150w300w500w-In-Line-External-Heater-AQUARIUM-HEATER-150300500-WATT-12-58 Published May 7, 2017. Size: 298 × 500 in 150w/300w/500w in-Line External Heater Aquarium Heater – 150/300/500 WATT 1/2″-5/8″ < Previous Next >