--- product_id: 2118461 title: "Tetra(R) HT Submersible Aquarium Heater" brand: "tetra" price: "€ 36.59" currency: EUR in_stock: true category: "Tetra" url: https://www.desertcart.gr/products/2118461-tetra-r-ht-submersible-aquarium-heater store_origin: GR region: Greece --- # Dual-color indicator light 50W precise heating Auto shut-off safety Tetra(R) HT Submersible Aquarium Heater **Brand:** tetra **Price:** € 36.59 **Availability:** ✅ In Stock ## Summary > 🔥 Keep your aquatic friends cozy with precision and peace of mind! ## Quick Answers - **What is this?** Tetra(R) HT Submersible Aquarium Heater by tetra - **How much does it cost?** € 36.59 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/products/2118461-tetra-r-ht-submersible-aquarium-heater) ## 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 - • **Safety First:** Automatic shut-off on electrical shorts protects your aquatic environment. - • **Durable & Reliable:** Heat and shock-resistant glass with silicon carbide crystals for even heat distribution. - • **Sleek & Submersible:** Compact design fits discreetly in 2-10 gallon tanks, install vertically or horizontally. - • **Visual Heating Status:** Red and green indicator lights keep you informed at a glance. - • **Effortless Temperature Control:** Built-in electronic thermostat maintains a perfect 78°F—no adjustments needed. ## Overview The Tetra® HT Submersible Aquarium Heater is a 50-watt, fully submersible heater designed for 2 to 10 gallon tanks. Featuring a built-in electronic thermostat preset to 78°F, it ensures stable tropical fish-friendly temperatures without manual adjustments. Its dual-color indicator light signals heating status, while an automatic shut-off protects against electrical shorts. Constructed with heat and shock-resistant glass and enhanced with silicon carbide crystals for optimal heat transfer, this compact heater installs easily with a suction cup and fits discreetly behind aquarium décor. Backed by a two-year warranty and UL listing, it’s 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. ## 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 | | ASIN | B000OQO69Q | | Batteries | Product Specific batteries required. | | Best Sellers Rank | #9,561 in Pet Supplies ( See Top 100 in Pet Supplies ) #14 in Aquarium Heaters | | Brand Name | Tetra | | Color | Black | | Customer Reviews | 4.4 4.4 out of 5 stars (16,751) | | Date First Available | March 22, 2007 | | Department | Unisex-Adult | | Global Trade Identification Number | 00046798264477 | | Included Components | Aquaria 75026447: Tetra Submersible Aquarium Heater 50Wt | | Is Discontinued By Manufacturer | No | | Item Type Name | Aquarium Heater | | Item Weight | 7.84 ounces | | Item model number | 26447 | | Manufacturer | Tetra | | Manufacturer | Tetra | | Manufacturer recommended age | 1 month and up | | Material Type | glass | | Model Number | 26447 | | Part Number | AQ-26447 | | Product Dimensions | 5.25 x 1.62 x 3.5 inches; 7.84 ounces | | 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 ![Tetra(R) HT Submersible Aquarium Heater - 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 ## 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.gr/products/2118461-tetra-r-ht-submersible-aquarium-heater](https://www.desertcart.gr/products/2118461-tetra-r-ht-submersible-aquarium-heater) --- *Product available on Desertcart Greece* *Store origin: GR* *Last updated: 2026-06-20*