If you are intending to purchase a Worcester Bosch boiler from eBay ask the seller to provide you with the serial number,if its legit there should be no problem in providing this information, you can then call the Worcester Bosch help line 08457 256 206 to verify the age of the item as the warranty may have already expired due to sitting in someones stock etc. It may even throw up some unexpected results like it has already been fitted and removed again.

Remember this is quite a large investment which could leave you cold and out of pocket.