Just wondering if anyone else here is finding an enormous amount of these heat exchangers cracking in the upper flue passages? If so, what about G8's, 12's and 16's? I'm beginning to be concerned about all Duracurve models now, especially since it wasn't long ago that I thoought these heat exchangers were extremely durable. I've only recently condemned alot these G20 heat exchangers and was wondering if others were finding the same trend?

Thx in advance for any feedback. Any help is a big help!