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I have a Vaillant Ecotec 824 combi and the DHW temp maxes out at around 50 degrees even if I turn the DHW temp up to the max of 65 degrees on the controller. Is this normal? I have just put some sentinel X400 in the system to see if this will help.
The boiler is 7/8 years old but the radiators in the house were really old and when I changed them they were full of black water. Could this have clogged the heat exchangers?
The boiler is 7/8 years old but the radiators in the house were really old and when I changed them they were full of black water. Could this have clogged the heat exchangers?