Replace control unit with Nest

[New Used]

Hello,

I have a LOGIC a combo Esp1 35 boiler and CM707 control unit.

I want to install Nest - however from looking online the two inputs are 240v from the boiler (cables are thick).

Were it not for the voltage it looks a simple job. How can I do this myself ? Thanks

 

[Deleted member 120897]

It should be simple enough and use existing wiring. Which Nest? You may need to use the usb cable that comes with it.