Hi everyone, I enjoy reading the posts. I recently made a water heater for the birds similar to the cookie tin idea that was posted here earlier. The problem is, I used a tin pan placed upside down with a light bulb inside, and it is not doing the job. The tin is 5" deep and about 15" diameter. I put a 5 gal metal waterer on top. I assume I need to put a bottom on the upside down tin to trap more heat. I wonder if you have any ideas on what kind of bottom to put on and how. I don't weld, but thought I would put a piece of sheet metal on the bottom, but then I thought there may be some insulation material that would work better. I have a 100 watt bulb in there now. I am in MN and it is cold, about 10 -15 degrees F during the day, which is the only time I have the heater on and water out. Thanks. I am not very computer saavy, so no pictures. Maybe later.