Best 5 Watt Aquarium Heaters In January 2025

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Check out our product review of the Best 5 Watt Aquarium Heaters. We tried 10 models and can tell you the absolute best varieties.

To help you in your search, we have completed this list of the Best 5 Watt Aquarium Heaters.

Top Rated Best 5 Watt Aquarium Heaters Of 2025

Rank	Product Name	Score
1	FREESEA 25 Watt Aquarium Betta Fish Tank Heater with Aquarium Submersible Thermometer Buy Now	9.7 Buy Now
2	Orlushy Mini Aquarium Heater 50W,Small Fish Tank Heaters with LED Digital Temperature Display Buy Now	9.5 Buy Now
3	Mylivell Aquarium Heater Submersible Fish Tank Water Heater Thermostat-100W Buy Now	9.1 Buy Now
4	hygger 50W Mini Inline Quartz Glass Aquarium Heater with External Controller, Adjustable Submersible Buy Now	8.8 Buy Now
5	VIBIRIT Aquarium Heater,Betta Fish Tank Heater 25W Smart Small Aquarium Heater,Energy Efficient Submersible Buy Now	8.6 Buy Now
6	hygger Mini Glass Aquarium Heater Adjustable LED Digital Temperature Display Small Tank Heater Buy Now	8.3 Buy Now
7	DaToo 10 Watt Small Aquarium Heater Mini Betta Flat Fish Tank Heater Buy Now	8.1 Buy Now
8	PGFUNNY 25w Aquarium Heater, Betta Fish Heater Adjustable LED Digital Temperature Display Smart Buy Now	7.8 Buy Now
9	FREESEA 50W Mini Aquarium Fish Tank Submersible Heater with LED Temperature Display Buy Now	7.5 Buy Now
10	SZELAM 25W Smart Mini Aquarium Heater, Betta Fish Tank Heater Thermostat Warmer Submersible Buy Now	7.2 Buy Now

1. FREESEA 25 Watt Aquarium Betta Fish Tank Heater with Aquarium Submersible Thermometer

• Satisfaction guaranteedgain the confidence to go hard with us! our aquarium heater is built with durability in mind and safety for every design, in the remote possibility that youre not satisfied with our product, just contact us, and we will gladly give you a new aquarium heater replacement. 12 month warranty and 24 hour professional after-sales service.
• Temperature range: 63f~95f , it is very easy to adjust the temperature you need, we also deliberately give each customer a free diving thermometer, you can observe the water temperature of the fish tank at any time.
• Intelligent temperature control automatic constant temperature function, when water temperature reaches to specified temperature value, heater will automatically stop heating, when water temperature is lower than the set temperature, heater will automatically start heating. furthermore, automatic safety shut-off feature, and overheating protection.
• 25 watt heater this aquarium heater is suitable for 1 to 5 gallons aquariums, length - 6.8 inch,voltage 110-120v, power cord is 4.0 ft, please choose the right wattage aquarium heater according to our size chart.
• Note: 1. aquarium heater is 100% submersible use only, during its heating time, heater must be 100% submerged into the water.,please unplug the power supply when cleaning the fish tank or aquarium water changes. 2. heater rod is suitable for people over 16 years of age. children or minors should be under adult guidance or supervision.

2. Orlushy Mini Aquarium Heater 50W,Small Fish Tank Heaters with LED Digital Temperature Display

• Applicable for freshwater and marine aquariums, aquaculture, glass containers, and hydroponic systems
• The digital smart aquarium heater is a heater and thermometer combined into one, eliminating the need for more equipment in smaller tanks.
• Led display design: led digital display, external temperature controller,easy to use and safety.
• 50w submersible aquarium heater is suitable for 3-15 gallon.temperature range: 65f~93f18c~34c, power cord is 5 ft.
• Please be sure that the heater needs to be completely sunk into water, horizontal or vertical fixed in the water cycle better place, and let the working light can be seen as clear as possible.

3. Mylivell Aquarium Heater Submersible Fish Tank Water Heater Thermostat-100W

• Convenient and safe: our aquarium heater thermostat has two suction cups for attachment to the fish tank. the polarized plug prevents electrical shock.
• Adjustable temperature: the temperature of the fish tank heater can be adjusted automatically. temperature setting range: 20~34c(65 f - 93 f), and the display is easy to read.
• Both suiting for fresh or saltwater aquariums, provide a constant warm environment for your tropical fish to stay healthy.
• Fully submersible. power: 100w. suggested water volume: 20 gal.
• High quality: aquarium heater made of high quality quartz glass, double seal material , advanced design, ensures safe operation.

4. hygger 50W Mini Inline Quartz Glass Aquarium Heater with External Controller, Adjustable Submersible

• Durable quartz glassthis aquarium heater tube is heat-resistant quartz glass made, excellent in explosion-proof, can be used in fresh water and salt water aquariums, white alundum sand as the heat-conducting media, service life can be 3 years or more
• Fully submersiblethis fish tank heater is waterproof, must be fully submerged in water when working, place it horizontally or vertically near the water intake or where the way of water flow
• For fish tank 5-15 gallon50w aquarium heater, voltage ac110-120v 60hz, power cord is 4.6ft. heater rod length is 5 inch, mini compact heater for small fish tank use. perfect for betta tank. a very compact heater, easy to hide in the tank
• Automatic stop & restarteffectively maintain the tank water in the constant temp you set, stop heating when water temp reaches to the set temp and restart heating when the water temp is 1-2 below the set temp.the indicator light on the controller will be on red when it's heating, will be off when it stop heating
• With built-in thermometeryou can set the the temp from 68 to 90,temp exactness is within 2 degrees in fahrenheit. there is a built-in thermometer in the heater to detect the water temp, not need to buy seperate thermometer

5. VIBIRIT Aquarium Heater,Betta Fish Tank Heater 25W Smart Small Aquarium Heater,Energy Efficient

• 25w fish tank heater is suitable for 3 to 5 gallons and can be used in mini fish tanks and aquariums. the super-designed suction cups hold the heater tightly in the aquarium. easy to hide in the water tank.
• Included temperature sticker: you can attach the temperature sticker to the surface of the water tank, through which you can monitor. the easy-to-recognize blue color indicates the current temperature of your aquarium water. temperature bar is for reference only
• Advanced materials: sturdy engineering plastic. it has anti-explosion, anti-scalding function, high temperature resistance and high safety. suitable for aquarium pets such as turtles and fry. length - 5.35 inch, width - 0.9inch, thickness - 0.63inch.
• Fully automatic temperature control chip:vibirit submersible aquarium heater automatically adjusts the temperature between 75f and 82f (24c to 28c). it is different from the traditional manual adjustment of the aquarium heater and does not need to be set. and will automatically turn on/off to achieve the setting temperature constantly and stably, energy-efficient.
• Parameters and quality assurance: working power 25w, frequency: 50/60hz, voltage: 110-120v, waterproof rating ip68. this product aquarium heater has passed ce, rohs, fcc certification. explosion-proof, waterproof, anti-scalding, high temperature and other safe operation.

6. hygger Mini Glass Aquarium Heater Adjustable LED Digital Temperature Display Small Tank Heater

• Easy to read led displayexternal temperature setting control avoids getting hands wet, digital led display shows real time water temperature. heating temperature range from 63 to 94f. control accuracy is +/- 1f.
• Run dry protectionthis egg-shaped small aquarium heater automatically shut itself off once it remove from water which ensures the safety of your pet, especially turtle and frog
• For fish tank 1-6.5 gallon50 watt aquarium heater is ideal for small fish bowls and aquariums 1 to 6.5 gallons, voltage/frequency: 110 120volt/60hertz, it is ideal for betta fish and turtle tank
• Protective guardmade of high quality quartz glass, waterproof double seal material, covered with protective case, shatter-resistant construction, this fish tank heater keep your fish from scalding and punching
• Automated shut off systemonce set the desired temperature, this fully submersible heater lights on red indicates that it is heating. it will auto shut off once it reach set temperature

7. DaToo 10 Watt Small Aquarium Heater Mini Betta Flat Fish Tank Heater

• 24v safe voltage & power off after leaving water - the output voltage of the datoo betta heater is only 24v, which not only ensures the safety of the fish, but also ensures the safety of the user. no need to worry about leakage, you can rest assured to use it for your children. the betta heater needs to be completely submerged in the water. if it leaves the water, it wi...
• Constant temperature & no need to adjust - datoo 10w mini aquarium heater can automatically maintain a constant temperature between 75f and 82f (depending on the external environment), no need to set. this temperature range is ideal for most tropical fish and is very beneficial for the reproduction of betta and promotes their metabolism. with no extra work, just plug ...
• Perfect mini heater for 1~1.5 gallon tank - for a betta breeder with a 1 to 1.5 gallon small tank, it is very difficult to choose a suitable heater. because most of the heaters on the market are too big for this small tank. this not only affects us to watch our beautiful betta, but also reduces the activity space of the betta. now datoo mini aquarium heater can help you...
• Attention & one year warranty - this is 10w mini aquarium heater, size is 3*2*0.26 inch, fit 1~1.5 gallon small tank. only for fresh water tanks. one year warranty and 100% money-back guarantee. buy datoo products with confidence. just do it, lett go!!
• Ptc heating & only suitable for freshwater - unlike conventional glass aquarium heaters, ptc has better thermal conductivity and heating rate, no explosion, no breakage. very energy efficient and environmentally friendly. your child can operate it easily and is very safe. this mini fish tank heater is only suitable for fresh water tanks.

8. PGFUNNY 25w Aquarium Heater, Betta Fish Heater Adjustable LED Digital Temperature Display Smart

• Suitable for 3-5 gallon tank: fish tank heater 25 watt powerful and slim design fit for small fish tank. the way of measure watt heater for your fish tank needing: watt=(tank's length*wide*water height) /1000*2.
• Advanced materials: sturdy engineering plastic. it has anti-explosion, anti-scalding function, high temperature resistance and high safety. suitable for aquarium pets such as turtles and fry. length - 5.35 inch, width - 0.9inch, thickness - 0.63inch.
• Fully automatic temperature control chip: submersible aquarium heater works in intermittent operation mode,temperature regulate between on 77 - 82, unlike the traditional manually adjusted fish tank heaters, no need to set. and will automatically turn on/off to achieve the setting temperature constantly and stably, energy-efficient.
• Quality assurance: this product fish tank heater have certificated by ce, rohs, fcc certifications. anti-explosion, waterproof, scald-preventing, safe operation for pet betta fish.working power 25w, frequency: 50/60hz, voltage: 110-120v, waterproof rating ip68.
• Come with thermometer strips: by using this thermometer strips, you will be able to monitor. an easy to identify blue color shows the current temperature of your aquarium water. temperature strips is for reference only.

9. FREESEA 50W Mini Aquarium Fish Tank Submersible Heater with LED Temperature Display

• Automatic constant temperature function, when water temperature reaches to specified temperature value, heater will automatically stop heating, when water temperature is lower than the set temperature, heater will automatically start heating.
• Satisfaction guaranteedgain the confidence to go hard with us! our aquarium heater is built with durability in mind and safety for every design, in the remote possibility that youre not satisfied with our product, just contact us, and we will gladly give you a new aquarium heater replacement. 12 month warranty and 24 hour professional after-sales service.
• Touch button, cyclic adjust temperature , easy to use and safety.
• Note:this heater is 100% submersible use only, during its heating time, heater must be 100% submerged into the water.
• Temperature range: 59f~94f, display fahrenheit f, this heater is designed for1~10 gallons tank.

10. SZELAM 25W Smart Mini Aquarium Heater, Betta Fish Tank Heater Thermostat Warmer Submersible

• Easier to use- szelam mini heater different from a manually adjusted heater. our heater automatic temperature regulate on 73f-82f(25-28) , no need to set. prevent electric shock and burns. keep you and your family safe. position it near a strong water flow for whole aquarium are in the same temperature. the outlet of filter is ideal.
• Mini sized- fully submersible compact betta fish heater gift with 2pcs aquarium decor artificial plant. specific perfect for mini aquarium under 5 gal/20l. szelam mini heater provide a constant warm for your pet fish to stay healthy, suitable both for fresh and salt water.
• Quality assurance- this product have certificated by ce, rohs, fcc certifications. we provide 1 year quality assurance for this product, we will provide replacement items for any product problems within 1 year after your purchase it.
• High quality- made by heat resistant abs housing, sandy quartz filler and mch alumina ceramic heating system, anti explosion & cracking, it is scald-preventing for your pets and safe operation for you, safer and more stable to use.
• Smart control- adopted intelligent circuit board, with a precise temperature sensing probe and constant temperature heating system. no thermometer required, no more operations: unlike other conventional heaters, need you to manually adjust the temperature. our smart aquarium heater just plug the power cable then it will work. it works in intermittent operation mode and ...