Best Aquarium Heater 20 Gallon

NICREW Aquarium Heater 100W, Temperature Adjustable Fish Tank Heater with Controller for 10-20 Gallon, Overheat Protection

HiTauing Aquarium Heater, 50W/100W/200W/300W/500W Submersible Fish Tank Heater with Over-Temperature Protection and Automatic Power-Off When Leaving Water for Saltwater and Freshwater

HiTauing Aquarium Heater, 100W Fish Tank Heater with LED Digital Display & 5 Safety Protection, Submersible Aquarium Heater with 2 Suction Cup and 5.9Ft Cord for 10-20 Gallon Fish Tank.

hygger Newly Quartz Fully Submersible Aquarium Heater, 100W/2002/300W/500W/800W Fish Tank Heater with LED Display Controller for 10-190 Gallons Marine and Freshwater (100W for 10~25 Gallon)

Abhirsh Aquarium Heater 50 Watt - Reliable Fish Tank and Immersion Water Heater, Adjustable Temperature Submersible Thermostat Heater for 5-10 Gallon

Fluval T100 Fully Electronic Aquarium Heater, 100W, up to 30 US Gal / 100 L

Aquael Ultra Aquarium Heater - for Freshwater and Saltwater Aquariums (75 Watt / 9-20 Gallons)

Eheim Jager TruTemp Submersible Heater - 50 W

SainSmart XpertMatic Submersible Aquarium Heater, 100W Adjustable Fish Tank Heater Thermostat with Suction Cup, for Marine Saltwater and Freshwater, Up to 20 Gallon Fish Tanks

Aqueon Adjustable PRO Aquarium Heater