Well, you don't mention a thermometer, so I am assuming you are going by the way the water feels to the touch. Since your body is 98.6 degrees, the water is going to feel chilly at 78 degrees or even 80 degrees. Purchase a thermometer for the tank if you do not have one. If you do have one, then compare the temperature reading to your home's temperature. It will never be colder in the tank than it is in the home. If the heaters truly are not working, then the tank water will be the exact same as the home temperature.
When installing a heater, place it in the tank, wait 5-10 minutes, then plug it in. It should always be fully submerged while plugged in.
Date published: 2018-11-27