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Problem with central heating header tank?

Ever since we had a service on our heating we seem to get hot water coming up into the header tank from time to time. Is this okay - should this happen?
Dave, October 2010
yes as heat rises the header tank warms as it feeds water which becomes hot

kash, October 2010
check that the pump setting is not to high eg 1 is low 3 is high. set it on 1 see if it inproves. if not you need to balance the rads

piper, October 2010