I was awakened by a noise that sounded like someone running a bath. No one was up, so I began looking around - nothing, just the noise. Went to the garage to the water heater it was making the noise like someone was using a ton of hot water. I went outside to turn the main water off, and when I went out I saw water gushing from the side of the house. (There has always been a small pipe coming out from the house that I never knew what it was for) I live in a brick home that was built in early 1980's. Who can tell me what this mysterious pipe is and why water (hot water) would be gushing out of it? Any feedback would be appreciated! Thanks