Boyu · Glass
DR Digital Heater
- Heater
- 50–300 W
Everyday tropical tanks where you want to see the temperature without a separate thermometer.
6 models
Eheim · Glass
Eheim ThermoControl
ThermoControl is Eheim's standard adjustable glass heater, and it is the one many keepers have running for years without a second thought. You set it between 20 and 32 °C on the dial, and the electronics hold it within about half a degree.
Updated
25–400 W10 models
Will it suit my tank?
litres
Best for
Almost any planted tank, from nano to very large, where you want a proven heater you can set and forget.
Worth knowing
It is glass with no guard, so keep it clear of big digging fish and never lift it out while it is hot.
What stands out
- Adjustable 20 to 32 °C, held to about ±0.5 °C
- Red and green lamp shows when it is heating
- Dry-run protection switches it off if the water drops
- Ten sizes from 25 to 400 W
Models and specs
| Model | Heater | Tank size | Length |
|---|---|---|---|
| 25 W | 25 W | 20–25 L | 23.3 cm |
| 50 W | 50 W | 25–60 L | 23.3 cm |
| 75 W | 75 W | 60–100 L | 26 cm |
| 100 W | 100 W | 100–150 L | 30.9 cm |
| 125 W | 125 W | 150–200 L | 30.9 cm |
| 150 W | 150 W | 200–300 L | 33.5 cm |
| 200 W | 200 W | 300–400 L | 39.6 cm |
| 250 W | 250 W | 400–600 L | 44.2 cm |
| 300 W | 300 W | 600–1,000 L | 49.6 cm |
| 400 W | 400 W | 1,000–1,200 L | 49.6 cm |
- Brand
- Eheim
- Temperature range
- 20 to 32 °C
- Accuracy
- ±0.5 °C
- Cable
- 1.7 m
- Water type
- Freshwater and marine
- Warranty
- 3 years
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.
Compare with
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- Heater
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- Heater
- 50–300 W
Budget heating for community and planted tanks.
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Frequently asked questions
Quick answers about the Eheim ThermoControl, drawn from its specs.
What size tank is the Eheim ThermoControl for?
The maker rates it by model: 25 W up to 25 L, 50 W up to 60 L, 75 W up to 100 L, 100 W up to 150 L, 125 W up to 200 L, 150 W up to 300 L, 200 W up to 400 L, 250 W up to 600 L, 300 W up to 1,000 L, 400 W up to 1,200 L.
What wattage is the Eheim ThermoControl?
25 to 400 W across the range. As a rule of thumb that covers roughly 17–400 L in a normally heated room, at about 1 W per litre.
Who is the Eheim ThermoControl best for?
Almost any planted tank, from nano to very large, where you want a proven heater you can set and forget.
Is there anything to watch out for with the Eheim ThermoControl?
It is glass with no guard, so keep it clear of big digging fish and never lift it out while it is hot.
What are the alternatives to the Eheim ThermoControl?
Other heaters worth comparing: Boyu DR Digital Heater, Boyu DR-9 Series Heater, Boyu GR Glass Heater. Add any of them to the compare table to see the specs side by side.