DaToo Mini Aquarium Heater 25W

The DaToo Mini Aquarium Heater (model DT-25A) is a 25W preset heater for small tanks. It automatically keeps water at 78℉, which suits bettas and most tropical fish, and comes with a free thermometer sticker.

Preset temperature

There is nothing to set. When the water drops below 78℉, the heater switches on; when it reaches 78℉, it switches off and holds steady. For a betta in a desktop tank, that is usually all you need.

Small body

DaToo designs the heater for small tanks of 1 to 5 gallons, and lists it for 1 to 6 gallon desktop aquariums in glass or acrylic. A small heater leaves more swimming room and is easy to hide behind decor.

Seal and glass

Instead of a plastic seal, DaToo uses a rubber sealing layer at the cap. The body is quartz glass, chosen for crack resistance. Like any glass heater, avoid bumping it during maintenance and never let it run out of water.

Safe use

• Keep the heater 100% submerged while it is plugged in.
• Unplug it before water changes and let it cool before lifting it out.
• Place it in the filter flow so warmth spreads evenly.
• Use the thermometer sticker to confirm the tank reaches 78℉.

Warranty

DaToo offers a one year warranty with a satisfaction guarantee and customer service.

Compare

For a similar preset heater with a ±3°F tolerance stated, see the PULACO 25W mini heater. If you want to choose your own temperature, the hygger small betta heater adds a digital controller.

Who it suits

Betta keepers and owners of small desktop tanks who want a set-and-forget heater. If your room runs cold in winter, check the tank more often; a 25W heater has limited power to lift water far above room temperature. A lid on the tank reduces heat loss and helps a small heater keep up.