Buy Fish Tank Heater

THEO UL Heater 25W

Theo Heater. New aquarium heater functioning with the exclusive PTC technology means that this heater will not break or damage when run out of the tank. Theo aquarium heater has all the necessary feature for safe and precise temperature maintenance of the water in your tank. The exclusive technology and the high quality of components guarantee a long lasting product.

• High resistance - the first shatter proof heater
• Shock resistant
• Position vertical, horizontal and completely submerged
• Graduated scale for precise maintenance of set temperature
• No damage in case of running dry

Rating: (out of 7 reviews)

List Price: $ 20.99
Price: $ 13.78

THEO UL Heater 25W Reviews

Review by MacGuffin:

This is a nice choice for a tank that holds up to 7 gallons. It’s totally submersible, ACCURATE, has a very effective thermostat, and is fairly unobtrusive. One feature I like is that its light glows while the water is heating and shuts off once the correct temperature has been reached. It’s a good fit for a tank such as the Eclipse 3, especially if you want to house a betta (it also works well in an Eclipse 6); the Theo allows me to acclimate new fish at 86º for a week or so to rid them of any ich they might be harboring, after which it’s easy to gradually reduce the temperature to my (and their) preferred 82º.

I also use Marineland Stealths, which I like because they’re plastic but frankly, it bears mentioning that Marineland’s “lifetime guarantee” carries an Orwellian caveat, i.e., some Stealths are more guaranteed than others. Rather than providing mail-in product registration to activate the warranty, you’re expected to hang on to your receipt…well…for a lifetime (yeah, right). In addition, if they don’t like the vendor, e.g., you bought it brand new and sealed but from an eBay or Amazon seller, you can kiss your hopes of replacement for a defective unit goodbye (they claim this is due to widespread fraud and people trying to obtain replacements for units found in the trash, but why were so many units trashed if they work forever, and who are these dementos who make a career of scavenging for them? Liver-lipped Finnish Ugly Boy trolls?). Marineland (actually, Aquarium Systems; they manufacture the item in Italy), after much coaxing, replaced a brand-new dead unit for me, but it’s only carrying a 90-day warranty; this is because I bought it on eBay and I received an e-slap to the effect that NONE of my other Internet purchases would be covered. On this basis, my suggestion is to boycott Stealths (unless you want to pay list at a pet store) and go with a Theo. They’re also manufactured in Italy, they do a great job, and I suspect they’re nicer about warranty issues.

Review by C. Huskey:

I was only hesitant to purchase this because I needed to use it for a ten gallon tank (It’s designed for a 7gal) and this was the most affordable option. I urge you to not be anxious yourself, however, as this heater is splendid. It looks reasonably nice and will heat your water (even in a ten-gallon tank); what more can I say? If you need an aquarium heater and have a 10gal, don’t sweat it. Just buy it.

Also, it’s worth mentioning that the heater doesn’t look exactly like the one in the main picture. It’s shorter and fatter (proportionately at least…) than pictured. This isn’t a bad thing. Just don’t freak out, because you ARE getting what you ordered.

Buy THEO UL Heater 25W now for only $ 13.78!

Hydor Mini Heater Aquarium Heater, 7.5 Watts

Mini Aquarium Heater helps increase by a few degrees the water temperature of mini aquariums compared to the room temperature where they are positioned. Raises temperature approximately 5 degrees Fahrenheit in a 2 gallon tank and 4 degrees Fahrenheit in a 5 gallon tank

• Compact heater for small desktop aquariums
• Safely increases water temperature by a few degrees
• Flat and easy to conceal in miniature tanks and bowls
• Completely submersible
• For tanks up to 5 gallons

Rating: (out of 33 reviews)

List Price: $ 11.99
Price: $ 8.05

Hydor Mini Heater Aquarium Heater, 7.5 Watts Reviews

Review by Brian J. Williams:

This heater works well, not bad for small tanks (5 gallons or less). I purchased this for my 1 gallon tank, and it heated the water up to the low 80s. The heater works submerged or placed under the tank. I keep my apartment on the cool side, so this heater did the trick. A word of warning, though–if you have a 1-gallon tank, make sure you have a thermometer in it, because if you keep your home temperature in the high 60s and into the 70s, chances are the heater will then heat the water too warmly, into the mid to upper 80s, at which point you’ll have to unplug the heater and monitor the temp as needed. Still, not bad for the price.

Review by M. Lee:

I bought these for my 2.5gallon killifish tanks. These heaters take up very little space in the small tanks, since they are flat.

But be aware that these heaters don’t have temperature controls, so the water temperature will change when the room temperature changes. My tank temperature ranged from 92F to 70F with the heater plugged in from May to December. I had to unplug the heaters on very hot days. It seems that these heater will raise the water temperature in a 2.5gallon thank by 8 to10F over the room temperature.

Finally, all 6 mini heaters that I own have been reliable for 8 months now, and all are consistent in how much they heat the same volume of water.

Buy Hydor Mini Heater Aquarium Heater, 7.5 Watts now for only $ 8.05!

THEO UL Heater 200W

Theo Heater. New aquarium heater functioning with the exclusive PTC technology means that this heater will not break or damage when run out of the tank. Theo aquarium heater has all the necessary feature for safe and precise temperature maintenance of the water in your tank. The exclusive technology and the high quality of components guarantee a long lasting product.

• High resistance - the first shatter proof heater
• Shock resistant
• Position vertical, horizontal and completely submerged
• Graduated scale for precise maintenance of set temperature
• No damage in case of running dry

Rating: (out of 2 reviews)

List Price: $ 26.99
Price: $ 16.95

THEO UL Heater 200W Reviews

Review by Turtle Lover:

This heater works great I have it set just a little bit higher than it’s lowest setting and it is working great. I have it in about 50 gallons of water and it handles that with no problem…

Buy THEO UL Heater 200W now for only $ 16.95!

THEO UL Heater 100W

Theo Heater. New aquarium heater functioning with the exclusive PTC technology means that this heater will not break or damage when run out of the tank. Theo aquarium heater has all the necessary feature for safe and precise temperature maintenance of the water in your tank. The exclusive technology and the high quality of components guarantee a long lasting product.

• High resistance - the first shatter proof heater
• Shock resistant
• Position vertical, horizontal and completely submerged
• Graduated scale for precise maintenance of set temperature
• No damage in case of running dry

Rating: (out of 1 reviews)

List Price: $ 22.99
Price: $ 19.99

THEO UL Heater 100W Reviews

Buy THEO UL Heater 100W now for only $ 19.99!

THEO UL Heater 50W

Theo Heater. New aquarium heater functioning with the exclusive PTC technology means that this heater will not break or damage when run out of the tank. Theo aquarium heater has all the necessary feature for safe and precise temperature maintenance of the water in your tank. The exclusive technology and the high quality of components guarantee a long lasting product.

• High resistance - the first shatter proof heater
• Shock resistant
• Position vertical, horizontal and completely submerged
• Graduated scale for precise maintenance of set temperature
• No damage in case of running dry

List Price: $ 22.49
Price: $ 15.49

THEO UL Heater 150W

Theo Heater. New aquarium heater functioning with the exclusive PTC technology means that this heater will not break or damage when run out of the tank. Theo aquarium heater has all the necessary feature for safe and precise temperature maintenance of the water in your tank. The exclusive technology and the high quality of components guarantee a long lasting product.

• High resistance - the first shatter proof heater
• Shock resistant
• Position vertical, horizontal and completely submerged
• Graduated scale for precise maintenance of set temperature
• No damage in case of running dry

Rating: (out of 2 reviews)

List Price: $ 24.99
Price: $ 17.19

THEO UL Heater 150W Reviews

Review by T Cunningham:

Turned it on, it warmed the water, perfect but with all things, not every single item made can be perfect and there are bad apples in every batch, If you need a heater of this size, this one is very nice. Mine has had no issues defects or problems.

Buy THEO UL Heater 150W now for only $ 17.19!

MINI HEATER Aquarium Heater 15W for Tanks 5-10 Gallons

Mini Aquarium Heater helps increase by a few degrees the water temperature of mini aquariums compared to the room temperature where they are positioned. Raises temperature approximately 5 degrees Fahrenheit in a 5 gallon tank and 4 degrees Fahrenheit in a 10 gallon tank

• Suitable for marine and tropical aquariums
• Extra small - easy to hide in mini tanks and bowls
• Super Safe - no damage if left running dry
• Submersible
• for 5 to 10 gallon tanks

Rating: (out of 2 reviews)

List Price: $ 13.99
Price: $ 11.66

MINI HEATER Aquarium Heater 15W for Tanks 5-10 Gallons Reviews

Review by J. Price:

It is easy to use and rated up to a 5 gallon…I thought mine being a 6 gallon wouldn’t be a problem but this sissy thing bearly heats up at all.

Buy MINI HEATER Aquarium Heater 15W for Tanks 5-10 Gallons now for only $ 11.66!

Jebo Aquarium Fish Tank Automatic Heaters 100w 40gal

This aquarium heaters is submersible. Aquarium heater is a must have for tropical fishes and corals. Temperature fluctuations cause stress in your corals and fish, and the fluctuations often go unnoticed by the aquarist. A good quality heater is a requirement in keeping Happy Fish, Healthy Aquarium!

A minimum of 3-5 Watts per gallon is recommended for keeping your aquarium at optimal temperatures. Aquarists with larger tanks should use more than one heater. The use of multiple heaters offers the advantage of maintaining heating capacity in the unlikely event that your heater has a problem.

• 100 Watt, for up to 40 Gallon tank
• Compact design! Length: 9.8 inches
• Anti-overwind adjustable knob!
• Waterproof insulation design!
• High impact safety glass

Price: $ 12.99

Jebo Aquarium Fish Tank Automatic Heaters 25w 10gal

This aquarium heaters is submersible. Aquarium heater is a must have for tropical fishes and corals. Temperature fluctuations cause stress in your corals and fish, and the fluctuations often go unnoticed by the aquarist. A good quality heater is a requirement in keeping Happy Fish, Healthy Aquarium!

A minimum of 3-5 Watts per gallon is recommended for keeping your aquarium at optimal temperatures. Aquarists with larger tanks should use more than one heater. The use of multiple heaters offers the advantage of maintaining heating capacity in the unlikely event that your heater has a problem.

• 25 Watt, for up to 10 Gallon tank
• Compact design! Length: 8.5 inches
• Anti-overwind adjustable knob!
• Waterproof insulation design!
• High impact safety glass!

Price: $ 12.99

Tetra Submersible 50-Watt Heater

This Tetra submersible 50-watt heater is very easy to use for aquariums ranging from 2 to 30-gallons. The electronic thermostat automatically adjusts heat output to keep the water at a constant 78 degrees Fahrenheit. All you have to do is put it in the aquarium and plug it in.

• No adjustment required
• Easy to conceal
• Two year warranty
• Please read all label information on delivery

Rating: (out of 8 reviews)

List Price: $ 19.99
Price: $ 10.01

Tetra Submersible 50-Watt Heater Reviews

Review by HP:

I was researching on a good heater for a 1.5gal fish tank, and I came across the Tetra submersible HT 10. It fits very well into the tank, and the heater maintains a constant temperature at 76F. I am satisfied with this heater. However, you cannot change the temperature setting. It has been 3 months since i bought this heater, and i have no complaints yet. My fish is healthy and well heated with this HT10 from tetra.

Review by Margaret A. Cooper:

I was pleased with this submersible heater for two weeks, when it stopped heating. The green indicator light is showing, but the 1.5 gallon tank temperature has dropped to 71-72 degrees. The red (heating) indicator light has not come on in the past 48 hours. My presumption is the built-in thermostat no longer functions, so the heater part will never come on, if in fact it even still works. The two year warranty is rather pathetic, as I would have to pay shipping + send them a check to defray their costs. As an additional irk, a new Tetra filter pump lasted 3 weeks then stopped pumping out air. I will not purchase any more Tetra products.

Buy Tetra Submersible 50-Watt Heater now for only $ 10.01!