31 May 2019, replacing the version published in 2006. BS 7593 is a regulatory requirement within Building Regulations, Part L.
Why are the regulations changing?
The British Standards Institute has been listening to evidence from the industry to ensure its guidance is fit for purpose.
More is now understood about effective water treatment for today’s appliances and the steps that can be taken to minimise the negative impacts of corrosion. The changes acknowledge that chemical water treatment isn’t a fit and forget solution, and magnetic filters shouldn’t just be considered a nice to have.
A high proportion of boilers that fail in the first year do so because of poor water quality. By introducing regular testing and re-dosing, proper system cleaning and the mandatory installation of an in-line filter to the industry’s code of practice, we can significantly improve the efficiency and life expectancy of every household system.
BS 7593:2019 – A summary
The revised standard now includes the following key changes for those specifying, installing and maintaining domestic heating and cooling systems.
For the first time, the fitting of a permanent in-line filter is required in addition to a chemical clean and fresh water flush before inhibitor is added
An in-line filter should be fitted to ALL systems
All recommended cleaning methodologies can be improved with external magnetite capture equipment and mechanical vibration of radiators
An on-site water test is required to test the level of inhibitor and cleanliness of the system every year
Inhibitor should be re-dosed every five-years or a full system water test undertaken
BS 7593:2019 is now applicable to both closed loop heating and cooling circuits
Biocide is required in cooling and low temperature heating systems, and should be considered for higher temperature systems for added protection during downtime
