Description:
Pet Worx Aquarium Heaters are a reliable and easy-to-use heating solution designed to help maintain stable water temperatures in both freshwater and marine aquariums. A consistent temperature is essential for fish health, helping reduce stress and supporting normal behaviour, growth, and immune function.
These heaters are fully submersible and feature a thermostatically controlled heating system, allowing you to maintain temperatures between 16°C and 32°C. The external temperature adjustment knob and easy-to-read dial make it simple to set and monitor the desired temperature for your aquarium.
Built with durability and safety in mind, the heater incorporates high-quality flame retardant plastic, a heat resistant quartz tube, and reliable heating elements designed for long-term aquarium use.
Installation is straightforward thanks to the included strong suction cup mount, allowing the heater to be positioned vertically, horizontally, or at any angle depending on your aquarium setup. This flexibility makes it easy to place the heater discreetly within most aquariums while still ensuring effective heat distribution.
Manufactured by Pet Worx, an Australian company established in 1980, these heaters are designed to provide dependable performance for hobbyists maintaining both freshwater and marine aquariums.
Suitable for tropical, freshwater, and marine aquariums.
Available Sizes:
- 25W: Length 195mm – Suitable for aquariums up to 20L
- 50W: Length 195mm – Suitable for aquariums up to 40L
- 100W: Length 235mm – Suitable for aquariums up to 60L
- 200W: Length 300mm – Suitable for aquariums up to 150L
- 300W: Length 340mm – Suitable for aquariums up to 200L
Product Features:
- Fully submersible aquarium heater suitable for freshwater and marine aquariums
- Thermostatically controlled temperature range from 16°C to 32°C
- External adjustment knob with easy-to-read temperature dial
- Durable design with heat resistant quartz tube
- Built using high quality flame retardant plastic for improved safety
- Can be installed vertically, horizontally, or at any angle
- Easy installation using strong suction cup mounting bracket
- Reliable heating element designed for stable aquarium temperatures
- Suitable for both freshwater and saltwater aquariums
Product Specifications:
- Brand: Pet Worx
- Temperature Range: 16°C – 32°C
- Installation: Fully Submersible
- Mounting: Suction Cup Holder
- Material: Flame Retardant Plastic & Quartz Glass Tube
- Suitable For: Freshwater & Marine Aquariums
Items Included:
- 1x Petworx Heater
Pet Worx – Aquarium Heater
Pet Worx – Aquarium Heater
Low stock: 1 left
Why Shop With Us — Our Guarantee & Shipping Info
Why Shop With Us — Our Guarantee & Shipping Info
✅ Quality Products - Reliable aquarium supplies for your setup.
🚚 $11.95 Flat-rate shipping - safe & reliable delivery, arrives within 2-8 business days.
🤝 Trusted Couriers - Reliable delivery at a great rate.
💬 Expert Support - Got Questions? Chat with us anytime for advice!
🐟 Adding fish to your order? - Fish, Food and Plants ship separately from our dry good collections with our Live Arrival Guarantee. When ordering from both our dry goods and fish/food/plant collections, both shipping fees will apply (example: $30 fish & food + $11.95 dry goods = $41.95 total).
👉 For more details visit our Shipping page.
Tips Before You Buy — Product Guidance
Tips Before You Buy — Product Guidance
💡 Unsure which product is right for your tank? Visit our Education section or Blogs for help choosing the best equipment.
🐟 Beginners can start with: How to set up your aquarium, while everyone can check out Aquarium Maintenece & Care for ongoing tank tips!
🌿 Not all products are suitable for every tank size — Double-check dimensions and specifications before purchasing.
✍️ If you’re stuck: Reach out through our chat — we’re happy to help!
Looking for healthy, Aussie House-bred fish? 🐠 Browse our aquarium fish ready to ship Monday & Tuesday! Shop Fish.
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HEATER CALCULATOR
Tank Volume: Length × Width × Water Height (cm) ÷ 1,000 = Litres
ℹ️ Heater recommendations are based on standard indoor conditions. Results may vary depending on your room temperature, tank insulation, and lid type. If you're unsure, feel free to contact us before purchasing.
- Better tank matching Heater sizing is not always linear. Some heaters, including our Pet Worx range, are rated for specific tank volumes that can result in a larger jump in size for mid-range tanks. Using two smaller heaters can give you a more precise match for your tank size rather than stepping up to one oversized unit.
- Backup security If one heater fails, the second keeps your tank at a safe temperature while you replace it. A single heater failure overnight can be devastating for tropical fish.
- Eliminates cold zones A single heater placed at one end of a larger tank can leave the opposite end noticeably cooler. Two heaters placed at either end ensure even heat distribution throughout the entire tank.
- Reduces boil risk If a heater thermostat sticks on, a single large heater can rapidly overheat your tank. Two smaller heaters running at lower wattage each are less likely to cause catastrophic overheating if one malfunctions.
- More stable temperatures Two heaters working together maintain a more consistent water temperature with less fluctuation, which reduces stress on your fish.
These heaters are reliable, straightforward to use, and available in five wattages covering tanks from 20L all the way up to 200L, meaning there's an appropriate size for almost every setup we sell livestock for. They're one of the most accessible entry points into proper temperature control, and stable temperature is non-negotiable for tropical fish health.
Heater choice matters more than most people realise. A malfunctioning heater can overheat a tank rapidly, and by the time it's noticed the damage is often already done. It's one of the reasons we don't stock generic or unbranded heaters, we only carry brands we trust to perform consistently and safely over the long term.
Always unplug the heater at least 15 to 20 minutes before performing a water change and do not plug it back in until it is fully submerged again. Exposing a hot heater element to air, or running it out of water even briefly, can cause the quartz tube to crack or the element to fail.
Clean the exterior of the heater periodically by wiping it down with a soft cloth during water changes to remove algae and calcium build-up. Do not use abrasive cleaners or scrubbers on the quartz tube.
Check the temperature reading with a separate thermometer regularly rather than relying solely on the heater dial, as all thermostatic heaters can drift slightly over time. If the tank temperature is consistently above or below your target, adjust the dial accordingly and recheck after a few hours and adjust again if needed.
If you ever need to change aquarium temperature significantly, such as raising temperatures during white spot treatment, increase or decrease the temperature gradually at a rate of around 1°C per 1-2 hours. Sudden temperature swings can shock fish and cause additional stress, so slower adjustments are always the safer approach.
Position the heater near a point of water flow such as a filter outlet to ensure heat distributes evenly throughout the tank rather than concentrating in one area.
If the heater shows any signs of cracking, discolouration, condensation inside the tube, or electrical damage, discontinue use immediately and replace it as soon as possible.
Frequently Asked Questions
Which wattage do I need for my tank?
25W for up to 20L, 50W for up to 40L, 100W for up to 60L, 200W for up to 150L, and 300W for up to 200L. For tanks in cooler rooms or during winter, consider sizing up one wattage to ensure the heater can maintain temperature without running constantly.
What temperature range does it support?
16°C to 32°C, adjustable via the external dial. This covers coldwater, tropical, and most marine setups.
Can it be installed horizontally?
Yes. It can be mounted vertically, horizontally, or at any angle using the included suction cup bracket. Positioning it near a filter outlet helps distribute heat more evenly.
Is it safe to leave running all the time?
Yes, it is designed for continuous operation. Always unplug it at least 15 to 20 minutes before a water change and do not plug it back in until it is fully submerged again. Running the element out of water can crack the quartz tube.
Should I use a separate thermometer?
We recommend it. All thermostatic heaters can drift slightly over time, so checking with an independent thermometer periodically is good practice rather than relying solely on the dial.
