--- product_id: 2118461 title: "HT Submersible Aquarium Heater With Electronic Thermostat, 50-Watt, 2-10 Gallon" brand: "tetra" price: "€ 42.85" currency: EUR in_stock: true reviews_count: 13 category: "Tetra" url: https://www.desertcart.hr/products/2118461-ht-submersible-aquarium-heater-with-electronic-thermostat-50-watt-2 store_origin: HR region: Croatia --- # Dual-color indicator light Auto shut-off safety 50W precise heating HT Submersible Aquarium Heater With Electronic Thermostat, 50-Watt, 2-10 Gallon **Brand:** tetra **Price:** € 42.85 **Availability:** ✅ In Stock ## Summary > 🔥 Keep your tropical fish thriving with precision warmth and peace of mind! ## Quick Answers - **What is this?** HT Submersible Aquarium Heater With Electronic Thermostat, 50-Watt, 2-10 Gallon by tetra - **How much does it cost?** € 42.85 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/2118461-ht-submersible-aquarium-heater-with-electronic-thermostat-50-watt-2) ## Best For - tetra enthusiasts ## Why This Product - Trusted tetra brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Durable & Reliable:** Heat and shock-resistant glass with silicon carbide crystals ensures even heat distribution and long-lasting performance. - • **Safety First, Always:** Automatic shut-off triggers instantly if electrical shorts are detected, protecting your aquatic ecosystem. - • **Visual Heating Status:** Red and green indicator lights keep you informed at a glance—know exactly when your tank is heating or stable. - • **Sleek & Discreet Design:** Compact, fully submersible heater fits seamlessly in 2-10 gallon tanks, hiding behind décor without disrupting aesthetics. - • **Effortless Temperature Control:** Built-in electronic thermostat maintains a perfect 78°F—no manual adjustments needed. ## Overview The Tetra HT 50-Watt Submersible Aquarium Heater is engineered for 2-10 gallon tanks, featuring an electronic thermostat that automatically maintains an ideal 78°F temperature. Its dual-color indicator lights provide real-time heating status, while built-in safety shut-off protects against electrical faults. Compact and fully submersible, this durable glass heater offers reliable, even heat distribution with silicon carbide technology, making it a trusted choice for both novice and experienced aquarists. ## Description Tetra® HT Submersible Heater is designed to keep your aquatic fish comfortable, with an electronic thermostat that automatically maintains a consistent water temperature of 78 degrees and prevents overheating, extending heater life. An indicator light lets you know when the water is heating (red light) and when it reaches the proper temperature (green light). Inside, silicon carbide crystals improve heat distribution and transfer. The strong glass tube is heat and shock resistant. This submersible heater is easy to use – just attach to the inside of the aquarium wall using the suction cup (included) in an area with good water circulation. The Tetra HT Submersible Heater is available in different wattages to fit your aquarium: use the 50-watt HT10 in 2 to 10 gallon aquariums; 100-watt HT30 for 10 to 30 gallons; 150-watt HT40 for 30 to 40 gallons; and 200-watt HT55 for 40 to 55 gallons. This heater is UL Listed. Since 1951, Tetra has developed the world’s most comprehensive body of fish food knowledge, and fishkeeping enthusiasts have looked to the brand for products and solutions that add ease and beauty to their home. Whether you're an experienced hobbyist or just starting out, Tetra has everything you need – from a large variety of quality fish food and innovative equipment to test kits and decor. Review: Great price, fast delivery. - ★★★★★ Great Product! I'm very happy with this purchase. The product arrived on time, was exactly as described, and met my expectations. The quality is excellent, it's easy to use, and it works as intended. I appreciate the value for the price and would definitely purchase it again. I highly recommend this product to anyone looking for a reliable and well-made item. Review: Follow instructions - This is not to be used in a small bowl. Please listen to what the instructions say. It did not work out for me at all but it was user error. The product itself worked fine. ## Features - All Tetra HT heaters have indicator lights to let you know when the heater is on. It will be red when heating and green when the proper temperature has been reached..All Tetra HT Heaters will shut off if an electrical short is detected for your safety. - The HT10 uses a built in electronic theromstat to automatically maintain water at 78° F which is ideal for most tropical fish. No adjustment is requried. - Ideal for aquariums between 2 to 10 gallons with hoods or glass canopies - The HT heater is fully submersbile and can be installed vertically or horizontally. It's small footprint makes it easy to conceal behind plants or other décor. - Please read all label information upon delivery. DO NOT plug heater into an electrical outlet until it is placed inside the aquarium. - All Tetra HT Heaters will shut off if an electrical short is detected for your safety. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B000OQO69Q | | Best Sellers Rank | #8,867 in Pet Supplies ( See Top 100 in Pet Supplies ) #11 in Aquarium Heaters | | Brand | Tetra | | Brand Name | Tetra | | Color | Black | | Customer Reviews | 4.4 out of 5 stars 16,772 Reviews | | Global Trade Identification Number | 00046798264477 | | Included Components | Aquaria 75026447: Tetra Submersible Aquarium Heater 50Wt | | Item Type Name | Aquarium Heater | | Item Weight | 0.49 Pounds | | Manufacturer | Tetra | | Material | glass | | Material Type | glass | | Model Number | 26447 | | Part Number | AQ-26447 | | UPC | 046798264477 | | Unit Count | 1 Count | | Warranty Description | Two year warranty | | Wattage | 50 watts | ## Product Details - **Brand:** Tetra - **Color:** Black - **Item Weight:** 7.84 ounces - **Material:** glass - **Wattage:** 50 watts ## Images ![HT Submersible Aquarium Heater With Electronic Thermostat, 50-Watt, 2-10 Gallon - Image 1](https://m.media-amazon.com/images/I/71CH35bZjVL.jpg) ## Available Options This product comes in different **Size** options. ## Questions & Answers **Q: would this work in a one gallon tank?** A: I wouldnt because the temp on this can go up to 79 degrees in a 10 gallon tank, for that reason i purchased a 10 watt for my 1 gallon tank and it keeps the tank at a perfect temp of 78. Check out the Marina C10 Submersible on Amazon for $10.00. **Q: Description says "the ht30 is adjustable between 72 degrees f and 85 degrees f". ok, why does the one i received say not adjustable, preset at 78?** A: All of the HT Heaters are preset now. Unfortunately, this is an old image and old description of the former HT 55. The description seems to have been translated to the HT 100 as well. Tetra is working to correct these issues immediately. We appreciate your bringing it to our attention. If you need any other assistance, please contact the Tetra Consumer Relations Team at 1-800-526-0650. **Q: Will this be okay in a 3 gallon betta bowl i'm making? if not any recomendations?** A: Yea i think so. I seriously look at this every day and im sooooooooooo glad i bought it. My betta looked so depressed before in his bowl because my house gets down to 60 degrees and his water was getting cold and now he is so happy his water stays 78 and he swims like a happy fish and has a lot of bubbles on top (means there happy). Its so crazy that warmer* water can make a fish soooo happy. This is a must. Yes buy it for a 3 gallon tank- i think it will work just fine and your fish will LOVE IT i promise! Let me know how it works out for you- because im so glad i got it! **Q: Does it turns off automatically** A: When it reaches the right temp. it automatically shuts off. When the light on it is green, it's heating; when the light is red, it's off ## Customer Reviews ### ⭐⭐⭐⭐⭐ Great price, fast delivery. *by S***E on July 1, 2026* ★★★★★ Great Product! I'm very happy with this purchase. The product arrived on time, was exactly as described, and met my expectations. The quality is excellent, it's easy to use, and it works as intended. I appreciate the value for the price and would definitely purchase it again. I highly recommend this product to anyone looking for a reliable and well-made item. ### ⭐⭐⭐⭐⭐ Follow instructions *by E***O on June 28, 2026* This is not to be used in a small bowl. Please listen to what the instructions say. It did not work out for me at all but it was user error. The product itself worked fine. ### ⭐⭐⭐⭐⭐ Proven leader in fish tank equipment *by R***0 on June 12, 2026* Established expert in aquarium equipment at affordable prices for sure. The reliability of Tetra items is proven time and again, boosting fish health, tank appearance, and adjustable fit for most tank sizes. About an hour was all that was needed for this to warm a 20 gallon tank, and very accurate even when measured. Overall excellent water temperature maintenance for sensitive live bearing fish. ## Frequently Bought Together - Tetra HT Submersible Aquarium Heater With Electronic Thermostat, 50-Watt, 2-10 Gallon - PAIZOO Fish Tank Digital Thermometer Accurate LED Display to ±0.9°F Tank Thermometer Aquarium Temperature Measurement Suitable for Fish, Axolotl, Turtle or Aquatic - Tetra Water Cleaner Gravel Siphon for Aquariums, Easily Clean Freshwater Aquariums --- ## 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.hr/products/2118461-ht-submersible-aquarium-heater-with-electronic-thermostat-50-watt-2](https://www.desertcart.hr/products/2118461-ht-submersible-aquarium-heater-with-electronic-thermostat-50-watt-2) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-07-26*