I haven't had one fail or burn out yet. Your UTH may be running cooler because it's winter and depending on the ambient temps in the room, it may be dissipating more of the heat. I had this problem last winter, and I solved it by getting a sheet of styroprene insulation from my local home improvent store and taping it over the UTH. This basically sends all the heat up into the tank, and as long as you are using a good thermostat it shouldn't over heat. I've had it this way for about a year now and have had no problems...
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