Aquarium Heaters – Adjustable Fish Tank Heaters for Freshwater Aquariums

Aquarium heaters are essential for maintaining a stable, healthy water temperature in tropical fish tanks. At Tropical Treasures Wyo, we offer reliable, adjustable submersible heaters sized for nano tanks up to large aquariums, keeping your fish, shrimp, and plants comfortable year-round.

Choose the right wattage for your tank size and pair your heater with dependable filtration, quiet air pumps, and aquarium tools for a complete setup — ideal for planted aquariums. Fast shipping from Wyoming nationwide.

Aquarium Heater Wattage Guide

Not sure what size heater you need? Use this quick reference to match your tank volume to the right wattage. As a general rule, aim for roughly 3–5 watts per gallon, and size up if your room runs cold or you keep warm-water species like discus.

Shop heaters by brand: Fluval, Hygger, Aquatop, and Eheim.

For tanks larger than about 75 gallons, many aquarists run two smaller heaters instead of one large unit — it spreads heat more evenly and gives you a safety margin if one ever fails.

Frequently Asked Questions

What size heater do I need?
A good rule of thumb is 3–5 watts per gallon, so a 20-gallon tank does well with a 75–100 watt heater. Size up if your home runs cold or you keep warm-water species like discus, and consider two smaller heaters on tanks over about 75 gallons for more even heat and a safety margin.

Do I need a heater for my aquarium?
Most tropical fish, shrimp, and plants need stable temperatures in the mid-70s to low-80s °F, so a heater is recommended for nearly all indoor tropical setups. Coldwater species like goldfish are the main exception.

Where should I place my aquarium heater?
Position it near good water flow, such as beside a filter outflow, so heat distributes evenly. Keep it fully submerged per the manufacturer’s instructions.