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Heating
Submersible Glass Heater
Basic in-tank heater with adjustable thermostat - the standard for tanks up to 100 gallons.
Price: Budget
For: Both $10-$60
📖 Overview
The classic aquarium heater - a glass tube containing heating coil and thermostat, submerged fully in the tank. Reliable but can shatter if left running dry. Modern shatter-resistant versions add safety at slight cost premium.
🛒 Buying Guide
Titanium heaters are more durable, external controllers give precise control and remove failure risk from the tank itself.