I'm with the others. The cast iron boilers i've seen are sectional. Pull the jacket, bag up the insulation ( watch for asbestos), and undo the nuts on the ends of the long rods that hold all of the sections together.
Socket wrench would do.
If the nuts are rusted solid heat them up cherry red and then just feed a little bit of paraffin in every so often as it's cooling.(90 % of the time that will free up a frozen nut.)
Electric impact wrench ! zip,zip,zip .....just like a tire change at the garage.
A four inch grinder on the nuts if you could get it in there.
If all else fails, a metal cutting blade on a skil saw will work on cast iron. The blades are only a couple of bucks each. When they wear down to 4" dia. toss em' aside and use them for your angle grinder later.
It's not so bad with the right tools. The job can go quick -n- easy.
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