Heating & Cooling

Ensure optimal water temperature for your aquarium with our rage of heaters and chillers, offering reliable temperature control to create a comfortable and stable environment for your fish and aquatic life. With user-friendly features and state-of-the-art technology, our aquarium heaters guarantee hassle-free operation, allowing you to focus on enjoying your underwater world. Whether you have a marine or freshwater setup, our heating and cooling products will meet the unique needs of your aquarium, promoting the well-being and health of your aquatic inhabitants.

Ensure optimal water temperature for your aquarium with our rage of heaters and chillers, offering reliable temperature control to create a comfortable and stable environment for your fish and aquatic life. With user-friendly features and state-of-the-art technology, our aquarium heaters guarantee hassle-free operation, allowing you to focus on enjoying your underwater world. Whether you have a marine or freshwater setup, our heating and cooling products will meet the unique needs of your aquarium, promoting the well-being and health of your aquatic inhabitants.

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 Have questions about Heating & Cooling? Checkout out our FAQ!

Choosing the Right Heater for Your Aquarium (Freshwater & Marine)

A stable temperature is vital for the health and comfort of your aquarium inhabitants. Whether you keep tropical freshwater fish or sensitive marine corals, the right heater ensures consistency—esp... read more
A stable temperature is vital for the health and comfort of your aquarium inhabitants. Whether you keep tropical freshwater fish or sensitive marine corals, the right heater ensures consistency—especially in... read less

Effective Cooling Methods for Freshwater & Marine Aquariums

Maintaining stable water temperature is crucial in both freshwater and marine aquariums. While heating is essential in colder months, overheating is just as dangerous, especially during summer or w... read more
Maintaining stable water temperature is crucial in both freshwater and marine aquariums. While heating is essential in colder months, overheating is just as dangerous, especially during summer or when using... read less

Advice Ideal Temperature Ranges for Freshwater & Marine Species

One of the most critical aspects of aquarium care—whether for freshwater or marine systems—is maintaining a stable and species-appropriate temperature. Each fish, plant, coral, or invertebrate thri... read more
One of the most critical aspects of aquarium care—whether for freshwater or marine systems—is maintaining a stable and species-appropriate temperature. Each fish, plant, coral, or invertebrate thrives within a specific... read less

Choosing the Right Heater for Your Aquarium (Freshwater & Marine)

A stable temperature is vital for the health and comfort of your aquarium inhabitants. Whether you keep tropical freshwater fish or sensitive marine corals, the right heater ensures consistency—esp... read more
A stable temperature is vital for the health and comfort of your aquarium inhabitants. Whether you keep tropical freshwater fish or sensitive marine corals, the right heater ensures consistency—especially in... read less

Effective Cooling Methods for Freshwater & Marine Aquariums

Maintaining stable water temperature is crucial in both freshwater and marine aquariums. While heating is essential in colder months, overheating is just as dangerous, especially during summer or w... read more
Maintaining stable water temperature is crucial in both freshwater and marine aquariums. While heating is essential in colder months, overheating is just as dangerous, especially during summer or when using... read less

Advice Ideal Temperature Ranges for Freshwater & Marine Species

One of the most critical aspects of aquarium care—whether for freshwater or marine systems—is maintaining a stable and species-appropriate temperature. Each fish, plant, coral, or invertebrate thri... read more
One of the most critical aspects of aquarium care—whether for freshwater or marine systems—is maintaining a stable and species-appropriate temperature. Each fish, plant, coral, or invertebrate thrives within a specific... read less

Comparison Table

Product Type Power/Wattage Temperature Range Control Features Special Features Suitable for Aquarium Size Price
Eheim Jager Aquarium Heater Submersible Heater 50W, 100W, 150W, 200W, 250W, 300W 18–34°C (64–93°F) Adjustable temperature dial Thermo safety control; shatterproof glass Up to 1000 liters £20–£30
Fluval E Series Advanced Electronic Heater Submersible Heater 50W, 100W, 200W, 300W 20–34°C (68–93°F) Digital microprocessor with LCD display Dual temperature sensors; fast heat technology Up to 375 liters £40–£60
Aquael Ultra Heater Submersible Heater 25W, 50W, 75W, 100W, 150W, 200W 20–33°C (68–91°F) Electronic thermostat with LED indicator Shatterproof; precise temperature maintenance Up to 200 liters £25–£35
D-D Titanium Heater Submersible Heater 300W, 600W Pre-set thermostat required External temperature controller (sold separately) Corrosion-resistant titanium; suitable for marine and freshwater Up to 1000 liters £70–£100
Teco TK 500 Chiller Aquarium Chiller 1/6 HP Cooling only Digital thermostat with LCD display Energy efficient; low noise operation Up to 500 liters £700–£800

Have Questions About Heating & Cooling?
We Have Answers.

Get quick answers to common questions about Heating & Cooling

Do I need a heater for my freshwater aquarium?

Yes—if you’re keeping tropical fish, a heater is essential to maintain a stable water temperature, typically between 24–27°C (75–81°F). Coldwater species like goldfish may not need a heater, but it’s always important to maintain consistent conditions year-round.

What size heater should I buy for my tank?

The general rule is 1 watt per litre of water. For example, a 100-litre tank requires a 100W heater. Larger tanks or those in cooler environments may benefit from using two smaller heaters for even heat distribution and added safety.

Are digital heaters more accurate than analog ones?

Yes. Digital or electronic heaters often come with thermostatic control and temperature displays, offering more precise regulation and easier monitoring. Models like the Fluval E Series or Aquael Ultra Heater are great choices for accuracy and ease of use.

What is the best way to cool my aquarium in summer?

For mild heat, cooling fans that increase evaporation can lower temperature by 1–3°C. For larger tanks or setups with heat-sensitive species like shrimp or axolotls, an aquarium chiller is the most reliable way to maintain precise temperature control.

Can I use a heater and a cooler together?

Yes, especially in environments with wide temperature swings. Use a dual-stage temperature controller to manage both devices automatically—ensuring your tank stays within a safe range without constant manual adjustments.

How do I know if my heater is working properly?

Check your water temperature with a reliable digital thermometer and ensure it matches the heater setting. Signs of a malfunctioning heater include unstable temperatures, condensation inside the heater casing, or fish showing signs of stress (e.g., rapid gill movement, hiding).

Are titanium heaters better than glass heaters?

Titanium heaters, like those from D-D, are shatterproof, corrosion-resistant, and ideal for large or high-value setups. They are especially recommended for tanks with larger fish, high water flow, or where equipment may be exposed to impact.

How often should I replace my heater or chiller?

With proper maintenance, quality heaters and chillers can last 3–5 years or longer. However, it’s smart to replace older units proactively—especially in fully stocked or sensitive tanks—before they fail unexpectedly.

What temperature should I aim for in a planted freshwater tank?

Most aquatic plants thrive at 22–26°C (72–79°F). Make sure your lighting, CO₂, and nutrients are also balanced to avoid algae issues at warmer temperatures.

Can a faulty heater harm my fish?

Unfortunately, yes. A heater stuck “on” or “off” can cause temperature shock, which is dangerous for fish and invertebrates. That’s why external controllers and backup thermometers are highly recommended for peace of mind.

Keep Your Aquarium Comfortable Year-Round with Freshwater Heating & Cooling Solutions

Maintaining the right water temperature is essential for the health and wellbeing of your freshwater fish, plants, and invertebrates. At Charterhouse Aquatics, we offer a complete range of aquarium heaters, chillers, cooling fans, and temperature controllers to help you keep your aquarium stable in every season.

Whether you’re looking for a precise digital heater, a shatterproof model for peace of mind, or a high-performance chiller to beat summer heat, we have solutions for every tank size and setup. Explore trusted brands like Eheim, Fluval, Aquael, D-D, and Teco—all known for their reliability, safety, and ease of use.

Not sure which product suits your needs? Our expert team is here to help with advice on wattage, tank compatibility, and setup recommendations. Enjoy fast UK delivery, competitive prices, and top-quality support when you shop freshwater heating and cooling at Charterhouse Aquatics.Keep Your Aquarium Comfortable Year-Round with Freshwater Heating & Cooling Solutions