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We have a customer who i sold a boiler too, they have gone through 2 heat exchangers in probably 5 years this last one lasted only 3 years. They have tested the water in the boiler telling me it is fine, there is antifreeze in the loop. To go through 2 heat exchangers, stainless steel is unheard of. Any help would be helpful.
They tested the anti freeze, with test strips.
They say that the boiler was set up properly, and cleaned annually