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Cobalt AquaticsNeo-Therm Pro Aquarium Heater (100 watt), Fully-Submersible Freshwater, Saltwater, Thermostat, Thermometer, Shatterproof

Q: Would this work for a four gallon or is it to big?

I'm using it in a 3 gallon Tetra Cube. As long as it's submerged horizontal or vertically, and not touching substrate, it'll work. The heater is 6.5" tall x 2" wide. I like it because, it heats to a set temperature; if the tank is too warm, it shuts off. I've been using it for a month, checking with a thermometer, and it's been spot on 80, as set for my Betta.

Q: How many gallons will this heat?

It works really good on our 50 gallon tank, room temperature range from 60 to 75 degree.

Q: Does it retain setting if there is a power failure ?

Yes it does, retain setting if there is a power failure. A very good heater, with a very wide temperature spread (66° to 96°) to set the heat too. Compact & very reliable! You will not be disappointed.

Q: About how long should it take to heat a 70 degree 5 gallon tank to 78 degrees?

It took mine under 15 minutes to heat my 2.6 gallon tank from 74 to 78 degrees. If I may, I would suggest that you check out a 50 watt heater, the 25 w is meant for 2 to 4 gallon tanks.

4.3/5

Product ID: 558337571

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Would this work for a four gallon or is it to big?

How many gallons will this heat?

Does it retain setting if there is a power failure ?

About how long should it take to heat a 70 degree 5 gallon tank to 78 degrees?

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