What watts dose the heater have to be in a turtle tank?

The appropriate wattage for a heater in a turtle tank depends on the size of the tank and the desired water temperature. Generally, you should select a heater rated for 5-10 watts per gallon of water.

For example, a 10-gallon tank would require a 50-100 watt heater. Additionally, make sure the heater is fully submersible and features an adjustable thermostat to control the water temperature accurately. It's essential to monitor the water temperature regularly using a thermometer to ensure proper regulation.