# Fluval E300 vs Cobalt Aquatics Neo-Therm 100W: specs and price compared

A sourced, side-by-side comparison of the Fluval E300 (Fluval) and Cobalt Aquatics Neo-Therm 100W (Cobalt Aquatics) among aquarium heaters. Cobalt Aquatics Neo-Therm 100W is the cheaper of the two at $49.12.

## Side by side

| Spec | Fluval E300 | Cobalt Aquatics Neo-Therm 100W |
| --- | --- | --- |
| US price | $72.99 | $49.12 |
| Brand | Fluval | Cobalt Aquatics |
| Wattage (W) | 300 | 100 |
| Tank size range gal | up to 100 gal | up to 29 gal |
| Adjustable thermostat | Yes | Yes |
| Material | glass | plastic |
| Fully submersible | Yes | Yes |
| Temperature accuracy f | — | ±0.5°F |
| Shatterproof guard | Yes | Yes |
| External controller | No | No |

## Key differences

- Wattage (W): Fluval E300 300 vs Cobalt Aquatics Neo-Therm 100W 100
- Tank size range gal: Fluval E300 up to 100 gal vs Cobalt Aquatics Neo-Therm 100W up to 29 gal
- Material: Fluval E300 glass vs Cobalt Aquatics Neo-Therm 100W plastic

## Sources

- Fluval E300: https://aquacave.com/hagen-fluval-e-300-watt-electronic-aquarium-heater.html (aquacave.com, verified 2026-08-16)
- Cobalt Aquatics Neo-Therm 100W: https://www.bulkreefsupply.com/100w-neo-therm-submersible-heater-open-box-cobalt-aquatics.html (bulkreefsupply.com, verified 2026-08-16)

Canonical: https://frontdeskreview.com/gear/aquarium-heaters/fluval-e300-vs-cobalt-neo-therm-100w/
Cite: Per The Front Desk Review, Fluval E300 ($72.99) vs Cobalt Aquatics Neo-Therm 100W ($49.12) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/aquarium-heaters/fluval-e300-vs-cobalt-neo-therm-100w/
License: CC BY 4.0.