---
product_id: 6549137
title: "Marina Betta Fish 8W Submersible Heater - For Fish Tank Aquariums up to 1.5 US Gallons (5 L)"
brand: "marina"
price: "₨704"
currency: SCR
in_stock: true
reviews_count: 8
category: "Marina"
url: https://www.desertcart.sc/products/6549137-marina-betta-fish-8w-submersible-heater-for-fish-tank-aquariums
store_origin: SC
region: Seychelles
---

# 8W power for precise heating Submersible design for full water immersion Durable polymer casing, tougher than glass Marina Betta Fish 8W Submersible Heater - For Fish Tank Aquariums up to 1.5 US Gallons (5 L)

**Brand:** marina
**Price:** ₨704
**Availability:** ✅ In Stock

## Summary

> 🔥 Keep your betta thriving in style — small heater, big impact! 🐟

## Quick Answers

- **What is this?** Marina Betta Fish 8W Submersible Heater - For Fish Tank Aquariums up to 1.5 US Gallons (5 L) by marina
- **How much does it cost?** ₨704 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sc](https://www.desertcart.sc/products/6549137-marina-betta-fish-8w-submersible-heater-for-fish-tank-aquariums)

## Best For

- marina enthusiasts

## Why This Product

- Trusted marina brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Built to Last:** Durable polymer exterior resists cracks and breaks, ensuring long-term reliability beyond traditional glass heaters.
- • **Compact Powerhouse:** 8-watt heater engineered for small tanks up to 1.5 gallons—perfect for your betta’s cozy habitat.
- • **Effortless Installation:** Includes suction cups for quick, secure mounting on your aquarium wall—no tools, no hassle.
- • **Optimize with Accessories:** Pair with Marina Standing Thermometer and a timed outlet for precise, safe temperature management—because your betta deserves the best.
- • **Smart Temperature Control:** Automatically maintains preset water temperature, creating the ideal environment for vibrant, healthy bettas.

## Overview

The Marina Betta Fish 8W Submersible Heater is a compact, durable polymer heater designed specifically for aquariums up to 1.5 gallons. It automatically maintains a preset temperature to create optimal living conditions for bettas. Easy to install with suction cups, it pairs perfectly with a thermometer and timed outlet for safe, precise temperature control, ensuring your betta stays active, healthy, and vibrant.

## Description

The Marina Betta Heater is an automatic, submersible water heater that creates ideal water conditions for bettas to thrive in. The exterior is made of durable polymer, which is more resilient than traditional glass sleeve heaters. The fish aquarium heater is designed to reach and maintain a set temperature for your aquarium water; no manual adjustments required. It has a red indicator light that illuminates when the heater is working. It comes with a suction cup, so you can easily install it against the aquarium window. For more fish tank accessories check out the other Marina products including aquarium filters, filter media, aquarium heaters, aquarium air pumps, aquarium lights, aquarium thermometer, aquarium gravel, aquarium decorations, betta fish accessories, betta fish food, aquatic fake plants, betta tanks, and aquarium stands. Marina has a wide variety of products that are perfect for your pet fish or betta fish to enjoy in any large fish tank, small fish tank, freshwater tank or a saltwater tank.

Review: Perfect little heater,few pointers PLEASE READ - I was very iffy about getting a heater for my betta as I did not want to deal with the nightmare of it cooking my betta which I always worried about. I have my betta in a 2 gallon glass bowl and despite keeping him in the warmest room in our house during the winter and the room being very small. Despite all this his water was so chilly and he was very inactive and not eating much (my betta was always very active and very curious and very hungry). I decided I needed to get a heater and this heater being very small (so as to not take up much room) and being specifically for bettas I figured I'd give it a try. The water is now a toasty 79 degrees and my betta is once again very active, very healthy, and his colors are brighter and his fins flaied out. It took him just a few days to perk up and get back to his normal self after putting in the heater. Now, PLEASE READ THE FOLLOWING. These are very important points. 1. Use a thermometer. I used this one: Marina Floating Thermometer with Suction Cup . I got it off desertcart and it is small, does not take up much room (just the bottom needs to be subermged) and is accurate. YOU MUST HAVE A THERMOMETER. I highly recommend that one. 2. DO NOT USE THIS IN A 1/2 BOWL. Despite it saying it can be used for this in the directions do NOT use this. It will heat the water up wayyy too much and cook your fish. If you are using a half a gallon bowl I am begging you to please upgrade to at least a one gallon bowl. A betta can barely turn a 360 in a half a gallon bowl and they need exercise to stay healthy and well. I recommend at least a two gallon bowl/tank. They are very cheap off desertcart OR go to your local craft store and combined with a coupon you can get a glass bowl in 2 or 3 or 1 gallon for less than 10 dollars (check out michaels!), very cheap and your betta will be much happier and you don't have to worry about the cost. 3. IF you are using a 1 gallon or 1.5 gallon bowl/tank get a wall timer and set it so that it goes on and off every hour (1 hour on 1 off 1 on etc.). It will get too hot if you do not do this. This works perfectly with my 2 gallon bowl/tank and it would work up to a 3 gallon tank/bowl (ignore the directions) but I wouldn't use it for more than 3 gallons. The way you clean it is to soak it for about 15 minutes or more in a mixture of vinegar and water. Do NOT use soap on it or on anything you put in your fish tank. Soap leaves a residue that will make your fish sick. Using a small amount of vinegar and hot water to clean things works well. When you first put the heater in the bowl/tank wait 20 min before turning on to allow the heater to adjust to the current water temperature and make sure when removing it to unplug it and then leave sometime for it to cool off. To be noted it took about 5-6 hours for the heater to bring my 2 gallons of water to its set 79 degrees. I really recommend this heater and it works perfectly for me. The only complaint I would have is that it is a very small heater and $15 is a little pricey. I have gotten heater for 10 gallon tanks for cheaper. Good product.
Review: Perfect for my 1-gallon tank, but you NEED a timed-outlet and thermometer! - This heater is excellent! I've used it for 3 months now. I have a 1 gallon tank and it works great with my beta. He loves it and rests atop it whenever he wants to get warmer. ***Important things to know:*** This heater does NOT shut off by itself. It says it will reach a preset temperature, but it means the HEATER will set to a temperature, NOT THE WATER! I learned this from another review. This means your water can get hotter and hotter and boil your fish without supervision! WHAT TO DO: I bought a simple $12 timed plug-in safety outlet that has options for 1 hour, 2 hours, 4 hours, or 8 hours. (Simple Touch C30004 the original Auto Shut-Off Safety Outlet, Multi Setting) You also must buy a thermometer! I bought this little one for $2.50 (Marina Floating Thermometer with Suction Cup). The thermometer has an easy to read green range from 70-80 degrees F, which is safe for most fish. Betas like it closer to 80 degrees. My average room temperature is usually around 72 degrees, and the 4-hour setting on my timed outlet always brings the temperature right up to 80 when I see that it's dropped to around 70. I would NEVER recommend using the 8-hour setting on the outlet, but the 4-hour setting is usually perfect to raise the temperature about 10 degrees, and the 2-hour setting will raise the temperature about 5 degrees. (Adjust depending on your own average room temperature) Together, all three of these things have kept my beta happy, warm, and healthy! The only downside (besides the heater requiring a timed-outlet) would be that I think my beta lost some of his tail due to frequent resting above the heater. He's just fine, but his tail looks kind of torn and I thought it may have been due to the heater. Good luck!

## Features

- 8-watt submersible fish tank heater for aquariums up to 1.5 gallons (5 L)
- Creates ideal conditions for bettas to live in
- Made of durable polymer, which is tougher than glass
- Easy to install in your betta fish tank; use the suction cups to place on the side of the betta tank
- Automatically reaches set temperature; allowing you to easily maintain your fish aquarium
- Use in combination with the Marina Standing Thermometer (sold separately) for accurate temperature readings

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00AE23Z88 |
| ASIN  | B00AE23Z88 |
| Best Sellers Rank | #97,698 in Pet Supplies ( See Top 100 in Pet Supplies ) #229 in Aquarium Heaters |
| Brand | Marina |
| Brand Name | Marina |
| Care Instructions | Hand Wash |
| Color | Black |
| Customer Reviews | 4.2 4.2 out of 5 stars (3,825) |
| Date First Available | November 20, 2012 |
| Date First Available  | November 20, 2012 |
| Department | unisex-adult |
| Department  | unisex-adult |
| Global Trade Identification Number | 00015561111829 |
| Included Components | Marina Betta Fish 8W Submersible Heater - For Fish Tank Aquariums up to 1.5 US Gallons (5 L) |
| Is Discontinued By Manufacturer  | No |
| Item Dimensions LxWxH | 1.7 x 5.3 x 7.1 inches |
| Item Length | 7.1 Inches |
| Item Package Dimensions L x W x H | 7.05 x 4.96 x 2.95 inches |
| Item Weight | 6 ounces |
| Item model number | 11182 |
| Item model number  | 11182 |
| Manufacturer | Rolf C. Hagen (USA) Corp. |
| Manufacturer  | Rolf C. Hagen (USA) Corp. |
| Material | Plastic |
| Model Name | Marina Betta Fish 8W Submersible Heater - For Fish Tank Aquariums up to 1.5 US Gallons (5 L) |
| Number of Items | 1 |
| Product Dimensions  | 1.7 x 5.3 x 7.1 inches; 6 ounces |
| Size | Compact |
| Target Audience Keyword | fish |
| UPC | 015561111829 |
| Voltage | 110 Volts |
| Warranty Description | Warranty |
| Wattage | 8 watts |

## Product Details

- **Brand:** Marina
- **Color:** Black
- **Item Length:** 7.1 Inches
- **Material:** Plastic
- **Voltage:** 110 Volts

## Images

![Marina Betta Fish 8W Submersible Heater - For Fish Tank Aquariums up to 1.5 US Gallons (5 L) - Image 1](https://m.media-amazon.com/images/I/61jO9JRRZQS.jpg)

## Questions & Answers

**Q: Does this heater keep stable temperature? I've heard horror stories about preset heaters cooking the betta because temp went way too high .**
A: No, probably not in the sense you mean.  This is an eight watt "always on" type of heater, it has no thermostat.  The heater will continue to emit eight watts worth of heat whenever it is plugged in.  With very few exceptions all small "bowl" or "betta" heaters work this way, the only difference is the wattage.  They are available in 5 to 15 watts, you need to match tank size, ambient temperature, and other variables to heater wattage.  A thermometer and monitoring is essential, especially at first to determine what temperature a particular heater keeps a particular tank, and if room temperature rises so will the water temperature.  The term "preset" is not really applicable to these heaters, preset heaters have a thermostat that is permanently set at a certain temperature.   If a heater description uses the term preset without stating a specific temperature (usually 78°) then it is NOT a thermostatic heater- it is an always on type.  In too small of a tank or too warm a room these can overheat the water.  Bettas are very heat tolerant, which is why using these heaters is feasible, but care is still needed.  In anything under 3 gallons I think eight watts may be more than needed unless in a fairly cool room.

**Q: Is there any reason that I couldn't use this outside to keep a dog's water bowl from freezing?**
A: To answer the original question....it depends on how low the temp dips, but I would say no.  I've tried several different "devices" to keep water from freezing in cold MN winters, and most of them will fail if it gets much below 0.  I'd do a search for devices that are especially made for the purpose you have.  Some are quite inexpensive, and if your temps aren't too cold, will work fine, at least most of time.  The only thing that works well enough to be dependable for me are heated pails, and the pail has to be pretty big, 2 to 3 gal capacity (and kept full or near full of water) to keep the liquid contents from freezing when it gets really cold.  (These are the pails I have, except they're blue.  I've had them for more than 10 yrs, they still work and look like new, but I ONLY use them in the winter months, they're put away and not used at all over the summer.  I believe I pd about $30/ea at that time, so they've never been "cheap". https://www.amazon.com/Farm-Innovators-FB-80-Heated-Bucket/dp/B01I5JP69M/ref=sr_1_2?ie=UTF8&qid=1501103428&sr=8-2&keywords=heated+livestock+bucket.       I've also taken a 5 gallon pail, cut it in half, wrapped a heat tape around the lower part of the pail, taped it in place so the tape doesn't touch itself, put the upper part of the pail over that lower half, thereby covering the heat tape on the bottom half and making it inaccessible and preserving the handle on the upper half for carrying.  Then, tape the whole thing together using strong, outdoor weatherproof tape or some other means of keeping the contraption together......Viola, a 2 1/2 gallon DIY heated pail. Those worked quite well, kept the water from freezing but didn't warm the water and usually lasted as long as the heat tape did, several years if you only used them in the winter months.  Since you usually have a good supply of 5 gal pails around the farm and you only needed a short heat tape, they weren't expensive to make, especially important if you had need of several pails.  However, a decent heat tape isn't so inexpensive anymore nor do they seem to last as long.  That, plus getting older and lazier, are the reasons we now use store-bought, ready-made heated pails.)  These pails are not ideal, either, because they do such a good job, they actually warm the water, not hot, not even close, just lukewarm.  While one would think that's a good thing for the dogs....warm water on a cold day....they don't like the water to be warm. They much prefer their water to be cold but do drink it warm when that's the only option. Spoiled, fussy little buggers!

**Q: Would this be okay for a very small tank that only holds 10oz-12oz water?**
A: The heater is very small, but I'm not sure how big a tank that size looks. The heater is about 4 inches long and 2 inches wide.

**Q: It seems my heater in our 1/2 gallon tank is going up to 85 degrees. Is that too hot?**
A: Ideal water temp for bettas is between 78 and 80 degrees. Not 85...so ignore the people saying that's fine.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Perfect little heater,few pointers PLEASE READ
*by S***E on December 28, 2013*

I was very iffy about getting a heater for my betta as I did not want to deal with the nightmare of it cooking my betta which I always worried about. I have my betta in a 2 gallon glass bowl and despite keeping him in the warmest room in our house during the winter and the room being very small. Despite all this his water was so chilly and he was very inactive and not eating much (my betta was always very active and very curious and very hungry). I decided I needed to get a heater and this heater being very small (so as to not take up much room) and being specifically for bettas I figured I'd give it a try. The water is now a toasty 79 degrees and my betta is once again very active, very healthy, and his colors are brighter and his fins flaied out. It took him just a few days to perk up and get back to his normal self after putting in the heater. Now, PLEASE READ THE FOLLOWING. These are very important points. 1. Use a thermometer. I used this one: Marina Floating Thermometer with Suction Cup . I got it off amazon and it is small, does not take up much room (just the bottom needs to be subermged) and is accurate. YOU MUST HAVE A THERMOMETER. I highly recommend that one. 2. DO NOT USE THIS IN A 1/2 BOWL. Despite it saying it can be used for this in the directions do NOT use this. It will heat the water up wayyy too much and cook your fish. If you are using a half a gallon bowl I am begging you to please upgrade to at least a one gallon bowl. A betta can barely turn a 360 in a half a gallon bowl and they need exercise to stay healthy and well. I recommend at least a two gallon bowl/tank. They are very cheap off amazon OR go to your local craft store and combined with a coupon you can get a glass bowl in 2 or 3 or 1 gallon for less than 10 dollars (check out michaels!), very cheap and your betta will be much happier and you don't have to worry about the cost. 3. IF you are using a 1 gallon or 1.5 gallon bowl/tank get a wall timer and set it so that it goes on and off every hour (1 hour on 1 off 1 on etc.). It will get too hot if you do not do this. This works perfectly with my 2 gallon bowl/tank and it would work up to a 3 gallon tank/bowl (ignore the directions) but I wouldn't use it for more than 3 gallons. The way you clean it is to soak it for about 15 minutes or more in a mixture of vinegar and water. Do NOT use soap on it or on anything you put in your fish tank. Soap leaves a residue that will make your fish sick. Using a small amount of vinegar and hot water to clean things works well. When you first put the heater in the bowl/tank wait 20 min before turning on to allow the heater to adjust to the current water temperature and make sure when removing it to unplug it and then leave sometime for it to cool off. To be noted it took about 5-6 hours for the heater to bring my 2 gallons of water to its set 79 degrees. I really recommend this heater and it works perfectly for me. The only complaint I would have is that it is a very small heater and $15 is a little pricey. I have gotten heater for 10 gallon tanks for cheaper. Good product.

### ⭐⭐⭐⭐⭐ Perfect for my 1-gallon tank, but you NEED a timed-outlet and thermometer!
*by A***R on March 8, 2017*

This heater is excellent! I've used it for 3 months now. I have a 1 gallon tank and it works great with my beta. He loves it and rests atop it whenever he wants to get warmer. ***Important things to know:*** This heater does NOT shut off by itself. It says it will reach a preset temperature, but it means the HEATER will set to a temperature, NOT THE WATER! I learned this from another review. This means your water can get hotter and hotter and boil your fish without supervision! WHAT TO DO: I bought a simple $12 timed plug-in safety outlet that has options for 1 hour, 2 hours, 4 hours, or 8 hours. (Simple Touch C30004 the original Auto Shut-Off Safety Outlet, Multi Setting) You also must buy a thermometer! I bought this little one for $2.50 (Marina Floating Thermometer with Suction Cup). The thermometer has an easy to read green range from 70-80 degrees F, which is safe for most fish. Betas like it closer to 80 degrees. My average room temperature is usually around 72 degrees, and the 4-hour setting on my timed outlet always brings the temperature right up to 80 when I see that it's dropped to around 70. I would NEVER recommend using the 8-hour setting on the outlet, but the 4-hour setting is usually perfect to raise the temperature about 10 degrees, and the 2-hour setting will raise the temperature about 5 degrees. (Adjust depending on your own average room temperature) Together, all three of these things have kept my beta happy, warm, and healthy! The only downside (besides the heater requiring a timed-outlet) would be that I think my beta lost some of his tail due to frequent resting above the heater. He's just fine, but his tail looks kind of torn and I thought it may have been due to the heater. Good luck!

### ⭐⭐⭐⭐ Good product, misleading description..
*by W***E on June 27, 2013*

I would have rated this heater 5 stars had the company not put so much thought into a deliberately deceptive, albeit technically accurate description. First, and most important to realize, is that this is an always on heater. It has no thermostat, it simply warms up and stays warm all the time. So the statement that it "reaches a preset temperature" is extremely misleading since most will interpret that to mean the water temperature, when in fact it's the HEATER temperature that remains constant. Whether or not it keeps a bowl/tank at a desired temperature depends on the tank size/water volume, temperature of the room, amount of water circulation/movement, other heat sources such as a light being on or off, lid or no lid, acrylic or glass container, heater placement, and so on. All small "Betta" or "bowl" heaters work this way. This is an 8 watt heater. These heaters usually run between 7.5 to 15 watts. If you have need of the higher wattage, it's much better to use two 7.5 than one 15 watt. That way just one can be unplugged if the water temp is too high, giving you a bit more flexibility. They can be safely buried in the substrate, a nice option in some set-ups. This particular heater has a small red LED, which the description states is lit "when the heater is working" a technically accurate but also deceptive statement. It should more truthfully state that the light is lit whenever the heater is plugged in, rather than give the impression the light, and therefore the heater, will cycle on and off. Rest assured, it won't. No matter the temperature of the water, the heater will emit 8 watts worth of heat anytime it is plugged in. Using this type of heater requires careful and ongoing monitoring. An accurate thermometer is a must. You cannot rely on charts/claims as to how many degrees a specific size heater will raise the temperature in a specific size tank, there are far too many variables. Still, these little units can be quite effective, and I do like this one quite a bit. The LED light, though possibly intended as more a marketing ploy than anything else, is actually a nice feature since there may be times you will unplug the heater and it's easy to forget to reconnect ones with no such indicator. The weight is nice, it tends to stay where it's put, thinner/lighter models are easily displaced. On identical tanks they seem to be very consistent. It is entirely possible to seriously overheat a bowl or small tank using this type of heater. That is not a malfunction, it is simply an inherent risk with any always on heater. If the room gets warmer, the water will as well. These heaters do not adjust for any variable, they simply continue to emit the same amount of heat no matter what. That is what most people having problems with them don't realize, and what the cleverly worded descriptions fail to make clear. When the room temperature changes, so does the tank temperature. These heaters merely keep a small volume of water a few degrees warmer than it would be without it. They do not and cannot maintain any tank at a specific temperature, ignore claims of "maintains ideal temperature" as they are patently false. The aquarist has to be the thermostat by matching tank size to heater size (wattage) and continually monitoring fluctuations due to changing room temperature and other variables. These heaters are not for overly sensitive species, but it is probably far better for a Betta to be in water that fluctuates between 75° and 85° than in unheated water fluctuating between 65° and 75°. Bettas are heat loving fish and quite tolerant of even very high temps, which makes using this type of heater less risky but still not foolproof. For around $20 or more, a heater controller can be attached. I have a rack of 9 identical small tanks w/9 of these heaters connected to one power strip that is plugged into a single controller set at 82°. The probe for the controller is in one of the 9 tanks, and this works fine, keeping all of them a steady 82°. A less expensive solution though somewhat less exact, is to purchase a stand alone *dimmer switch (the type with the plug, about $10). You can then do rather fine adjustments usually with a slide, up or down as the temp fluctuates. I have this heater on a one gallon Marina Cubus with dwarf shrimp and a dimmer and that works well. As I stated at the start, the actual heater is nice quality and has proved quite consistent from one unit to another. It performs exactly as it should, and the limitations are not flaws, just inherent with what it is. I'm not certain why the description only rates this 8 watt heater for up to 1.5 gallon tanks, but it's relatively meaningless in any case. Some of the 7.5 watt models are recommended for tanks "up to 5 gallons" which is no more valid- it depends entirely on the sum of all the variables in each individual situation. My only real problem is with what I consider deliberate marketing tactics meant to mislead a purchaser into believing the product is, or can perform, as something it isn't. A clear explanation of just how the unit really works is needed, especially if the company wants to be held blameless for problems caused by misuse. *If interested, I also review the dimmer switch I use.

## Frequently Bought Together

- Marina Betta Fish 8W Submersible Heater - For Fish Tank Aquariums up to 1.5 US Gallons (5 L)
- Ultra Fresh Betta Fish Food, Pro Shrimp Patties, 50% Sword Prawns + Akiami Paste Shrimps, All Natural Protein, Rich in Calcium, for Betta's Healthy Development and Cleaner Water, 0.7 oz
- Aqueon Aquarium Fish Tank Betta Bowl Plus Water Conditioner, 4 Ounce

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*Product available on Desertcart Seychelles*
*Store origin: SC*
*Last updated: 2026-03-05*