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A description of the principle's of weather compensated heating:

http://www.telegraph.co.uk/earth/329812 ... lanet.html


A guide from Viessmann:

http://www.viessmann.co.uk/downloads/CondensingTechnology.pdf


A set up manual from Viallant:

http://www.vaillant.co.uk/stepone2/data/downloads/b2/42/00/VRC_400_Installation_and_user_guide.pdf