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Thanks for your reply OCAperson, I've just had a look and we have valves that require a spanner, there is a square tip to the spindle and nowhere unscrew with a screwdriver. Do you think we can keep these or should we replace, they also act as a reducer going from the pump down to 22mm. I...

Thanks for the reply, looks like we'll be draining the system, is it worth replacing the isolation valves while we're at it.

Hi, We've presently got a Myson Compact CP53 pump and it's started to sound a bit rough and get very hot, the rest of the central heating system's fine and only 7 years old. Before it dies on us I'll like to replace it. Could you please let me know if the Grundfos Selectric Bare 15-50 130mm...