Eheim Jager TruTemp 100W Aquarium Heater fit check
Eheim Jager TruTemp 100W Aquarium Heater is a 100W glass heater adjustable from 65 to 93F. ReefCrafter's 2.5-5 watts-per-gallon band puts it at roughly 20-40 gallons of display water, before room temperature and redundancy choices. Pair it with a controller if a stuck-on failure would be hard to catch quickly.
Eheim Jager TruTemp 100W Aquarium Heater: fits roughly 20-40 gallon systems. Specs, compatibility math, sizing risks, and alternatives before you buy.
Who it is for
Good fit for
- ✓ 20-40 gallon systems, per the catalog fit range.
- ✓ Roughly 20-40 gallons of display water at 2.5-5 W per gallon.
Not a fit for
- ✕ Tanks under about 20 gallons; it is sized above them.
- ✕ Systems over about 40 gallons without adding capacity elsewhere.
Listed features
- submersible glass
- TruTemp calibration
- range 65-93F
Compatibility math
Safe wattage band
Example: 100W is usually a planning fit for roughly 20-40 gallons before room-temperature and redundancy choices.
ReefCrafter checks both the low-wattage failure and the oversized stuck-on failure.
Risk notes
- A single oversized heater can cook livestock faster than a beginner notices the problem.
Professional fit context
- Check wattage, controller, redundancy, tank size, and whether two smaller heaters are safer.
- Eheim Jager TruTemp 100W Aquarium Heater fits roughly 20-40 gallon systems; confirm that range against the final display volume, sump volume, and livestock plan.
Alternatives to compare
- Cobalt Neo-Therm 100W Submersible Heater
Same 100 W; compare format and features instead.
- Bulk Reef Supply BRS 100W Titanium Aquarium Heater System WiFi
Same 100 W; compare format and features instead.
- Bulk Reef Supply BRS Titanium Heater Element 100W (no controller)
Same 100 W; compare format and features instead.
Full spec snapshot
- Category
- Heaters
- Build tier
- Budget
- Estimated price
- $33
- Tank fit range
- fits roughly 20-40 gallon systems
- Format
- Glass Heater
- Heater wattage
- 100 W
Related reading
Questions
What size tank is a 100W heater like the Eheim Jager TruTemp 100W Aquarium Heater for?
ReefCrafter's 2.5-5 W per gallon band puts 100W at about 20-40 gallons. Cold rooms push toward the smaller end; tanks over 50 gallons are safer with two smaller heaters.
What tank size is the Eheim Jager TruTemp 100W Aquarium Heater for?
ReefCrafter's catalog fit range for it is 20-40 gallon systems. Confirm that against your final display volume, sump volume, and livestock plan rather than the box label alone.
What should I compare the Eheim Jager TruTemp 100W Aquarium Heater against?
Cobalt Neo-Therm 100W Submersible Heater (Same 100 W; compare format and features instead); Bulk Reef Supply BRS 100W Titanium Aquarium Heater System WiFi (Same 100 W; compare format and features instead); Bulk Reef Supply BRS Titanium Heater Element 100W (no controller) (Same 100 W; compare format and features instead).
What range and accuracy does the Eheim Jager TruTemp 100W Aquarium Heater list?
The retailer listing gives: range 65-93F.
