--- product_id: 49524873 title: "Interpet Deltatherm Aquarium Fish Tank Heater, adjustable, for Tropical and Marine, 50 W, for aquariums up to 45 litres" brand: "interpet" price: "R1157" currency: ZAR in_stock: true reviews_count: 12 url: https://www.desertcart.co.za/products/49524873-interpet-deltatherm-aquarium-fish-tank-heater-adjustable-for-tropical-marine store_origin: ZA region: South Africa --- # Fully submersible & double insulated 50W precise heating Adjustable temp dial ±2°C Interpet Deltatherm Aquarium Fish Tank Heater, adjustable, for Tropical and Marine, 50 W, for aquariums up to 45 litres **Brand:** interpet **Price:** R1157 **Availability:** ✅ In Stock ## Summary > 🔥 Keep your aquatic world perfectly cozy—because your fish deserve the best! ## Quick Answers - **What is this?** Interpet Deltatherm Aquarium Fish Tank Heater, adjustable, for Tropical and Marine, 50 W, for aquariums up to 45 litres by interpet - **How much does it cost?** R1157 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/49524873-interpet-deltatherm-aquarium-fish-tank-heater-adjustable-for-tropical-marine) ## Best For - interpet enthusiasts ## Why This Product - Trusted interpet brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Compact & Powerful:** 50 watts of efficient heating designed for aquariums up to 45 litres—ideal for desktop or home office setups. - • **Safe & Durable Design:** Double insulated and fully submersible for worry-free underwater operation and long-lasting performance. - • **Effortless Installation:** Includes secure suction mounts and a simple dial control—get your aquarium thriving in minutes. - • **Universal Compatibility:** Works seamlessly with both freshwater and marine environments, supporting all life stages. - • **Precision Temperature Control:** Dial in the perfect 24°C habitat for your tropical or marine fish with ease. ## Overview The Interpet Deltatherm Aquarium Fish Tank Heater is a 50W, fully submersible heater designed for tropical and marine aquariums up to 45 litres. Featuring precise temperature control with an adjustable dial, double insulation for safety, and compatibility with all life stages, it ensures a stable and healthy environment for your aquatic pets. Compact and easy to install, it’s the trusted choice for maintaining ideal water temperatures in home and office aquariums. ## Description The heater recommended will maintain a temperature up to 26⁰C in a well heated home. If the aquarium is in a cold location or over 26⁰C is required select the next highest wattage. Ensure you get the correct size Deltatherm Heater for your aquarium: Check that the voltage of the mains supply corresponds to the voltage shown on the heater. Fix the suckers to the heater and adjust the temperature control dial to the desired setting. The heater is set to 24⁰ the ideal temperature for most tropical fish. However, if you require a higher or lower setting this is easily achieved by adjusting the dial on the top of the heater. You should never adjust the temperature by more than +/-2⁰C at one time if there are fish in the aquarium. ## Features - Heating system designed for tropical aquariums - Precise and reliable temperature control - Double insulated and fully submersible - Ideal for marine and freshwater fish - 50 Watts for aquariums up to 46cm/45 litres (18”/10 gallons) - Age range description: All Life Stages. Special features: Underwater. ## Technical Specifications | Specification | Value | |---------------|-------| | Amperage | 0.22 Amps | | Asin | B003VZ3MC4 | | Best Sellers Rank | 4,625 in Pet Supplies (See Top 100 in Pet Supplies) 6 in Aquarium Heaters | | Brand Name | Interpet | | Colour | Black | | Country Of Origin | China | | Customer Reviews | 4.4 4.4 out of 5 stars (284) 4.4 out of 5 stars | | Form Factor | Underwater | | Fuel Type | Electric | | Global Trade Identification Number | 00755349016402 | | Heat Output | 300 Watts | | Heating Coverage | 150 square feet | | Heating Element | Radiant | | Heating Method | Convection | | Included Components | See Description | | Indoor Outdoor Usage | Indoor | | Item Dimensions D X W X H | 263D x 25W x 25H millimetres | | Item Type Name | Interpet Deltatherm Aquarium Fish Tank Heater, adjustable, for Tropical and Marine, 50 W, for aquariums up to 45 litres | | Item Weight | 0.31 Kilograms | | Manufacturer | Interpet | | Maximum Temperature Setting | 24 Degrees Celsius | | Min Temperature Setting | 12 Degrees Celsius | | Model Number | 1640 | | Mounting Type | Tabletop Mount | | Number Of Items | 1 | | Number Of Packs | 1 | | Part Number | 1640 | | Power Source | Corded Electric | | Product Warranty | Manufacturer fault. | | Recommended Uses For Product | Aquarium | | Room Type | Bedroom, Home Office | | Special Features | Underwater | | Unit Count | 1 count | | Upc | 755349016402 | | Voltage | 230 Volts | ## Product Details - **Brand:** Interpet - **Colour:** Black - **Form factor:** Underwater - **Indoor/Outdoor usage:** Indoor - **Special feature:** Underwater ## Images ![Interpet Deltatherm Aquarium Fish Tank Heater, adjustable, for Tropical and Marine, 50 W, for aquariums up to 45 litres - Image 1](https://m.media-amazon.com/images/I/71FtgJDuyTS.jpg) ## Available Options This product comes in different **Size** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Brilliant aquarium heater. *by on Reviewed in the United Kingdom 14 December 2011* I purchased this product for my 19 litre tropical aquarium (it was recommended as the tank is also a product of Interpet.)So far, it has been brilliant. You can see when it's adjusting the water's temperature because of the red light switching on during heating, which is reassuring. I have a rather cold bedroom (where my fish tank is) and the heater seems to be on quite a lot, however, the fish (3 guppies and 2 danios) are comfortable and happy, and have been for a very long time so it must be doing it's job.I can tell the water is warm from touching the glass and putting my finger in the water. I do not, however, have another thermometer to check the temperature so I cannot tell the accuracy of the heater, but as I mentioned, it's always seems right.Setting the temperature is easy too, it's simply twisting the cap this way, or that way, depending on the temperature you want.It's very durable and has stayed stuck to the glass, never had a problem and forget it's there. It's rather big, but I have a small fish tank so it probably just seems that way to me.The power adapter is not too long, but it's not too short either, this can be easily fixed by an extension cord, of course, and the power adapter's WIRE can be submersed if need be safely.Overall, I would definitely recommend this heater to anyone, it's from a reliable company and does it's job very well. I can't say whether it will be good in experienced or bigger/complex tanks but for startup/simple tanks, this is an exceptional product. ### ⭐⭐⭐⭐ So far so good.. *by on Reviewed in the United Kingdom 26 November 2012* The extremely negative review almost ended the purchase. I reasoned that the issues experienced had to be unusual. And so far this appears to be the case. I checked the unit carefully before use. Although no living creatures were being put at risk, living organisms were in jeopardy. Namely the yeast in my batch of fermenting beer. Proof will be in the drinking.The device is keeping temperature steady and consistent and so gets a thumbs up from me. No five star rating because I felt the temperature control could have been delineated in some way making it easier to duplicate the best temperature setting for measured volumes. However, this aside, it is pretty straightforward to operate so maybe I am being pedantic! ### ⭐⭐⭐⭐⭐ Great little heater *by on Reviewed in the United Kingdom 10 May 2026* Works great! Have used the smaller versions before and needed to upgrade. --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.za/products/49524873-interpet-deltatherm-aquarium-fish-tank-heater-adjustable-for-tropical-marine](https://www.desertcart.co.za/products/49524873-interpet-deltatherm-aquarium-fish-tank-heater-adjustable-for-tropical-marine) --- *Product available on Desertcart South Africa* *Store origin: ZA* *Last updated: 2026-10-09*