Charles Austen CB8300 100W Aquarium Heater

Charles Austen CB8300 100W Aquarium Heater

Charles Austen CB8300 100W Aquarium Heater is a fully submersible thermostatic aquarium heater intended for 90-150 litres under normal indoor conditions. This page identifies the exact model, duty figures and selection limits so it can be compared accurately with the other products in the range.

Charles Austen is both the product brand and supplier. The figures below come from the current 2026 supplier catalogue, supported by manufacturer guidance where a current technical page is available. Maximum figures are not the same as guaranteed installed performance: pipework, depth, pressure, media loading and maintenance all affect the result.

Who is the CB8300-100W best suited to?

This model is best considered for 90-150 litres under normal indoor conditions. It sits 2 of 5 when the range is ordered by nominal output/capacity. That makes it easier to judge whether it is a compact entry model, a mid-range choice or one of the higher-output options before comparing price alone.

Key product features

• Adjustable 18-32°C temperature range
• Thermostatic operation with heating indicator
• Suction-cup mounting
• Published aquarium guidance: 90-150 litres
• Exact SKU and manufacturer part number: CB8300-100W.
• Supplied through Charles Austen and linked to compatible models for easier range comparison.

Technical specification

Technical figures are nominal supplier ratings. The calculated 24-hour energy figure, where shown, is rated wattage × 24 hours and does not include tariffs or intermittent thermostat operation.

Understanding the published specification

Heater wattage and aquarium-volume guidance must be considered with the required temperature rise. The 100 W is published for approximately 90-150 litres under normal indoor conditions, but a cold room, open top or strong evaporation increases heat loss. The thermostat controls temperature; it does not increase the heater’s maximum output.

The catalogue specification for this exact model is 100W. Where the page includes a calculated daily-energy figure, it is provided only to make continuous-running products easier to compare; it is not an electricity-cost estimate and does not replace the rated power shown above.

How to size this model correctly

Aquarium volume is only a starting point. Room temperature, target temperature, lid coverage and water movement affect heat loss; use more than one heater where redundancy is important.

For critical livestock, treatment or commercial systems, allow spare capacity and consider redundancy. If the required duty is close to the model’s maximum, moving to the next size normally provides a more useful operating margin than running a smaller unit continuously at its limit.

Installation and commissioning

Installation format: Fully submerged in an area of reliable aquarium circulation. Keep access available for cleaning and servicing, use appropriately sized hoses or airline, and avoid unnecessary bends or restrictions. Aquatic electrical equipment should be protected by a suitable RCD and installed in accordance with the supplied instructions.

Allow the heater to equalise to aquarium temperature before switching it on, set a conservative target and verify the result with a separate thermometer. Temperature changes should be gradual. Isolate the heater before water changes and allow it to cool before exposure to air.

Commission the complete system by checking actual flow, pressure, water level or temperature at the point of use rather than assuming the headline maximum will be achieved. Recheck after filters, diffusers or pipework have had time to accumulate normal fouling.

Compatible system components

Place the heater where filtered water circulates around it so warmed water is distributed evenly. Keep it fully submerged within the indicated level and away from contact with décor or substrate. For valuable livestock, two smaller heaters can provide more even heat and partial redundancy than one unit carrying the whole load.

Compatibility should be confirmed from the complete installation: connection size, hose or airline bore, voltage, control method, permitted flow and future servicing access can all affect whether two individually suitable products work correctly together.

Maintenance and service life

Allow the heater to equalise in the water before switching on and isolate it before water changes. Never operate it dry or expose hot glass to sudden temperature change.

Record the installation date and normal operating performance. A visible reduction in output, increasing noise, rising temperature or repeated tripping should be investigated rather than compensated for by restricting or altering other parts of the system.

Performance checks and fault finding

If the aquarium remains cool, check room temperature, actual water volume, circulation and whether the indicator cycles. If temperature overshoots or the heater remains on continuously, disconnect it and verify with a separate thermometer. Never operate a damaged or cracked heater.

Compare any suspected fault with the clean, newly commissioned condition. Changes across every outlet or return normally point to the main unit or a shared restriction; a problem affecting one branch is more likely to be local pipework, airline, a valve, diffuser or connected accessory.

Compare similar aquarium heaters

The table below links to five nearby models so the buyer and search crawler can move through the range without returning to a search page.

Model	Key published duty	Product type
CB8300-50W	50 W	Aquarium Heater
CB8300-150W	150 W	Aquarium Heater
CB8300-200W	200 W	Aquarium Heater
CB8300-300W	300 W	Aquarium Heater
HS52A	600-2200 L/hour · 1/6 hp	Water Chiller

Complete the system and explore the range

The supplier and customer-facing brand for this listing is Charles Austen. The links below connect this model to its dedicated range, relevant system components and the wider Charles Austen catalogue.

• Browse the Charles Austen CB Heater Series
• Browse all Charles Austen products
• Aquarium accessories
• Heating and temperature-control equipment

Technical information sources

Core model figures were checked against the current 2026 Charles Austen supplier catalogue. Family features, installation points and application guidance were cross-checked against current manufacturer technical material where available.