Range from the cheapest Boiler service £50 (KPS Plumbing & Heating Ltd based in BS16) to the dearest Boiler service £110 (Smiths services (plumbing-heating-water) based in BS31).
Comparing heating engineers estimates for a Boiler service 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 for a boiler service by posting your job to heating engineers in BS8