EHEIM thermocontrol 100 vs Fluval E100

What changes for you, from the makers' published figures. Neither is "better": the right one is the one that fits your tank and how you look after it.

For a 20 gallon long (example)

Only the Fluval E100 fits by its maker’s rating.

  • EHEIM thermocontrol 100: Rated 26.4–39.6 gal, not 20 gal.
  • Fluval E100: Rated for a 20 gal tank.

What changes for you

  • Tank size: the EHEIM thermocontrol 100 is rated 26.4–39.6 US gal, the Fluval E100 up to 30 US gal.
  • Size: EHEIM thermocontrol 100 12.6 in long, Fluval E100 11.75 in long. Check it fits your tank’s water depth at the angle you mount it.
  • Type: EHEIM thermocontrol 100 is an adjustable submersible model, Fluval E100 an adjustable, electronic model, so installation and cleaning differ.

Next: EHEIM thermocontrol 100: details and fit · Fluval E100: details and fit · All heaters for your tank

EHEIM thermocontrol 100

Fluval E100

Both drawn at one scale on a 20 gallon long (example), from the makers’ published dimensions; positions are approximate.

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EHEIM thermocontrol 100

Manufacturer-rated for aquariums of 26.4–39.6 US gal; adjustable 65–93°F.

Drawing of an aquarium heater (not a photo of the EHEIM thermocontrol 100)

Fluval E100

Manufacturer-rated for aquariums up to 30 US gal; adjustable 68–93°F.

Drawing of an aquarium heater (not a photo of the Fluval E100)

Side by side

EHEIM thermocontrol 100 vs Fluval E100: published specifications
Published figureEHEIM thermocontrol 100Fluval E100
Rated tank size26.4–39.6 US galUp to 30 US gal
Power100 W100 W
Dimensions12.6 × 1.4 × 1.4 in (L × W × H)2 × 1.25 × 11.75 in (L × W × H)
In the boxheater, double suction-cup holder, 2 suction cupsheater, fish guard, mounting bracket

Figures as published by each maker; see each model’s page for its sources. Open this pair in the full comparison tool →

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