Coliao 6pcs Film Heater Plate Adhesive Pad 12V 7W 25mmx50mm PI Heating Elements Film Strip Heater Adhesive Polyimide Heater Plate

I installed 4 of the 45x100, 30W @ 24V heaters on my 14 gallon stainless conical fermenter and run them in parallel with a 12VAC garden light power supply. I just tested the setup last night and it worked to heat up 8 gallons of water a couple of degrees within a couple of hours. I may update after I brew a batch, but I think this is enough to control my fermentation temperature. Using with an Inkbird ITC-308 WiFi controller. I can up the voltage to 24V if I need 2x the heat.

Great for a simple heater for beakers. Stick this on the bottom of a beaker, put a small thermal Barrer at the bottom (like a bit of rubber of something) and it will even work with a stirrer. Be sure to use a pid with this as it will get hot for small volumes.

Exactly as described, 1W heat generated by each heater given 5V power.

Super fast shipping made an excellent heated shield

I bought this for a project; however, it did not get hot enough for it. Beyond that, though, the heating films did work as intended and will serve well for other projects. Overall, I do not believe this is a bad product, especially for its price.

Worked as rated, and it gets hot quickly

It was smaller than what I have expected.