I have decided to choose the Viessmann 100 vitoden compact boilerThe main consequence of manufacture date is the warrantee.
But I think you will find that boiler is a Band B which were not normally permitted to be installed after October 2010.
That may explain why its for sale cheap.
Its also less less efficient than the currently required Band A boilers.
Tony
or vaillant ecotec 428 conventional condensing boiler, which boiler would you pick????? thanks