The fact it happened while you were away makes me wonder if it might have not have been chunkloaded. Weird behavior like that can happen, because the water which is supposed to go to the boiler actually doesn’t make its way to it because the area is not loaded, and as a result, the boiler explodes even if it theoretically has the water it needs, it simply doesn’t calculate that into account at the same time. It is a good idea to always keep your machines chunkloaded if you’re going away on a trip, especially since they will run while you’re away.
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