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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!'
Howard-
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.
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The warranty reqs for our boiler install were pretty clear in the boiler installation manual - various water checks carried out by accredited installer and a full flush of the system with a big magnetic filter on the CH return to (ostensibly) catch rust off the inside of shitty radiators. And an annual service. Takes it to 10 years on our Vaillant.
konastab01
Dramatic_Hammer
The 5 or so year warranty of the boiler manufacturer is conditional on yearly check ups