I'm currently experiencing some problems getting hot water. I have an 's' plan indirect system (2 x 2 port valves), my mrs said the hot water got slightly better when she turned up the room stat and the stat on the boiler, although as i understand it, this shouldnt have any effect on the hot water, either way its not working at all now anyway (and to top it all off the immersions been knackered for a while now, so i'm gonna change that when i get this sorted). I have checked both the 2 port valves and they are piping hot in both directions when calling for heat from the time clock, the pumps running and the cylinder stat was set to 70'c (i believe this is too high anyway) but no heat is coming from the draw off on the top of the cylinder, I'm capable of changing any parts if need be but just a bit stuck as to what it might be. Possibly the cylinder stat is knackered? any help would be appreciated. Cheers