Product manual shows how to set ECO pro:
http://www.vaillant.co.uk/stepone2/data/downloads/2f/44/00/ecoTEC%20pro%20operate.pdf
The unit can also be wired to separate timer.
This timer might be one of following timers shown on link below, with possible manual for each.
http://waterheatertimer.org/Woods-timers-and-manuals.html#Remeha
Live answer 11-24-12.
Add a comment and describe timer buttons and detail, and post photo on flick and send link to photo for clear identification of product.
If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7
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