What is the heat tape resting on? That could be taking away some of the energy.

To test, plug the Flexwatt directly into the wall outlet - no controller in the middle - and measure temps after a few minutes to compare. If it still is below your setpoint, then your Flexwatt cannot deliver any more energy than it already is. You can set the controller setpoint to 1 million degrees - won't matter.

Often times shelves will suck the heat away. Depends on alot of factors, material of the shelf and ambient air temps perhaps the biggest factors. Watt-density of the Flexwatt is a huge factor too. Some 4-inch Flexwatt is only 5 watts/ft vs other which is 8 watts/ft.
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Mark

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