Daxom technical guidance. This page brings together Daxom model-specific installation documentation and supporting UK heating-system standards. Installation and commissioning must follow the applicable product manual and be carried out by appropriately qualified professionals.
Find your installation manual
Check the model number on your appliance before selecting a manual. For other models, use the documentation linked from the relevant product page or contact Daxom for the correct manual.
Before installation
- Confirm the appliance model and obtain its applicable installation manual.
- Have a qualified professional check the available electrical supply, property heat loss and hot water demand.
- Check the installation space, pipework and compatibility with the existing heating system.
- Plan system preparation, water treatment and commissioning using the applicable manual.
Electric combi boiler installation guidance
Correct electric combi boiler installation starts with checking the property’s electrical supply, heating demand, hot water requirements and existing wet central-heating system. The boiler must be installed and commissioned in accordance with the relevant Daxom installation manual, current electrical requirements and applicable UK Building Regulations.
Before commissioning, the heating circuit should be properly prepared, cleaned and protected, with system water treatment carried out in line with the requirements described below. Use the model-specific manuals on this page for technical installation instructions, connections, commissioning and operating guidance.
To view installation manual for Daxom Electric Combi Boilers click here > Daxom Combi Boilers Manual
To view installation manual for Daxom Electric Boilers with inbuilt cylinder click here > Daxom Boilers With Inbuilt Cylinder Manual
Primary references: see the UK Government Approved Document L and the BSI information for BS 7593:2019. A copy of the supporting BS 7593 material used on this site is also available here.
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
