Range from the cheapest fitting of a boiler magnetic filter £50 (Robin Greenfield based in HP10) to the dearest fitting of a boiler magnetic filter £180 (Local Plumbers (London) Limited based in SL9).
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 HP15 by posting a job with HaMuch and we will send it to heating engineers in HP15.