Today we were changing out an Apollo Hydro Heat system and replacing it with a Heat Pump system in the attic of a 3 story house. We shut the water valve off to the unit, cut the lines and drained them. So far so good. After getting all the old material out of the attic I decided to go get the ODU done before it started raining. I started working on the ODU for approximately 25 minutes when I needed a tool that I had left up stairs in the 3rd story attic. When I got up to the top of the stairs I heard water and looked and sure enough the old apollo lines were just gushing out water all over this attic. I then ran downstairs and turned off the water valve that the electrician accidently turned back on while he was working next to the water heater. By this time there was water all the way down to the crawl space. Probably going to have to replace hardwood floors, sheetrock, and god knows what else. Needless to say I had a very bad day. Anyone else ever had this happen to them before????