Hmmm.. I've had the opposite happen. A 250watt + a 300watt glass type heater struggled to keep up during the winter season. Removed both and used one 250watt titanium heater. I found it could heat up the water change bucket 10X faster then my Ebo glass heater. On the flip side I've heard comments that the controller for this particular titanium heater is unreliable.
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