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Identifying boiler capacity
I have an old Weil-McLain boiler that's probably been in the house for at least 20 years and I can't find any information on the model number or the size of the boiler. When I take the front cover off, I find a sticker that says "Installation incomplete unless rating plate attached here." Awesome. A call to the knuckleheads that put it in revealed that they don't have records that far back.
Anyway, I'm at Phase 1 of my steam heat redevelopment project--that is, I'm having all the steam traps fixed, the venting fixed, installing TRVs upstairs, fixing the condensate pump, etc.
I'm planning Phase 2 for next year. That will involve deciding whether to replace the boiler or to keep the current boiler and have the copper header replaced with a nice black steel drop header that will use both riser ports instead of just one (though W-M's current steam boiler manual says using the one riser is acceptable for some reason). Knowing the capacity of the current boiler will help me make that decision. I've measured the EDR in the house and determined that the acceptable DOE should be somewhere between 130 (using a .33 pickup) and 150 (using a .5 pickup).
Can anyone roughly identify the boiler model I have so I can call W-M? If there's a way I can estimate the size by taking a few panels off, that would really help me. Here's a few pictures: