Range from the cheapest replacement of a header tank £121 (Paul Russell based in SS1) to the dearest replacement of a header tank £451 (City build.com based in Ss5).
Comparing plumbers estimates for replacing an expansion header water tank for your central heating 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 replace a header tank in SS8 by posting a job with HaMuch and we will send it to plumbers in SS8.