I just went down and looked and there are no indications of watts on it. I had it on a 30g that had a big filter moving water around in it and it keep that tank well over 80 no problem, it's an older heater but is reliable and works so if you think you can use it it's all yours. I work from home so daytime is fine with me. I'll be around tomorrow (Fri) from about noon - 3:30'ish for sure. Just drop me a PM if your gonna be in the area and I'll give ya my address.