Aquarium Heater Digital Dual Display- 100W

Answer:

To set the temperature lower you must click the button on top to take the temp higher and then after 92 degrees it will start again at lowest temp of 67 and you can increment from there.

Answer:

Greetings Mark,

It is safe to assume hobbyist have heaters of different wattage in the same aquarium. It is very true hobbyist use two heaters in an aquarium as well. And there are a few good reasons for this.

Due to the potential 30 degree swing, as you mentioned, the D2HT-200 is well suited for your application. Unlike traditional heaters, the D2HT Series includes a separate temperature probe for a highly accurate reading. Traditional heaters read temp as they are heating and this is happening from the same source. In a 20 gallon aquarium like yours, there is a potential for overheating when using a traditional heater of higher wattage. The D2HT Series takes out the guess work by using a separate temperature probe. When your aquarium water reaches the target temperature, the D2HT Series heater powers down. For your application, a traditional heater may overshoot the target temperature subjecting your aquatic life to higher than normal temperatures, plus a dip in temperature after the heater has stabilized.

If you have any further questions or concerns, please do not hesitate to give us a call or shoot us an additional email.