I bought this after buying another brand at my local pet store. After two failed attempts at using their ceramic heat emitter (one didn't work out of the box, the other died within 24 hours), I decided to seek out the product on Amazon.This does not fail to deliver. I have a Chinese Water Dragon in a 90 gallon tank. Smaller heat emitters weren't keeping one end of the tank warm enough. I keep this on 24/7 and haven't had it off since I bought it. It's still working like the day I bought it. If you're looking for a quality product, I recommend this brand. Just make sure you get the right size for your type of enclosure.