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This boiler guide website does a bit of a comparison with Worcester BOSCH.
When it comes to down to price there’s not a lot in it, but Vaillant do come in a little more expensive than Worcester Bosch. The typical price of a Greenstar 25i by Worcester Bosch falls between £750 – £875 while a comparable Vaillant EcoTec Plus 825 costs approximately £1000 – £1050