Could a leaking boiler be fixed?
It was built, so therefore it can be fixed or re-built. But, can you even get just that part or portion of assembly? Can you find someone to weld the hole shut? Both very doubtful, but absolutely worth a shot. Although, definitely get an HVAC person or firm in to let you know for sure. They have access that the public doesn't. However, this may very well be just a symptom of a failing &amp; rotting boiler, so replacement may be the only real or long-term course of action.