DaToo Mini Aquarium Heater 25W, Preset 78°F
from $7.99 4.4 · 6,055 ratingsThe DaToo heater most betta keepers start with: a 25 W quartz tube that holds the water at 78°F with nothing to set. The light is red while it heats and green once it's there, and a stick-on thermometer is in the box.
Selected: 25 W · ships from the store
It must sit fully under water; place it near the filter outflow so warm water spreads instead of pooling at one end.
- Preset 78°F — ideal for betta and most tropical fish
- Red light heating, green light at temperature
- Rubber seal and explosion-proof quartz glass
- For 1–6 gallon glass or acrylic tanks
- Stronger 100–300 W sizes with the same design
Model specifications
| Option | Price |
|---|---|
| 25 W | $7.99 |
| 100 W | $11.99 |
| 150 W | $12.99 |
| 200 W | $13.99 |
| 300 W | $15.99 |
| Power | 25 W (100–300 W versions) |
|---|---|
| Temperature | Fixed 78°F |
| Tank | 1–6 gal (25 W) |
| Body | Quartz glass, rubber seal |
| Model | DT-25A |
Why a preset mini heater
A small tank changes temperature fast — a cold night can drop a 3-gallon tank several degrees. A preset heater removes the guesswork: the chip switches the element on below 78°F and off at 78°F, all day. There is no dial to knock or set wrong, which is exactly what most first betta tanks need.
The tube is about the width of a finger, so it hides behind a plant or in a back corner. The rubber seal is what keeps water out of the electronics — the weak point of cheap plastic-capped heaters.
Choosing a size
Use the 25 W model for 1 to 6 gallons. For bigger tanks the same design comes in 100, 150, 200 and 300 W; as a rule of thumb, allow about 3 to 5 watts per gallon in a heated room.
Customer reviews
SO HAPPY WITH THIS PRODUCT
Works great. stays in place with sucktion cup. Keeps the aquarium at 78 degrees. Isn't too big, doesn't take up room in the tank...I am SO PLEASED with this product
Warm and comfy !
Just perfect for beta tank which works well for guppy fry too !
