Trying to find the manufacturer

I just joined this forum and am trying to ID a coal fired water heater that I acquired back in 1968. I am now trying to restore it and find that there is no manufacturer's name on any of the castings. However, I see that almost every cast piece has "30 W " on it. I'm guessing that those numbers refer to a model number but I'm not sure.
Any help in IDing this unit will be appreciated.

Hi Bob - can you post some pictures of the unit in question?

Rob,
Right now I have the whole unit disassembled and my digital camera is not working.
I have some more cleaning to do and then I will start assembly. Hopefully I will have the camera fixed by then and will take some photos to post.
TKS for the response.
Bob

In the mean time welcome to the Forum BOBBLE, there are some knowledgeable members here that might be able to ID it for you.