The answer is yes. None of them last forever. I would cross check both heaters and the thermometer. Just test each heater in a sink or plastic tub with a new thermometer. Some times you can actually see the leads burning as they operate. Its fun but a bad sign.;( You can also just toss your old thermometer in to another established tank and compare it with the heater thats already in there. Clay A. On Monday, December 7, 2009, at 12:00 PM, gsas-member-request@thekrib.com wrote: > So do heaters die? Both heaters in this tank are at least 5 years old. > Maybe > a trip to Denny's is in order tonight. _______________________________________________ GSAS-Member mailing list GSAS-Member@thekrib.com http://lists.thekrib.com/mailman/listinfo/gsas-member