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If you dont fit the included filter with a Baxi 800 it takes the 10 year warranty to 2 but the 600 with a 7 year warranty doesn't require one and they are the same boiler although another thing they are starting to do is pull water tests into it with the system and using that to get out of repairing them, the next few years are going to be fun to see what goal posts they change.
Yeah they are fuckers like that.
Warranty is probably worth fuck all as well.
No two installers will agree on what installation specs will actually create a valid warranty too. One of them was like 'if you don't fit a magnetic woo box on the inlet no warranty for you!'