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Hello, the rating plate is the same as the boiler model and serial number plate which should be brass with black lettering riveted to the front of the boiler, about 3 x 4 inches in size. and with that L35 125KD model number on it.
Tell me roughly how large the building is please
Meantime I will check with the factory data base for you...
Let me know what you can find, we can go from there