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Giannoni Heat Exchanger Surface Area

JJS Member Posts: 3
Anyone out there aware of the different surface areas that boiler manufacturers use in their Giannoni exchangers?  I have noticed recently it looks like one manufacturer in particular seems to over fire their boiler to the rating I see on the ASME stamp of the exchanger -- not sure if all the manufacturers do or not. 

The one in question says the rating is simply a minimum relief valve capacity - not a firing capacity.  Oddly enough I have had quite a few exchangers burn out of these boilers -- not a lot of experience however in others.

Any one have info on...

Hamilton Engineering


Heat Transfer - Munchkin



Viessmann (although not Giannoni but similar design)

Looking for a simple BTU input per sqft surface area
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