Sized for a 5 gallon tank
| Model | Rated for | Power | Length |
|---|---|---|---|
| hygger Digital Mini Heater 25W Adjustable, electronic · Its 25 W is under the 50 W both charts give, so it may not hold 78 °F unless the room stays warmer than 70 °F. | 0.4–5.3 gal | 25 W | Not published |
| Aqueon Aquatic Flat Heater 15 W Flat · Rated 5–10 gal, but it has no temperature to set and adds up to 6 °F to the room, so it reaches 78 °F only in a room of 72 °F or warmer. | 5–10 gal | 15 W | Not published |
| hygger Precise Aquarium Heater 50W Adjustable, electronic | 5–10 gal | 50 W | 5.9 in |
| Tetra HT10 Preset | 2–10 gal | 50 W | Not published |
| hygger Digital Mini Heater 50W Adjustable, electronic | 0.4–11.9 gal | 50 W | Not published |
| Fluval M50 Adjustable submersible | Up to 15 gal | 50 W | 11 in |
| hygger Digital Mini Heater 75W Adjustable, electronic | 0.4–15.9 gal | 75 W | Not published |
| Aqueon Pro 50 Adjustable, electronic | Up to 20 gal | 50 W | 9 in |
| Aqueon Submersible Glass Heater 50 W Adjustable submersible | Up to 20 gal | 50 W | 8.75 in |
| Aqueon Preset Heater 50 W Preset | Up to 20 gal | 50 W | Not published |
| Cobalt Aquatics Neo-Therm Pro 100W Adjustable, electronic | Up to 29 gal | 100 W | 9.75 in |
| Fluval E100 Adjustable, electronic | Up to 30 gal | 100 W | 11.75 in |
| Fluval M100 Adjustable submersible | Up to 30 gal | 100 W | 11 in |
| Aqueon Preset Heater 100 W Preset | Up to 30 gal | 100 W | Not published |
| Aqueon Submersible Glass Heater 100 W Adjustable submersible | Up to 40 gal | 100 W | 10.325 in |
The charts are for an average room. In a colder room, or a tank without a lid, work out your own figure in the heater size calculator; for a warmer one, the smaller heaters here are enough.
Rated for it, but more than it needs
These cover 5 gallons, but they are much more powerful than the makers’ charts ask for. If its thermostat sticks on, an oversized heater overheats the water faster.
- Fluval M150: Rated up to 45 gal, but its 150 W is more than twice the 50 W the makers’ charts give for 5 gallons.
- Aqueon Pro 150: Rated up to 55 gal, but its 150 W is more than twice the 50 W the makers’ charts give for 5 gallons.
- Aqueon Submersible Glass Heater 150 W: Rated up to 55 gal, but its 150 W is more than twice the 50 W the makers’ charts give for 5 gallons.
- Aqueon Preset Heater 150 W: Rated up to 55 gal, but its 150 W is more than twice the 50 W the makers’ charts give for 5 gallons.
- Fluval E200: Rated up to 65 gal, but its 200 W is more than twice the 50 W the makers’ charts give for 5 gallons.
- Fluval M200: Rated up to 65 gal, but its 200 W is more than twice the 50 W the makers’ charts give for 5 gallons.
- Aqueon Pro 200: Rated up to 75 gal, but its 200 W is more than twice the 50 W the makers’ charts give for 5 gallons.
- Aqueon Submersible Glass Heater 200 W: Rated up to 75 gal, but its 200 W is more than twice the 50 W the makers’ charts give for 5 gallons.
- Aqueon Preset Heater 200 W: Rated up to 75 gal, but its 200 W is more than twice the 50 W the makers’ charts give for 5 gallons.
- Fluval M300: Rated up to 80 gal, but its 300 W is more than twice the 50 W the makers’ charts give for 5 gallons.
- Aqueon Pro 300: Rated up to 100 gal, but its 300 W is more than twice the 50 W the makers’ charts give for 5 gallons.
- Aqueon Submersible Glass Heater 300 W: Rated up to 100 gal, but its 300 W is more than twice the 50 W the makers’ charts give for 5 gallons.
- Fluval E300: Rated up to 100 gal, but its 300 W is more than twice the 50 W the makers’ charts give for 5 gallons.
Not for a 5 gallon tank
- hygger Digital Mini Heater 15W: Rated 0.4–2.64 gal: too small for 5 gallons.
- Aqueon Aquatic Flat Heater 7.5 W: Rated 1–3 gal: too small for 5 gallons.
- EHEIM thermocontrol 25: Rated 5.2–6.6 gal: built for bigger tanks than 5 gallons.
- hygger Titanium Tube Heater 50W: Rated 10–15 gal: built for bigger tanks than 5 gallons.
- EHEIM thermocontrol 50: Rated 6.6–15.8 gal: built for bigger tanks than 5 gallons.
- hygger Precise Aquarium Heater 100W: Rated 10–20 gal: built for bigger tanks than 5 gallons.
- hygger Titanium Tube Heater 100W: Rated 15–20 gal: built for bigger tanks than 5 gallons.
- EHEIM thermocontrol 75: Rated 15.8–26.4 gal: built for bigger tanks than 5 gallons.
- Tetra HT30: Rated 10–30 gal: built for bigger tanks than 5 gallons.
- EHEIM thermocontrol 100: Rated 26.4–39.6 gal: built for bigger tanks than 5 gallons.
- Aqueon Pro 100: Rated 15–40 gal: built for bigger tanks than 5 gallons.
- hygger Precise Aquarium Heater 200W: Rated 20–40 gal: built for bigger tanks than 5 gallons.
- hygger Titanium Tube Heater 200W: Rated 30–40 gal: built for bigger tanks than 5 gallons.
- Tetra HT40: Rated 30–40 gal: built for bigger tanks than 5 gallons.
- EHEIM thermocontrol 125: Rated 39.6–53 gal: built for bigger tanks than 5 gallons.
- Tetra HT55: Rated 40–55 gal: built for bigger tanks than 5 gallons.
- hygger Precise Aquarium Heater 300W: Rated 40–60 gal: built for bigger tanks than 5 gallons.
- hygger Titanium Tube Heater 300W: Rated 50–60 gal: built for bigger tanks than 5 gallons.
- EHEIM thermocontrol 150: Rated 53–79 gal: built for bigger tanks than 5 gallons.
- hygger Titanium Tube Heater 500W: Rated 70–80 gal: built for bigger tanks than 5 gallons.
- hygger Precise Aquarium Heater 500W: Rated 55–100 gal: built for bigger tanks than 5 gallons.
- EHEIM thermocontrol 200: Rated 79–106 gal: built for bigger tanks than 5 gallons.
- EHEIM thermocontrol 250: Rated 106–159 gal: built for bigger tanks than 5 gallons.
- EHEIM thermocontrol 300: Rated 159–264 gal: built for bigger tanks than 5 gallons.
Before you choose
Put the heater where the filter’s flow passes it, so the warmth spreads, and check the temperature with a separate thermometer. How to size and place a heater.
Tank pages: 5 gallon: Aqueon 5½ · Filters for a 5 gallon tank →