Best Aquarium Heaters for Planted Tanks by Tank Size (2026)
Preset and adjustable aquarium heaters for planted tanks, grouped by the maker's rated tank size, with temperature settings and safety features.
Match the heater to the maker's rated tank size, then decide whether you need to set the temperature yourself. For nano and betta tanks, the Fluval P10 (up to 3 US gal) and Aqueon Mini Heater (2.5 to 5 US gal) are the smallest options. For small tanks, the hygger HG031 25 W (5 to 10 US gal) is adjustable with a readout, while the Tetra HT10 and Aqueon Pro 50 W cover tanks up to 10 and 20 US gal. For mid-size tanks, the Fluval E100 and E200 are rated up to 30 and 65 US gal and show the water temperature.
Who this guide is for
This guide is for planted tanks that need steady warmth because the room runs cooler than the fish, shrimp or plants you keep. If you're not sure what temperature your species need, check a care sheet for each one before choosing between a preset and an adjustable model.
The heaters below fall into two types:
- Preset heaters hold one temperature set at the factory. The Fluval P series holds 76 to 78 °F and the Tetra HT10 holds 78 °F. There is nothing to adjust, which is also the limitation.
- Adjustable heaters let you choose the temperature. Some show it on a display (hygger HG031, Fluval E series), and some don't (Aqueon Pro).
Before you buy, work out your tank's real water volume with our aquarium volume calculator. A tank's nominal size and the water it actually holds after substrate and hardscape are often different.
Comparison table
| Product | Fits | Best for | Skip if |
|---|---|---|---|
 Fluval P10 Submersible Heater (10 W)Model A743 | up to 3 gal; low-tech tanks, CO2 tanks | A nano or betta tank up to 3 gallons where a fixed tropical temperature is fine. | You keep species that need a temperature outside 76-78 °F or your tank is over 3 gallons. |
 Aqueon Mini Heater (10 W)Model 100106194 | 2.5–5 gal; low-tech tanks, CO2 tanks | A 2.5 to 5 gallon betta or desktop planted tank that needs gentle background heat. | You need to dial in a specific temperature or your tank is larger than 5 gallons. |
 hygger Small Aquarium Betta Heater (25 W)Model HG031 | 5–10 gal; low-tech tanks, CO2 tanks | A 5 to 10 gallon planted or shrimp tank where you want to set and read the temperature. | You want a heater with no external controller or cable clutter. |
 Tetra HT Submersible Heater (HT10, 50 W)Model 26447 | 2–10 gal; low-tech tanks, CO2 tanks | A beginner 5 or 10 gallon planted tank that just needs a steady 78 °F. | Your livestock needs a temperature other than 78 °F. |
 Aqueon Pro Adjustable Heater (50 W)Model 100532083 | up to 20 gal; low-tech tanks, CO2 tanks | A 10 to 20 gallon planted tank where you want an adjustable, shatterproof heater. | You want a built-in temperature readout. |
 Fluval E100 Advanced Electronic Heater (100 W)Model A772 | up to 30 gal; low-tech tanks, CO2 tanks | A 20 to 30 gallon planted tank where you want to see the water temperature at a glance. | Your tank has weak circulation where the heater would sit. |
 Fluval E200 Advanced Electronic Heater (200 W)Model A773 | up to 65 gal; low-tech tanks, CO2 tanks | A 40 to 65 gallon planted tank that needs one heater with a clear readout. | Your tank is shallow or has weak flow where the heater would mount. |
The tank sizes in the table are the ones each maker publishes. Fluval states its ratings in both US gallons and liters; Aqueon, hygger and Tetra state US gallons.
Nano tanks (up to about 5 US gal)
Keeping a betta? Our planted betta tank guide plans for 5 US gal or more, so look at the small-tank picks below too.
Fluval P10 Submersible Heater (10 W)
- Best for
- A nano or betta tank up to 3 gallons where a fixed tropical temperature is fine.
- Skip this if
- You keep species that need a temperature outside 76-78 °F or your tank is over 3 gallons.
- Wattage
- 10 W
- Rated tank size
- Up to 3 US gal / 10 L
- Temperature
- Preset, maintains 24-26 °C (76-78 °F); no adjustment
- Housing
- Tough polymer exterior (not a glass sleeve)
- Indicator
- Red light when heating
- Maximum operating depth
- 0.9 m (2.9 ft)
- Warranty
- 2 years
- Preset 76-78 °F, so there is nothing to set.
- Polymer body that Fluval says will not crack like glass heaters.
- Rated for nano tanks up to 3 gallons.
- Temperature cannot be adjusted.
- Rated only up to 3 US gallons.
The P10 (model A743) is a 10 W preset heater rated for tanks up to 3 US gal (10 L). Fluval says it maintains 24 to 26 °C (76 to 78 °F) and can't be adjusted. The body is a tough polymer exterior rather than a glass sleeve, and a red light shows when it's heating. Fluval's manual gives a maximum operating depth of 0.9 m (2.9 ft), says the heater must stay completely submerged, and recommends placing it near water movement, generally at the rear of the tank. It carries a 2-year warranty. Fluval also notes that a cool room, an uncovered tank or a nearby cooling source may call for more wattage, which matters in a small tank that loses heat quickly.
Aqueon Mini Heater (10 W)
- Best for
- A 2.5 to 5 gallon betta or desktop planted tank that needs gentle background heat.
- Skip this if
- You need to dial in a specific temperature or your tank is larger than 5 gallons.
- Wattage
- 10 W
- Recommended tank size
- 2.5 to 5 US gal (desktop aquariums)
- Housing
- Shatterproof
- Safety
- Thermal safety shut-off
- Warranty
- 90 days
- Dimensions (maker-listed)
- 3.58 x 2.25 x 6.85 in
- Sized by Aqueon for 2.5 to 5 gallon desktop tanks.
- Shatterproof housing with a thermal safety shut-off.
- No published temperature setting or adjustment range.
- Short 90-day warranty.
Aqueon's Mini Heater is a 10 W heater that Aqueon describes as ideal for desktop aquariums of 2.5 to 5 US gal. It has a shatterproof housing and a thermal safety shut-off, and the maker lists its dimensions as 3.58 x 2.25 x 6.85 in. Aqueon doesn't publish a set temperature or an adjustment range for it, so you won't know the target temperature from the box. A thermometer is the only way to see what it's doing in your tank. The warranty is 90 days, the shortest here.
Small tanks (about 5 to 20 US gal)
hygger Small Aquarium Betta Heater (25 W)
- Best for
- A 5 to 10 gallon planted or shrimp tank where you want to set and read the temperature.
- Skip this if
- You want a heater with no external controller or cable clutter.
- Wattage
- 25 W
- Rated tank size
- 5-10 US gal
- Temperature range
- 59-93 °F (15-34 °C)
- Display
- LED digital display, switchable °F/°C
- Controller
- External controller
- Heater tube
- 2 mm thickened quartz glass
- Protection
- Dry-run and overheating protection; error code E1 when out of water
- Memory
- Retains settings after power loss
- Water type
- Fresh and marine
- Adjustable 59-93 °F with a digital readout.
- External controller keeps adjustments out of the water.
- Remembers its setting after a power cut.
- Quartz glass tube rather than a shatterproof shell.
- Controller box needs a place to sit outside the tank.
The HG031 is the adjustable option for small tanks. This listing is the 25 W version, which hygger rates for 5 to 10 US gal. You set the temperature on an external controller from 59 to 93 °F (15 to 34 °C), and an LED display shows it in °F or °C. The heater tube is 2 mm thickened quartz glass. hygger lists dry-run and overheating protection, shows error code E1 when the heater is out of water, and says it keeps its setting after a power cut. On the maximum temperature, hygger's page says heating stops at 93 °F, and that is the figure we use. hygger also sells 10 W (1 to 5 gal), 50 W (8 to 16 gal) and 100 W (10 to 26 gal) versions, so check the wattage on the listing matches your tank.
Tetra HT Submersible Heater (HT10, 50 W)
- Best for
- A beginner 5 or 10 gallon planted tank that just needs a steady 78 °F.
- Skip this if
- Your livestock needs a temperature other than 78 °F.
- Wattage
- 50 W
- Rated tank size
- 2-10 US gal
- Temperature
- Electronic thermostat keeps water at a constant 78 °F
- Indicator
- Red when heating, green on standby
- Safety
- Shuts off if an electrical short is detected
- Fixed 78 °F, so there is nothing to set.
- Two-color light shows heating vs standby at a glance.
- Temperature cannot be adjusted.
- Tetra's page does not list materials or warranty.
The Tetra HT10 (model 26447) is a 50 W preset heater rated for 2 to 10 US gal. Tetra says its electronic thermostat keeps the water at a constant 78 °F. The indicator light is red when heating and green on standby, and Tetra says it shuts off if an electrical short is detected. Tetra's page doesn't list materials or warranty. The same HT line includes the HT30 (100 W, 10 to 30 gal), HT40 (150 W, 30 to 40 gal) and HT55 (200 W, 40 to 55 gal) if your tank is larger.
Aqueon Pro Adjustable Heater (50 W)
- Best for
- A 10 to 20 gallon planted tank where you want an adjustable, shatterproof heater.
- Skip this if
- You want a built-in temperature readout.
- Wattage
- 50 W
- Rated tank size
- Up to 20 US gal
- Temperature range
- 68-88 °F
- Thermostat accuracy
- Electronic thermostat, +/- 1°
- Housing
- Thermal plastic shatterproof housing
- Safety
- Auto shut-off on overheat (resets when cool); shuts off if the top tilts below the bottom
- Indicator
- Red LED when heating
- Water type
- Freshwater or saltwater
- Dimensions
- 1.5 x 1.75 x 9 in
- Warranty
- Limited lifetime
- Adjustable 68-88 °F with an electronic thermostat.
- Shatterproof plastic housing.
- Limited lifetime warranty.
- No temperature display; you still need a thermometer.
- 50 W size is rated only up to 20 gallons.
The Aqueon Pro 50 W (model 100532083) is rated for tanks up to 20 US gal. It adjusts from 68 to 88 °F with an electronic thermostat that Aqueon gives as accurate to within 1°. The housing is a shatterproof thermal plastic. Aqueon lists two safety shut-offs: one when the heater overheats, which resets once it cools, and one if the top of the heater tilts below the bottom. A red LED shows when it's heating. It measures 1.5 x 1.75 x 9 in and carries a limited lifetime warranty. There's no temperature readout, so pair it with a thermometer. Aqueon also sells 100, 150, 200 and 300 W sizes, but the page we checked gives a tank rating only for the 50 W.
Mid-size tanks (up to 65 US gal)
Fluval E100 Advanced Electronic Heater (100 W)
- Best for
- A 20 to 30 gallon planted tank where you want to see the water temperature at a glance.
- Skip this if
- Your tank has weak circulation where the heater would sit.
- Wattage
- 100 W
- Rated tank size
- Up to 30 US gal / 120 L
- Display
- LCD with color backlight: green within ±1 °C/±2 °F of set point, red above, blue below; flashes if outside ±3 °C/±5.5 °F
- Sensors
- Dual temperature sensors, microprocessor control
- Setting
- Factory set 25 °C / 77 °F; adjusts in 0.5° steps
- Flow warning
- Displays LF (low flow) when circulation is inadequate
- Construction
- Glass tube, ceramic heater core, removable heater guard
- Maximum immersion depth
- 100 cm (39 in)
- Warranty
- 5 years
- Live temperature display with color alerts.
- Low-flow warning if circulation drops.
- 5-year warranty.
- Glass core inside the guard.
- Needs good water movement around it to read correctly.
The E100 (model A772) is a 100 W heater rated for tanks up to 30 US gal (120 L). Its LCD shows the water temperature with a color backlight: green within ±1 °C (±2 °F) of the set point, red above, blue below, and flashing if the water drifts more than ±3 °C (±5.5 °F). Dual sensors feed a microprocessor, and the display shows "LF" (low flow) when circulation around the heater is inadequate. It comes factory set to 25 °C (77 °F) and adjusts in 0.5° steps. Inside a removable guard is a glass tube with a ceramic heater core. Maximum immersion depth is 100 cm (39 in) and the warranty is 5 years. Fluval says the heater must sit near a source of water movement, such as a filter outlet.
Fluval E200 Advanced Electronic Heater (200 W)
- Best for
- A 40 to 65 gallon planted tank that needs one heater with a clear readout.
- Skip this if
- Your tank is shallow or has weak flow where the heater would mount.
- Wattage
- 200 W
- Rated tank size
- Up to 65 US gal / 250 L
- Display
- LCD with color backlight: green within ±1 °C/±2 °F of set point, red above, blue below; flashes if outside ±3 °C/±5.5 °F
- Sensors
- Dual temperature sensors, microprocessor control
- Setting
- Factory set 25 °C / 77 °F; adjusts in 0.5° steps
- Flow warning
- Displays LF (low flow) when circulation is inadequate
- Construction
- Glass tube, ceramic heater core, removable heater guard
- Maximum immersion depth
- 100 cm (39 in)
- Warranty
- 5 years
- Live temperature display with color alerts.
- Low-flow warning if circulation drops.
- 5-year warranty.
- Glass core inside the guard.
- Long body needs enough water depth to stay above the MIN line.
The E200 (model A773) is the 200 W version, rated for tanks up to 65 US gal (250 L), with the same display, low-flow warning, 0.5° adjustment, 100 cm immersion limit and 5-year warranty as the E100. It has a longer body, so check that your water depth keeps it above the MIN line. Place it near the filter outlet, as with the E100.
How to choose
Preset or adjustable. A preset heater suits you if the factory temperature is right for everything in the tank. The Fluval P series holds 76 to 78 °F and the Tetra HT10 holds 78 °F. If your species need something else, or you want to change the temperature later, choose an adjustable model: the hygger HG031, Aqueon Pro or Fluval E series. The Aqueon Mini doesn't publish a temperature at all.
Display or no display. The hygger HG031 and Fluval E series show a temperature. The others don't, so a thermometer does that job. Even with a display, a separate thermometer is a useful cross-check.
Glass or plastic body. The Fluval P series uses a polymer exterior, and Aqueon describes both of its heaters as shatterproof. The hygger has a quartz glass tube, and the Fluval E series has a glass tube inside a removable guard. Handle any glass heater gently during maintenance.
Room temperature. Makers rate heaters under assumed conditions. Fluval states that the E-series ratings assume water up to 26 °C (78 °F) in a 20 °C (68 °F) room. For the P series, it notes that a cool room, no cover or a nearby cooling source may need more wattage. If your room is colder than that, or your tank is uncovered, consider the next size up within the same line.
Placement and compatibility
- Near water movement. Fluval says the E series must sit near a source of water movement such as a filter outlet, and recommends the same for the P series. Our planted aquarium filter guide covers flow in planted tanks.
- Depth. Check the maker's maximum depth (0.9 m for the Fluval P series, 100 cm for the E series) and make sure the water covers the minimum line.
- Controller and cables. The hygger's external controller needs a dry place to sit outside the tank. Leave a drip loop in every power cable.
- CO2 tanks. None of these heaters depends on the tank's style. Every record lists both low-tech and CO2 setups.
Alternatives and when to skip buying
If your room stays at a temperature that suits your livestock all year, you may not need a heater. Some planted tanks with cool-water species run unheated, and a thermometer will tell you whether yours stays stable. If you already have a working heater that holds the temperature you want, replacing it won't improve plant growth; light, CO2 and nutrients matter far more, as our beginner planted aquarium guide explains. For a very small tank, our nano planted tank setup guide covers equipment choices at that scale.
How we chose
Each heater was matched to its Amazon listing by model and wattage, and specifications come from the makers' product pages and manuals listed in the sources below. Where the Amazon listing and the maker disagreed, we used the maker's figure, as with the hygger's maximum temperature. We grouped heaters by maker-rated tank size and looked at temperature control, display, body material and stated safety features. We only included products with strong buyer feedback when we checked. This is a research-based guide: we haven't tested these heaters ourselves, and we don't rank or score them. None of the makers makes a specific statement about shrimp or other invertebrates for these heaters.
Related guidance
- Beginner planted aquarium guide
- Nano planted tank setup, for heating and equipment in small tanks
- Planted tank maintenance routine, including checking equipment during water changes
- Maintenance checklist
- Planted aquarium filter guide, for flow around the heater
- Tank setups
- Planted betta tank guide, for heater sizing and placement in a betta setup
Sources
- P Series Submersible Heater instruction manual (P10/P25/P50), Rolf C. Hagen / Fluval
- E Series Advanced Electronic Aquarium Heater instructions (E50/E100/E200/E300), Rolf C. Hagen / Fluval
- Mini Heater product page, Aqueon
- Pro Adjustable Heater product page, Aqueon
- Aquarium Mini Portable Heater (HG031) product page, hygger
- HT Submersible Heaters product page, Tetra
This page is research-based: we have not tested the equipment or methods ourselves. It draws on the sources listed and established hobby practice.
Keep reading
How to Set Up Your First Planted Aquarium
A calm, step-by-step plan for a first planted tank: choosing the tank, easy plants, equipment, substrate, planting, cycling, and the first month.
How to Set Up a Planted Nano Tank
How to set up a planted nano tank of roughly 2 to 10 gallons: scaled-down equipment, small plants, suitable livestock, and a steady maintenance routine.
A Planted Tank Maintenance Routine
A practical weekly and monthly maintenance routine for low-tech and CO2 planted tanks: water changes, trimming, filters, fertilizers, testing, and equipment.