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What does Cobalt document for the Neo-Therm Pro 200 W tank-size ceiling?
Cobalt lists this 200 W model up to 55 US gallons. That maximum is not a performance promise; room temperature, tank cover, circulation and target all matter. The reviewed sources do not establish the exact US voltage/frequency nameplate, so this model stays reference-only rather than a finder or purchase recommendation.
Explore this need in the finder →Is the Neo-Therm Pro 200 W listed for saltwater?
Yes. Cobalt identifies the Neo-Therm Pro family for freshwater and saltwater, and lists this 200 W size up to 55 US gallons. It calls the outer casing shatterproof and the heater fully submersible. Confirm the actual unit's voltage/frequency and current instructions before use; those details remain unverified here.
Explore this need in the finder →What should I check when setting up the Neo-Therm Pro 200 W?
Cobalt says to mount the fully submerged heater with its supplied bracket and suction cups, keep it clear of gravel and decorations, leave it submerged at least 15 minutes before powering it and create a drip loop. The LED arrangement displays set and tank temperatures, while the button advances in 2°F increments; not every whole-degree value between 68°F and 94°F is selectable. Verify water with an independent thermometer and check the unit's electrical label.
Explore this need in the finder →The largest confirmed current selector size
The reviewed Cobalt Neo-Therm Pro selector ends at 200 W. That size is listed for aquariums up to 55 US gallons and has overall dimensions of 2.25 × 1.25 × 11 inches. The manufacturer does not label the axes, so 11 inches is treated as the longest listed measure. It is the same longest measure as the 150 W size, which has a 40-gallon maximum; the 200 W moves the stated ceiling to 55 gallons without a longer published body. Check the physical compartment and bracket clearance even if the nominal length appears suitable.
The 55-gallon figure is a maker maximum, not a guarantee of heating performance in a particular room. Cold ambient air, a large target-to-room difference, drafts, an uncovered top and water circulation can change the load. The manufacturer does not give a lower aquarium size for the 200 W or a tested temperature-rise profile. This review does not invent a minimum or say that a 55-gallon aquarium automatically needs this model. Real water volume and the keeper’s independently determined animal temperature matter more than a bare volume label.
What the control can and cannot select
Cobalt describes an adjustable 68–94°F span, a simultaneous LED display of the setpoint and tank reading, and claimed ±0.5°F accuracy. These specifications come from the product materials. They are not results of an independent calibration test, and they do not mean the water everywhere in a 55-gallon aquarium will equal the heater display. Use an independent aquarium thermometer to check conditions after installation and during maintenance.
The button advances the setting by 2°F, according to the manufacturer. The 68–94°F endpoints therefore do not establish that each degree between them is selectable. An odd-degree request may lie within the published span yet fall between available steps. The finder’s current numeric rule compares only endpoints; it has no increment check. The 200 W record stays reference-only rather than suggesting that every in-range whole degree is selectable. That keeps the page honest about what the current questionnaire can and cannot test.
Placement, casing and safety limitations
Cobalt says the Pro is fully submersible, supplies a mounting bracket with suction cups, and describes the outer casing as shatterproof. Its installation text says to keep the heater clear of gravel or decorations, wait at least 15 minutes while the heater is submerged before power-on, and arrange a drip loop. It recommends regular exterior cleaning to remove mineral and algae deposits. Its FAQ permits vertical, horizontal or slanted mounting but advises against sump areas where the water level fluctuates. A separate thermometer remains useful, and the product text is not a substitute for the exact instructions in the box.
The maker advertises automatic shutoff circuitry to prevent overheating, but the currently reviewed Pro materials do not identify its trip conditions or say the heater may run dry. “Shatterproof” is a casing description, not proof of immunity to damage, and no separate guard is confirmed. Avoid contact with hardscape, follow the heater’s water-level directions, and disconnect it as the current instructions require for maintenance. Do not infer a complete safety procedure from a product image.
Do not treat the recommendation block as a 300 W model
The manufacturer page’s actual choice list and its “available in 25–200 watt sizes” statement include the 200 W as the final selectable Pro size. Elsewhere the same page’s tank-size recommendation block mentions 250 W and 300 W. Those statements conflict. The 250 W and 300 W entries are not in the current selector, and the current Pro-specific identities, dimensions, electrical ratings and package photographs were not resolved in this research cycle. They are recorded as an open manufacturer-page discrepancy rather than represented as confirmed models or silently deleted from the source notes.
The exact 200 W official image shows a package marked 200 Watt beside the heater. It is not evidence of a 250 W or 300 W sibling, and it does not indicate size at scale, present availability or performance. If evaluating a product advertised as 250 W or 300 W, confirm that its actual carton and manual say Neo-Therm Pro and do not assume that old Neo-Therm details or a multi-heater combination applies to one unit.
Remaining electrical and manual checks
The 200 W model is identifiable in the U.S.-oriented Cobalt product route and the opened retailer selector, but exact voltage, frequency and amperage are not shown in the reviewed records. A shipping destination does not prove an electrical version. The current Pro-specific instruction file and revision also remain unknown. A 2012 manual for the predecessor Neo-Therm has a different 66–96°F control range and warranty text; that evidence is intentionally not copied into this 200 W assessment.
On paper, this size brings the highest capacity maximum among the six confirmed 25–200 W options and shares the 11-inch longest listed dimension with the 150 W. It could be worth comparing for a setup where those stated features matter. It is not a finder match or purchase recommendation until the exact electrical label is checked and the finder can represent 2°F selection increments. Before use, verify the package and input rating, measure the mounting space, set a species-appropriate target, and compare actual water with a separate thermometer. This is source research, not ownership, lab testing or a guarantee.
Key specifications
Key details at a glance
| Rated heater power | 200 W |
|---|---|
| Manufacturer aquarium rating | 55 US gal |
| Lowest thermostat setting | 68°F |
| Highest thermostat setting | 94°F |
| Temperature control | Adjustable thermostat |
| Supported water types | freshwater / saltwater |
| Installation route | Fully submerged, in-tank |
| Heater length | 11 in |
Use the exact model’s instructions for operating limits, supplied equipment and version differences.
Sources for this review
Sources for this assessment
Check the complete aquarium setup
Use the finder to compare documented tank size, water type, installation and temperature-control fit. A match does not guarantee the keeper's species-specific target or measured performance.