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So... I was cooling off my boiled wort in the kitchen sink and my wife decided she needed water and turned on the tap. Luckily, it wasn't directly over the pot but she then swung the tap across and added X ml of extra water to the mostly cooled wort.

Mildly freaking out, I decided to re-boil for another 15 minutes. Other than upping my OG and SRM a bit, what are the potential issues/problems that can come out of a re-boil? I didn't totally fuck it did I?

Makeup sex.

Sandy

I think the tap water would be unlikely to harm it. Also I don't think the re-boil would harm it either, but it would change the hop profile if you had late hops. On the optimistic side, you might have inadvertently discovered a whole new way of brewing.

If you had any late hop additions you may have blown off some of the flavors and aromas and added a few more IBU's from them but I bet it will still turn out great. I had my wort chiller blow out in my kettle last winter and it added about two gallons of hose water to my wort before I noticed. I had some late hop additions there but nothing significant. I had to boil for an additional ~2hrs to get it back to my target volume. I just hit it with some new late additions and it still turned out good. I little more bitter than I planned but very drinkable.

PS Sandy: