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Welcome to the forum. Although you can post in any forum, the USA forum is here in case of local regs or laws

Just been on a Vaillant course. They say that the seal only needs changing if you inspect inside the burner chamber which should be done every 5 years as a minimum. He said that you can change annually if you wish, but there is no need.

View attachment 38024
But why would you not clean the chamber annually? It definitely would extend the lifespan of the boiler. Hard to believe but if you say so then it must be true. It must be down to money making scheme as I can’t get my head around to not service a boiler for 5 years. I will stick to cleaning the chamber annually as I’m fairly confident on extending the lifespan of the boiler as well as making sure the boiler runs perfectly fine.
 
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I’m not saying don’t do it mate. I’m saying that I asked the question and you don’t have to.
 

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