Thanks for your reply. How do I go about fixing this? Is this something my furnace dealer would handle?

Well, my oil company came out tonight. They told me I have a leak beneath the floor. I don't have a basement, the house sits on a concrete slab. The problem I'm having with the heat exists on the lower level. They told me to find a plumber and they would try to locate the leak. I'm not to sure this guy knew what he was talking about, at least I hope he didn't. What do you think?

Thanks for the suggestion. I turned what I believed to be the right valve off and sure enough, no more heat. However, I still hear a steady air like sound coming from my baseboard. What could this be?

When my oil company came they also had me turn off the boiler and showed me that the pressure was not holding.

Im sorry but I did not follow your logic and wanted to verify.. If I turned the valve off and heat to this area stopped, what did I prove? I do have a leak or not?

I was sitting at my computer and I removed my slippers. I noticed the plastic floor mat was warm. Immediately, I removed the floor mat and noticed the carpet was wet. Guess what? I found my leak. It is very close to the baseboard that the hissing sound is coming from. All this time, the problem was right underneath me. Now comes the decision, get someone to digg and locate or run a perimeter loop.

[This message has been edited by tate16t (edited November 02, 2002).]

ok, I found the problem pipe underneath the concrete slab and the plumber repaired it Thursday. My heat is working fine, no more problems. My question is, how long should I wait before covering up the hole with concrete?