I just had the same issue ended up buying a Ehiem true temp 350 Watt heater but it is almost 20" inches long.My temp has been consistent at 79° day and night.
My tank is 112 and I have a 31 gallon sump probably have 110 total gallons of water. I live in a very old house temp is usually about 65° I was going to get a 500 watt heater and ended up talking to one of the guys a AC he recomended the Ehiem heater and also price matched the online price for the heater.
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