Marina C10 Compact Heater

I have used this heater in 2 tanks now, 1 1.6 gallon and now its in a 2 gallon rimless shrimp tank. Keeps the water 72-78 without fail. No you can't adjust the temperature, but for 98% of freshwater fish it is the correct temp anyway. The light only comes on when its heating. No light, no Heating. It does NOT mean that its broken if the light doesn't come on. Check your tank temperature before complaining about it. I can almost guarantee you that your tank is in that sweet spot it should be.

I would definitely buy another without hesitation.

I bought the Marina C25 compact heater about 2 weeks ago. I was worried about purchasing this because of the bad reviews, but I decided to go for it because it was on sale at my local fish store. This heater looks EXACTLY like the Fluval Compact Heater 25watt. The heater is thin, and not at all bulky like it is made to appear in the photo. This heats my Fluval Edge 6 Gallon perfectly! The temperature is a constant 76-78 degrees. I had to remove my thermometer just to make sure it was working (it was) because I never saw fluctuations in temperature.

The directions do say that you should submerge the heater into the tank and leave in there (unplugged) for about 10 min. I left it in for an hour before plugging it in. I was worried about fully submersing the entire thing into the water (even the part where the cord comes into the heater), but IT IS OK to do that. I had to research it on a different site to make sure I wasn't going to get electrocuted. The heater needs to be underwater at all times. This heater is awesome, and I definitely recommend this product.

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I finally moved our betta fish to a Fluval Spec Aquarium, which has a super filtration system for a 2-gallon pico and nice LED lights. Quite an upgrade from a Mason jar! I then bought this compact heater which fits very nicely in the same compartment as the pump in the Spec. It warmed up the water to a perfect 78 deg. F. and my betta is swimming more actively and looks much happier. He was probably too cold in the jar. I have no complaints about this heater--it's very compact and does the job it's supposed to. Since this is only 10 watts I wouldn't use for anything larger than the Spec tank. On our Fluval Chi tank we have a Fluval 25 watt heater, which is working very well.

Read Best Reviews of Marina C10 Compact Heater Here

This heater stablized the 2 gallon tank quickly and maintains at 77-78. Does not overheat even a very small tank.

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I have had this heater about 8 months now in my Bettas 5 gallon hex and it has never given me an issue my Betta is very healthy and happy and this keeps my tank a constant temp ... the only thing I don't like is it isn't adjustable

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