Graham is the master for Samsung, he has a lot of videos on youtube on how to do stuff with Samsung. I am sure you can change the 3am timer and also  I am sure you can set multiple timers.

I would also recommend a 3rd party overlay which work wonderfully with time of use tariffs and they do everything for you. 

https://www.havenwise.co.uk/

@ashp-bobba 

Many thanks , I contacted Havenwise on my needs  as I acted  on your thoughts , but they said that I would need to contact Samsung as to what I need to go forward . My Gen 5 can be enabled to take a board and then wifi but Samsung are so unhelpful and difficult to get in touch with.

Meantime I will have a look at the video , Thank you.

@alfapat City Plumbing can also supply the Samsung WiFi gateway I believe, if Samsung themselves aren't very helpful.

@alfapat ah sorry to hear that, surprisingly I think Samsung are one of the most popular I unfortunately am not an expert in Samsung controls. 

Best of luck with sorting it out. 

@hcas Hi H, I think joule  are the UK distributer through a lot of merchants for Samsung, @alfapat is it through Joule you are getting info? They supply the merchants if it is the merchant not helping?

https://jouleuk.co.uk/brands/outdoor-units/

@alfapat I found this video where they set more than 1 timer

You will obviously need to put in some off times for your application.;-)

Should hopefully do it 🙂

Posted by: @hcas

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@alfapat City Plumbing can also supply the Samsung WiFi gateway I believe, if Samsung themselves aren't very helpful.

I think there is a local branch , I will look them up , thank you. 

Posted by: @ashp-bobba

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@hcas Hi H, I think joule  are the UK distributer through a lot of merchants for Samsung, @alfapat is it through Joule you are getting info? They supply the merchants if it is the merchant not helping?

https://jouleuk.co.uk/brands/outdoor-units/

no it’s not it just a search of user manuals , being careful not to pay for them ! 
I have put in some DHW time settings with the help of my attached info on gen5 DHW settings , so I will see if they work . I am not sure if I also need to tell the controller of off times as well . At the moment I am working on the premis that on the day hours if the water is at the right storage temps , then there would be no need for the HP to switch on , except that after 12am the system detects that a drop in temperature happens after a bath has been run and I am hoping this new timing set for 4am in the morning negates that , so will see the energy use tomorrow. 
I will visit city plumbing tomorrow. 

Posted by: @alfapat

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Posted by: @ashp-bobba

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@hcas Hi H, I think joule  are the UK distributer through a lot of merchants for Samsung, @alfapat is it through Joule you are getting info? They supply the merchants if it is the merchant not helping?

https://jouleuk.co.uk/brands/outdoor-units/

no it’s not it just a search of user manuals , being careful not to pay for them ! 
I have put in some DHW time settings with the help of my attached info on gen5 DHW settings , so I will see if they work . I am not sure if I also need to tell the controller of off times as well . At the moment I am working on the premis that on the day hours if the water is at the right storage temps , then there would be no need for the HP to switch on , except that after 12am the system detects that a drop in temperature happens after a bath has been run and I am hoping this new timing set for 4am in the morning negates that , so will see the energy use tomorrow. 
I will visit city plumbing tomorrow. 

 Had to put in of times , as it didnt work , however hopefully now with off times to suit Cosy then on times stay where they should be .