Recently, my water heater has been releasing water intermittently. I say releasing and not leaking, because its clearly discharging water about half an hour after I turn on the heater and if nobody uses the hot water, and the water flow stops as soon as the hot water is used. The water clearly is coming from this valve thing attached to the cold water inlet (see picture http://img12.imageshack.us/i/imagefwx.jpg/) that kind of just discharges.. Into my ceiling space. Is it normal for this valve to discharge? From what I read on the Internet, maybe it's for water expansion in closed water systems, which sounds ok, except that its never happened in the past year I've been living here. If the discharge is not normal, it is a problem with the heater or the valve? I suppose there's no easy way to check on the Internet for this one, but if anyone has a simple test I could run, I could do it. If the heater and the valve are fine, is the valve supposed to just discharge into my ceiling? You might have noticed that there's a pipe that kind of ends nowhere in the picture. Was that supposed to be drainage pipe the the previous plumber just bochup? Wouldn't surprise me at this point. The false ceiling directly under the valve has a suspiciously thick layer of silicone on the top - I don't know if that was intended to do anything. Thoughts, tips welcome! Also, recommendations for a plumber, but I don't want to get chop carrot head, so ask here first if it's a big job or small job.. =p