Range from the cheapest fitting of a boiler magnetic filter £40 (Colin Williams based in GL50) to the dearest fitting of a boiler magnetic filter £170 (Ongas based in GL5).
Comparing heating engineers estimates for fitting a magnetic filter gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
What to do - Get rates and quotes to connect a magnetic filter in GL3 by posting a job with HaMuch and we will send it to heating engineers in GL3.