Flow Heater BT – a Bluetooth-enabled flow-through aquarium heater
Aquael Flow Heater BT is an external flow heater for aquariums, controlled from a smartphone over Bluetooth…
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The Flow Heater BT is a flow-through heater for aquarium keepers who want to set and track water temperature from a phone rather than adjust a heater inside the tank. It is mounted outside the aquarium, so the tank keeps its full volume for fish, plants and décor.
Why it matters
- Remote control: the heater pairs with the Aquael BT app on iOS and Android via Bluetooth, where you set the target temperature and maximum working power.
- Fine temperature control: the target can be set between 19°C and 33°C in 0.1°C steps, and the app shows the current water temperature and its history.
- Two operating modes: a constant mode with one fixed temperature, and a Day&Night mode with separate day and night temperatures and sunrise and sunset times set in the app.
- Gradual transitions: in Day&Night mode, temperature changes take up to 180 minutes, adjustable in 15-minute steps, which the manufacturer states reduces stress for fish and other tank inhabitants.
- Status LEDs: a white Power LED confirms the mains connection, a blue Bluetooth LED shows readiness for app control, and a green Status LED shows heater operation, pulsing while the water is heating.
Specifications
- Product type: flow heater, mounted outside the aquarium
- Rated power: 50 W
- Power regulation step: 50 W
- Temperature range: 19–33°C
- Temperature setting precision: 0.1°C
- Operating modes: constant and Day&Night
- Transition time in Day&Night mode: up to 180 min, adjustable every 15 min
- Control: Bluetooth, Aquael BT app (iOS, Android)
- Weight: 0.6 kg
- Brand: Aquael
- EAN: 5905546345040
What it works with
This heater fits freshwater and planted aquariums where the heating needs to be controlled precisely and monitored remotely. It is listed in the Aquatic Heating, Cooling and Thermometers category, so it is intended as part of an aquarium's temperature setup. Check that the flow heater suits your tank setup and that the rated power and temperature range match your species' requirements.
Technical specification
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Frequently asked questions
Yes. The heater connects to the Aquael BT app over Bluetooth, which is available on iOS and Android. In the app you can set the target temperature, choose the maximum working power, and check the current water temperature and its history.
You can set the target temperature from 19°C to 33°C in steps of 0.1°C. Power is adjusted in steps of 50 W.
Day&Night mode lets you program separate day and night temperatures and set the sunrise and sunset times. Temperature changes are gradual, spread over up to 180 minutes in 15-minute steps, which reduces stress for fish and other tank inhabitants. If you prefer a single setting, the constant mode lets you set one temperature and one power level.
The white Power light shows that the heater is correctly connected to mains power. The blue Bluetooth light shows it is ready to be controlled from the app. The green Status light shows the heater is working, and when it pulses, the water is being heated.
No. It is a flow-through heater installed outside the aquarium, so it does not take up any space in the tank.
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