I have a Eheim 300w 60Hz aquarium heater for my 120 gallon. I have been having some temp swings. The weather is changing here so we have been opening the windows and as such, the ambient temp does swing as well, 68 to 73 usually. I decided to test the heater cause I know they go bad. This one is about 8 months old. I first checked the thermometer in an ice bath and it read 33.4F (about 1.4F) off so not bad. I filled a 24 gallon tote and used that for the heater and waited till the light turned off. The light did turn off after about two hours and the temp read 81F (so it was actually 79.6F). The heater was set at 77F so it was way off so I calibrated it. I reset the heater to 78F and walked away. A few minutes later I checked the heater had turned itself on again but the temp still read 81F. I should mention that for the last several days I have been keeping the heater unplugged during the day and the tank never goes below 79F and usually stays at 81.
Do you think it went bad and needs replaced?
If so, what should I get for a replacement? I would like to something I could put in the sump. The main chamber is 7.5"deep and 12"x12" wide and long. ANy ideas?
Do you think it went bad and needs replaced?
If so, what should I get for a replacement? I would like to something I could put in the sump. The main chamber is 7.5"deep and 12"x12" wide and long. ANy ideas?