Though I haven't yet got a chance to specify relief valve to a water line, I have seen/investigated openings and damages in condensate lines that are supposed to move water at elevated temperature and sometimes at higher pressure also. The releases are always 2-phase with partial steam and a water spray. But the water temperatures were found around 130 F – 150 F. Hence, I would expect a 2-phase release if the water temperature is substantially high, say around 130 F. However, I would recommend you verify with Steam Table also to predict the situation.
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