Boyu · Glass
DR Digital Heater
- Heater
- 50–300 W
Everyday tropical tanks where you want to see the temperature without a separate thermometer.

Juwel · Glass
Juwel's adjustable glass heaters, made in borosilicate glass with TÜV/GS safety certification. They are shaped to sit inside the Bioflow filter housing in Juwel aquariums, where they stay out of sight and heat the water as it passes through. They work in any tank, but they make most sense in a Juwel.
Updated
Juwel aquarium owners replacing or upgrading the heater inside their Bioflow filter.
| Model | Heater | Length | Diameter |
|---|---|---|---|
| AquaHeat 50207270 | 50 W | 19 cm | 25 mm |
| AquaHeat Pro 100207272 | 100 W | 30.5 cm | 30 mm |
| AquaHeat Pro 200207274 | 200 W | 34 cm | 30 mm |
| AquaHeat Pro 300207275 | 300 W | 37.5 cm | 30 mm |
Figures from Charterhouse Aquatics's product listing. Makers revise products, so check the current figures before buying. Photos supplied by the brand or its distributor.
Boyu · Glass
Everyday tropical tanks where you want to see the temperature without a separate thermometer.
Boyu · Glass
General tropical tanks on a budget.
Boyu · Glass
Medium tanks where you want an easy-to-read set point on the outside of the tank.
Boyu · Glass
Budget heating for community and planted tanks.
Quick answers about the Juwel AquaHeat, drawn from its specs.
50 to 300 W across the range. As a rule of thumb that covers roughly 33–300 L in a normally heated room, at about 1 W per litre.
Juwel aquarium owners replacing or upgrading the heater inside their Bioflow filter.
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.
4 options: AquaHeat 50, AquaHeat Pro 100, AquaHeat Pro 200, AquaHeat Pro 300.