I thought I had read that some manufacturers suggested against aluminum tape on heaters. I wasn't willing to risk damaging my heater to pry it up. You can attach the thermostat probe to the outside of the uth and it will work fine. You may just have to check the temp and adjust the settings on the thermostat to get the right temp. I didn't have to adjust mine at all with it attached to the back of the heater instead of between it and the glass. I found other heat resistant tape on Amazon and taped the probe wire to the uth right at the probe.
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