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.

How many gallons will this heat?

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

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.

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.

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🌊 Dive into Precision with the Neo-Therm Pro!

SAFETY FIRST - Automatic shutoff for peace of mind!
USER FRIENDLY DISPLAY - Monitor your tank's health at a glance!
ENERGY EFFICIENT DESIGN - Save on energy while keeping your aquatic friends cozy!
SHATTERPROOF RELIABILITY - Built to withstand the test of time and water!
PRECISION MEETS PERFORMANCE - Experience temperature control like never before!

The Cobalt Aquatics Neo-Therm Pro Aquarium Heater 100W features an advanced electronic thermostat with ±0.5°F accuracy, ensuring precise temperature regulation for both freshwater and saltwater tanks. Its fully submersible design and shatterproof casing guarantee durability, while the automatic shutoff feature enhances safety. The easy-to-read LED display allows for effortless monitoring, and its energy-efficient design makes it perfect for larger tanks.

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Cobalt Aquatics Neo-Therm Pro Aquarium Heater 100W - Accurate ±0.5°F Electronic Thermostat - Shatterproof for Freshwater & Saltwater Tanks

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