i bought a eheim jager 100w for my new tank. For some reason the dial doesnt go above 83 degrees and the box clearly states it can go up to 93 degrees. My water has been heating up at 83 degrees for a good 24 hours and my water temperature is only at 73-74 degrees. The ambient air temp in my basement where im keeping the tank is only 63-65. Is there a way i can get my heater above that? im thinking its a safety lock or something. I need my water to be 78-80 degrees.