In article ,
Jerry. wrote:
Sorry, but how is a corroded rad anything to do with what the plumber
did, I'm no fan of them, but I really do fail to see the connection !
All steel components are at risk, they were before the plumber even knew
of you, and they would have been at risk even if the plumber had not
touched the pump.

An open heating system, done correctly, will use very little water -
indeed Servowarm didn't supply any cold water feed to the header tank, you
just topped it up every few years. So there's no air in the water, and
without oxygen, steel can't corrode. But if you allow the system to pump
over, this aerates the water and *will* cause corrosion.

--
*If at first you don't succeed, try management *

Dave Plowman London SW 12
RIP Acorn