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Advice really appreciated on hot water temperature

View the thread, titled "Advice really appreciated on hot water temperature" which is posted in Bathroom Advice on UK Plumbers Forums.

Hello people in the know! I have just moved into a new house. It is a system I am not used to as my previous home had a combi boiler. So, there is a large blue hot water cylinder in the airing cupboard and the dial on the front is set to 65. There is a Valiant Ecotec 418 Boiler in the kitchen and the water dial is set to 65 (it doesn't go higher than this).
I have the water set on a timer to come on at 5pm for one hour.
It just doesn't seem hot enough. So . . . can I turn up the temperature on the front of the blue hot water cylinder or is it governed by the 65 setting on the boiler. Also, how long should the water stay hot for? The system was installed by the previous owner in 2014.
Many thanks for any advice you can give. All the best Jan
 
Yayyy - I have roasting hot water. So I am guessing my boiler temps (CH &HW) need to be 10 degrees higher than my HWcylinder temp - thank you x
If the boiler temperature is lower than HW stat you will never desired hot water temperature, that’s how these things work. It’s thermal equilibrium
 

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