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So, we're having our boiler replaced in about a week. We have a WM VHE-5 Series 2, going by the CP# it was manufactured in 1983. We've only owned this house for about 4 years now, and last winter was the first time we had any issues with it. Anyway...
I had to remove a nasty old shower stall in the corner of the basement to make room for the new unit and associated near-boiler piping, and have been dismantling a few things on the old boiler just to satisfy my own curiosity.
I know this unit has the secondary heat exchanger on it, and I removed the cover to take a look...I also noted some cracks and splits on the welds where the tubing enters and leaves the collector box. And look at those boiler sections! Yum. Time for it to go!
Just thought I'd post these for you folks out there who take an interest in such things. I know I find it interesting. And no, this unit was never piped right from the beginning.