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Hi can anyone help when the hot water and heating come on in the morning the rads wont heat up untill the water is hot and this happens any time it needs to heat the water. i,ve got a Y system the 3 way valve is new the pump is ok when its calling for water and heating the valve is in the mid...

Hi I've got a potterton promax 24/2 HE puls boiler its was fitted about 3 years ago never had any problems with it but the rads have never been boiling hot but they are hot (wife would like them hotter) so i adjusted the flow temperature adjustment screw but this made the heating make loads...