I've got a 300w heater in my 75 gallon tank and it's set to around 86 degrees and has it heated up to within 85.5 Fahrenheit. Fair warning, with mine, at the first use, it took almost a full day to get even close to the set temperature.

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EHEIM Jager Aquarium Thermostat Heater 150W

EHEIM Jager Aquarium Thermostat Heater 150W

Q: Heater is too long to sit vertical in my tank. Horizontal would be fine. It says it's fully submersible but I'm reading the opposite here. Any help?

The whole heater should be submersed in water because the thermostat is at the top. If the top sits out of the water you're not using the temperature of the water with the thermostat, then and it will be inaccurate. It will still work, but if you get a draft of cold that wafts in from somewhere into the top of your tank, it will stop heating the tank and that cold air will lower the temperature. It's also a good idea to place it slightly slanted so heat rising from the bottom where the heating element is located does not go straight to the top and give an inaccurate reading on the thermostat above it. Placing it this way is absolutely necessary for larger tanks with a high wattage heater because it produces a lot of heat, but not so necessary for smaller tanks. If you want to place something as small as a 25–50 watt heater straight up and down, then go right ahead so long as all of its submerged in the water.

Q: How would this handle a ~200 gal tank outdoors where it can get into the 20's (F) occasionally?

I don't believe it will. i had it in a 175 gallon tank in my greenhouse (unheated) and it got down below 50 degrees in the tank when outside temps were 20 degrees. it has a good thermostat and you could use 2 of them to be on the safe side

Q: Is this an adjustable heater?

If you mean is the temperature adjustable, then yes it is.

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Product ID: 2334355

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⚡150W power

💧Fully submersible

🌡️Precise temperature control

Frequently Bought Together

EHEIM Jager Aquarium Thermostat Heater 150W

PAIZOO Fish Tank Digital Thermometer Accurate LED Display to ±0.9°F Tank Thermometer Aquarium Temperature Measurement Suitable for Fish, Axolotl, Turtle or Aquatic

API FRESHWATER MASTER TEST KIT 800-Test Freshwater Aquarium Water Master Test Kit, White, Single, Multi-colored

Description

🌊 Dive into Precision Heating!

BUILT TO LAST - Shock-resistant and shatter-proof glass construction.
SMART SHUTDOWN - Automatically turns off when water levels are low.
MONITOR WITH EASE - On/Off indicator light for quick status checks.
STAY SAFE STAY WARM - Thermo safety control prevents dry running.
PRECISION AT YOUR FINGERTIPS - TruTemp dial for accurate temperature regulation.

The EheimJager Aquarium Thermostat Heater 150W is a fully submersible heater designed for both fresh and marine water. It features advanced safety controls to prevent dry running, a TruTemp dial for precise temperature regulation, and a durable construction that is shock-resistant and shatter-proof. With an easy-to-read On/Off indicator light, this heater ensures your aquatic environment remains stable and safe.

Have a Question? See What Others Asked

Heater is too long to sit vertical in my tank. Horizontal would be fine. It says it's fully submersible but I'm reading the opposite here. Any help?

gallons heated?

How would this handle a ~200 gal tank outdoors where it can get into the 20's (F) occasionally?

Is this an adjustable heater?

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