pvc heating issues (again)

[Waterman]

Good to know. I didn't know they came in 300 watt versions. If I ever build a 8x4x4, I'll give Pro Products a call.

It’s a big panel. Measures 3’x2’. Expensive as well lol. In the case of the op here, it could be multiple things…heat panel too small/under powered or even defective, thermostat issues, how they are measuring the temps…is 83 the air temp or the ground temp taken with a temp gun? Even substrate can play a role with how the temps are measured believe it or not.