rad valves are around £5 for the bog standard ones. I'd expect to pay about £25 to £35 for each radiator depending on the type of system you have. If it's a sealed (pressurised) system I'd say that should be cheaper than if it's an open system (with a header tank in the loft) due to the time taken to refill the system and clear air from it.
Ian
October 2011
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