Warm water, not hot

[gentess1]

Oldish Worchester boiler, had problem with water supply, since then I have limited warm water ( not hot ) If I put the heating on ( that is okay ), we get moderate warm water. I have had the diverter valve replaced, but getting worse. Could the repairs to my water supply, and muck in the supply caused the problem, or is my boiler cream crackered. Just seems very fishy that everything was okay till then. The boiler is firing on demand, and heating is good? just need hot water

Thanks in anticipation

 

[corgiman]

yes i could be the back to back heat exhcnager

 

[gentess1]

What the heat exchanger is slowly giving up the ghost, so why is my heating piping hot?, I imagine changing the HE is time consuming and costly, I maybe better advised to look at updating it. Is the CD24 an old model? plus I could do with some more ummffff, 3 bed bungalow, only made for 1 bed flat??