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A PSE&G reepairman in New Jersey has stated that my boiler is cracked. He put a red tag on it but did not shut off the gas to it. He is claiming that the crack is in the top part of the boiler. There is no water leaking on to the floor. A local plumber has tested the boiler and said it is working fine and he thinks there isn't a crack at all but maybe a hairlilne one.
Questions: (1) If there is a small hairline crack that doesn't emit water is it dangerous to operate the boiler?
(2) Should the boiler be replaced?
(3) Is there a danger of carbon monoxide poisoning?