Many apologies for resurrecting this post!
A question for the OP, I have started to strip down and service an oldish 62M that I have acquired. I find that on the bottom of the burner pot on the inside it appears as if the metal has been coated with some material that I can only think of as been some kind of fire cement. The surface looking like that of a dried paste having been spread. Similarly on the bottom on the outside of the burner pot base is another form of dried paste which is only around the middle of the domed base. Was material like this ever used or has it been 'bodged' possibly?. I would doubt that the unit has ever been stripped as the outside rivets looked original though inside on the inner case / burner pot the fixings were self tappers!
The burner rings are both one piece units with the top one being quite light weight and not heavy as implied in your post as being cast iron. The lower ring seems to be stainless!
I also seem to have a fixed baffle that sheilds the flue exit from the flame of the burner pot. This seems to not be the same as your heater, do you have such a baffle?
I don't have a catalyser though may make one! Does yours extend above the top burner ring ? Roughly how long is it please?
Hope you can respond after so long a time!
regards
Confused
