Hi,I have a Vaillant 831 ecotec+ with the manual timer clock fitted to the boiler ,the boiler is in the upstairs airing cupboard and the manual room stat downstairs.My question is it possible to upgrade the room stat to a programmable timer .Because every time i need to alter the timer clock i have to fight my way into the airing cupbord would be a lot easier if i could control things from downstairs!! .Many thanks