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vaillant 280e no constant hot water...radiator heat is fine?

i have a vaillant 280 heating system that will not produce hot water..it is fine at first for few seconds then nothing but luke warm water. heating in house is perfectly fine and no loss of water pressure...what is wrong
chad lyons, December 2009
I suspect you will need to replace DHW exchanger

Steve, March 2010
link Click here to see other fixes for Vaillant.