On Tue, 17 Aug 2010 19:36:14 -0600, Uno wrote:

I just was cleaning my water heater and see the exhaust pipe on it has
come loose in the middle. Can I just duct tape it for now and not
expect it to melt?

I don't know what you can and can't expect, but I would expect it to
melt.

Use foil tape meant for that purpose.