Boyu · Electronic / app
PTC Digital Heater
- Heater
- 300–1,000 W
Large aquariums that need serious heating with accurate control.
4 models
UNS · Electronic / app
UNS Micro Aquarium Heater
A very small heater for pico and nano tanks, with the thermostat and display on an external controller on the cable. The heating element is tiny enough to hide behind a rock, and it switches itself off if the water drops too low.
Updated
10–20 W2 models
Will it suit my tank?
litres
Best for
Betta tanks and nano cubes under 20 litres where a normal glass heater would dominate the tank.
Worth knowing
The 20 W version has a US mains plug and 110 V rating, so check it suits your country's supply.
What stands out
- 10 W for about 4 to 8 L, 20 W for about 8 to 19 L
- External digital controller on the cable
- Low-water auto shut-off
- 10 W runs from USB; 20 W uses a mains plug
Models and specs
| Model | Heater | Tank size | Power |
|---|---|---|---|
| 10 WMAH10W | 10 W | 3.8–7.6 L | USB |
| 20 WMAH20W | 20 W | 7.6–18.9 L | US mains plug |
- Brand
- UNS
- Control
- External digital thermostat
- Safety
- Auto shut-off when water level is low
- Mains
- 110 V
Figures from Glass Aqua's product listing. 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
- 150–300 W
- Tank size
- 200–1000 L
Larger tanks where you want remote alerts about temperature, especially if you are away a lot.
3 models
SunSun · Electronic / app
ARB Digital Heater
- Heater
- 500–1,000 W
- Tank size
- 300–900 L
Large display tanks and sumps.
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XRB Intelligent Heater
- Heater
- 600–1,000 W
- Tank size
- 300–900 L
Large tanks and sumps.
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Frequently asked questions
Quick answers about the UNS Micro Aquarium Heater, drawn from its specs.
What size tank is the UNS Micro Aquarium Heater for?
The maker rates it by model: 10 W up to 7.6 L, 20 W up to 18.9 L.
What wattage is the UNS Micro Aquarium Heater?
10 to 20 W across the range. As a rule of thumb that covers roughly 7–20 L in a normally heated room, at about 1 W per litre.
Who is the UNS Micro Aquarium Heater best for?
Betta tanks and nano cubes under 20 litres where a normal glass heater would dominate the tank.
Is there anything to watch out for with the UNS Micro Aquarium Heater?
The 20 W version has a US mains plug and 110 V rating, so check it suits your country's supply.
What are the alternatives to the UNS Micro Aquarium Heater?
Other heaters worth comparing: Boyu PTC Digital Heater, Eheim thermocontrol+e, SunSun ARB Digital Heater. Add any of them to the compare table to see the specs side by side.