Soldato
I really wouldn't worry about it! Sounds like you spoke to someone having a bad day.
The burner seal was only an issue on the early models, (made from rubber) which would perish very quickly and allow heat to escape causing damage. For the past few years the seal has been made from graphite and is best left alone apart from a visual check.
But even so, if you keep the servicing up to date, your warranty will cover any faults as long as they are not the result of bad installation or cowboy servicing or misuse.
The burner seal was only an issue on the early models, (made from rubber) which would perish very quickly and allow heat to escape causing damage. For the past few years the seal has been made from graphite and is best left alone apart from a visual check.
But even so, if you keep the servicing up to date, your warranty will cover any faults as long as they are not the result of bad installation or cowboy servicing or misuse.