Adjustable Submersible Aquarium Heater | 25W–300W Thermostat Heating Rod for Fish Tanks | NAUTILUS AND CO.

Precise Temperature Control for Every Tank Size

Maintain the perfect water temperature for your fish, corals, and aquatic plants with this adjustable submersible thermostat heater. Available in 5 power levels from 25W to 300W, it's engineered for reliable performance in freshwater and saltwater tanks of all sizes.

Features

• Fully adjustable thermostat — dial in your exact target temperature
• 5 power options (25W, 50W, 100W, 200W, 300W) — matched to your tank volume
• 110-120V US plug — no adapter needed
• Fully submersible quartz glass tube — shatter-resistant and safe
• LED indicator light — shows when heater is actively heating
• Auto shut-off protection — prevents overheating
• Compatible with freshwater and saltwater aquariums

Which Wattage Do I Need?

• 25W — nano and small tanks up to 8 gallons
• 50W — small tanks, 8–20 gallons
• 100W — medium tanks, 20–40 gallons
• 200W — large tanks, 40–75 gallons
• 300W — extra-large tanks and aquascapes, 75–120 gallons

Specifications

Voltage: 110-120V (US) | Power: 25W / 50W / 100W / 200W / 300W | Fully submersible | Compatible with freshwater and saltwater aquariums | Material: Quartz glass