Eheim · Preset
ThermoPreset
- Heater
- 50–200 W
- Tank size
- 25–400 L
Beginners and community planted tanks that are happy at 25 °C.

Dophin · Preset
A tiny quartz heater with a switch for 23, 25 or 27 °C. The three wattages each suit a nano of 5, 10 or 15 litres.
Updated
A small shrimp or betta tank where you just want a stable, sensible temperature.
No fine control between the three settings, so check with a thermometer.
| Model | Heater | Tank size | Length |
|---|---|---|---|
| 5W | 5 W | up to 5 L | 7 cm |
| 10W | 10 W | up to 10 L | 8 cm |
| 15W | 15 W | up to 15 L | 9 cm |
Figures from the maker's published specifications. Makers revise products, so check the current figures before buying. Photos supplied by the brand or its distributor.
Eheim · Preset
Beginners and community planted tanks that are happy at 25 °C.
Dophin · Preset
A nano or small shrimp tank that just needs taking off the chill.
Boyu · Glass
Everyday tropical tanks where you want to see the temperature without a separate thermometer.
Boyu · Glass
General tropical tanks on a budget.
Quick answers about the Dophin AH-1010 Mini Heater, drawn from its specs.
The maker rates it by model: 5W up to 5 L, 10W up to 10 L, 15W up to 15 L.
5 to 15 W across the range. As a rule of thumb that covers roughly 3–15 L in a normally heated room, at about 1 W per litre.
A small shrimp or betta tank where you just want a stable, sensible temperature.
No fine control between the three settings, so check with a thermometer.
Other heaters worth comparing: Eheim ThermoPreset, Dophin AH-1000 Plastic Mini Heater, Boyu DR Digital Heater. Add any of them to the compare table to see the specs side by side.