Should You fit a filter on your boiler?
The purpose of filters such as MagnaCleans is to rid your central heating system of iron oxide sludge (rust) that has built up over the years in the inside of pipes and radiators of your heating system.
You should not fit a new boiler without fitting one of these magnet type of filters as any sludge still in the system will circulate around your boiler causing poor performance and damage to inner parts.
Always Flush Your System when fitting a New Boiler
A pre requisite is of course to have your existing heating system chemically or mechanically flushed. Failure to do so WILL invalidate your boiler warranty with many companies.
Indeed, many manufacturers do test the system water for sludge prior to undertaking warranty repairs.
If a dirty system is found to be the cause of the problem, you may get charged extra or suffer the refusal of service.
The MagnaClean (filter) does help the system stay clean and will extend the life of your boiler.
Cost Of A Filter
At the time of writing ( Feb 2018 ) you can purchase cleaners for £60-£100 and perhaps pay around £40 for professional fitting. These should be fitted to the return of your pipework.
Please remember to clean out regularly, at least once a year.
A small price to pay to protect your £2000 boiler.