Worcester 350 hot water problems?

Flushed out the heat ex with drain cleaner solution and now working perfectly. Thanks for help.

allan
October 2010

most likely a blocked heat exchanger as the water flows through it warms up but when it blocked water flows through faster but boiler water flows through slower and less so water doesnt heat up as fast ideally u need to fit a iron oxide collector as this blocks the boiler ie boiler buddy or magnatec

kash
September 2010