Usually when the coil fails on a 30 year old boiler it is not worth trying to replace. You may not even be able to remove it if the steel or cast iron has rusted it in place. I would lean towards replacing the entire boiler, as others have said. Another choice would be to add an indirect water heater. (superstore, etc). You'll need to add a hot water zone to the boiler, but that is easy. It's a much better setup than the coil on the boiler, and isn't "a waste" even if you change out the boiler in the next few years.
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