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Thank you I may try this I was worried about heating starving the HW and visa versa but your suggestion of putting the HW on a timer (early hours then maybe in the afternoon before the heating comes on) is probably a more efficient way of running things.

Just a bit of an update on this drama. It appears the cylinder stat itself if being affected by ambient temperature effect. Was clicking in and out quite regularly and I was wondering where the energy was being wasted. I put some insulating tape around where the very small gap is around the cut...

Thank you Harry no this is just HW alone. The CH isn't on yet. Eeeek!!!

Thank you yes this is the case the boiler (which is a Worcester bosch) does cycle when the HW is on. I.e. the green burner light is on for around 20 mins then off for 10 mins. As mine is taking ages to reach set point obviously this cycling gets increased I guess as the stat temperature setting...

Have attached a pic of what stat i am using sorry has posted twice.

Thank you for this info. All that has physically changed is the HW valve replaced. I then tinkered with the thermostat setting on the cylinder. I don't appear to have hot water entering the cold water system at least not that I am noticing. Does the stat plate on the back of the sensor...

I need to try this too. I do think that the chalk in the cylinder is causing half these issues. I am in Kent and it's renowned for very chalky water so 25 to 30 year old cylinder is going to be an issue. Really I need to get it changed but they cost a fortune but then I need to weigh up the cost...

This is my concern I think that it's full of scale so it will take ages for the heat to transmit through the cylinder wall to the stat. Where i have messed around with the stat setting its maybe thrown it out of calibration. In an ideal world i probably need a new cylinder but this is just what...

Really hoping you good people can help. My set up is a standard vented HW and CH system. The other evening my HW failed (made known by Daughter moaning how cold the shower was). The cylinder thermostat is a really old Honeywell type so I used a screwdriver to move the dial down to see if it...

I know this is an old post and you may not see this but was it sorted? Only that my system is doing pretty much the same. Thanks in advance.