Sign in to unlock exclusive benefits
30-Day Free Returns*
Maintain the perfect aquarium temperature with the Cobalt Aquatics heater, a top choice in heater for aquarium options. Made by Cobalt Aquatics, this high-quality glass heater ensures reliable and precise heating for your fish tank. Built from durable, shatterproof glass, it offers lasting performance and safety. With 200 watts of power, it’s ideal for medium to large aquariums.
Cobalt Aquatics
200W
Up to 55 gallons
Fully submersible glass heater
±2°F

Just make sure you check the tank-size recommendation before buying. The 200W model is rated for up to 55 gallons, so it wasn't the right choice for anything larger.
I really like having the LED indicator. It's a quick way to tell when the heater is actively running
I keep both tetras and bettas, and this heater has worked well for my setup. No complaints so far.
I had the 75W version before, but after moving to a bigger tank, I upgraded to the 200W. It was an easy switch
Use code: WELCOME10
To Get Instant 10% Discount on Your First Order!
Screen reader optimized
Clear flashes & reduces color
More focus & fewer distractions
Assist with reading & focusing
Enhances website's visuals
Enter your email to claim your exclusive welcome discount.
For first-time customers only. We will send a verification code to your email.
We sent a 6-digit code to
Your code is ready to use. Apply it at checkout.
—
This referral discount is only available for first-time customers. Thanks for being a loyal shopper!