I have recirculating hot water for heat. There is an expansion tank and an automatic air vent above it. I am getting a slow leak of water from it. Like a drip once in a while. I put a small tin under it, and keep an eye on it, figuring it would go into summer and get fixed when I have the system cleaned. Well I just looked and there is more water all of a sudden. Guess I put it off too long. I plan to go away for the weekend; anything I should do, so I don't come home to a flooded basement? I do not think I can replace these parts (both are bad), and I doubt the biz that I use for service can get to it this week (but I plan to call tomorrow).