Can those heaters be good as well?

Sprinkle

Sprinkle

AC Members
Mar 21, 2020
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Hi all! ❤️

I have found these heaters while looking up at condesation in one.
Cheap 25 watt for my betta tank:

www.ebay.co.uk

NEWA Quality Visi-Therm 25w Aquarium Fish Tank Heater Thermostat Heaterstat | eBay

NEWA Visi-Therm 25W Aquarium Heaterstat. Protective Visi-Therm guard. Waterproof double insulation. Light indicates on off cycle. Made in Italy. For aquariums from 12 to 25 litres.
www.ebay.co.uk

And not so cheap one:

www.ebay.co.uk

Newatt Heater-Stat 25w Aquarium / Fish Tank Heater With Thermostat AQ24030 | eBay

Find many great new & used options and get the best deals for Newatt Heater-Stat 25w Aquarium / Fish Tank Heater With Thermostat AQ24030 at the best online prices at eBay! Free delivery for many products!
www.ebay.co.uk

Can 25 watts be as well for my 25-28 L tank? I don’t want to bake and nuke my fighter.
 
I don't use heaters anymore, so I have no recommendations....
The problem with those heaters is they work with bimetallic strips which are very unreliable. I think some of them Eheim pro thermo filters have heaters with sensors, they can go a long way.... but of course any electrical component can fail. To prevent overheating you would typically underpower it and get a low wattage heater so it just heats the tank to the required temperature (like for example a max 50 watt heater on a 100 liter tank) and when it fails it would go a couple of degrees higher but it would be impossible or take at the very least several days to reach a dangerous temperature. But since your tank is very small, you would need a 10 watt heater or something, maybe they exist for nano tanks?
 
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