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hot water not hot when c/h is on

Posted: Fri Oct 31, 2008 7:05 pm
by robbo77
in a morning set my water and heating to come on,when c/h is not on water is hot,but when both c/h and water on together the water is not very warm,also when i just have hot water on my rads upstairs become warm.does anyone have any ideas on this.
cheers

Posted: Fri Oct 31, 2008 11:46 pm
by plumbbob
It all depends on system type, boiler size and type.