My old Vaillant has finally packed in after 10 years and I have been looking for a new boiler. I have been thinking of a Baxi DuoTec 28 Combi Boiler or a Vaillant ecoTec Pro 28 combi boiler. However, lately I have been strongly considering Viessmann Vitodens 200 35kw after hearing good things about it. I also have someone locally who can fit it for a good price and has undergone the Viessmann course so I can have the 5 year guarantee. What would you recommend from the three? Also could you please tell me what the difference is between the Viessmann Vitodens 200 and 100 as I cannot seem to get a straight answer from whoever I ask? Some people just mention that the 200 is an international model with the 100 having some cut backs to reduce the price for the UK market. Is it worth paying the extra £150 or so for the 200 or is there no real difference with the 100? Also online I have read about problems with the old 100. Is this still the case with the new version and are there any reliability problems with the 200? Thanks for any advice.