--- product_id: 2956715 title: "100W Submersible Aquarium Heater For 10-30 Gallon Fish Tanks" brand: "tetra" price: "€ 41.72" currency: EUR in_stock: true category: "Tetra" url: https://www.desertcart.hr/products/2956715-100w-submersible-aquarium-heater-for-10-30-gallon-fish-tanks store_origin: HR region: Croatia --- # Precise 78°F thermostat Dual-color heating indicator 100W powerful heating 100W Submersible Aquarium Heater For 10-30 Gallon Fish Tanks **Brand:** tetra **Price:** € 41.72 **Availability:** ✅ In Stock ## Summary > 🔥 Keep your tank perfectly cozy — because your fish deserve the best vibe! ## Quick Answers - **What is this?** 100W Submersible Aquarium Heater For 10-30 Gallon Fish Tanks by tetra - **How much does it cost?** € 41.72 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/2956715-100w-submersible-aquarium-heater-for-10-30-gallon-fish-tanks) ## 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 - • **Visual Heat Status:** Red and green indicator lights keep you effortlessly informed when heating is active or on standby. - • **Powerful & Efficient:** 100-watt heating capacity perfectly tailored for 10-30 gallon tanks, ensuring rapid temperature stabilization. - • **Durable & Safe Design:** Heat- and shock-resistant glass tube with silicon carbide crystals for superior heat distribution and longevity. - • **Effortless Installation:** Secure suction cup attachment means no hassle—just stick it inside your tank and enjoy peace of mind. - • **Consistent Comfort, Always:** Automatic thermostat maintains a steady 78°F for your aquatic friends’ ideal habitat. ## Overview The Tetra 100W Submersible Aquarium Heater is a UL-listed, durable heating solution designed for 10-30 gallon tanks. Featuring an automatic electronic thermostat that maintains a consistent 78°F, it prevents overheating and extends heater life. Dual-color indicator lights provide clear heating status, while a shock-resistant glass tube and silicon carbide crystals ensure efficient heat distribution. Easy to install with a secure suction cup, this heater is trusted by fish enthusiasts for reliable, hassle-free temperature control. ## 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 - AQUARIUM HEATER: Submersible heater is designed to keep your aquarium at the optimum temperature. - AUTOMATIC THERMOSTAT: Electronic thermostat keeps water at a consistent 78 degrees. - INDICATOR LIGHT: The red light shows when water is heating; green indicates that the heater is on standby. - EASY TO USE: Just attach to an aquarium wall – the suction cup securely attaches heater to tank. - SIZE: Use this 100-watt heater for 10 to 30 gallon aquariums – UL Listed. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B000OQRJSG | | ASIN | B000OQRJSG | | Batteries | Product Specific batteries required. | | Best Sellers Rank | #7,099 in Pet Supplies ( See Top 100 in Pet Supplies ) #11 in Aquarium Heaters | | Brand Name | Tetra | | Color | Black | | Customer Reviews | 4.4 4.4 out of 5 stars (16,788) | | Date First Available | March 22, 2007 | | Department | Unisex-Adult | | Global Trade Identification Number | 00046798264460 | | Included Components | Aquaria 75026446: Tetra Submersible Aquarium Heater 100Wt | | Item Type Name | Aquarium Heater | | Item Weight | 5.6 ounces | | Item model number | 26446 | | Manufacturer | Tetra | | Manufacturer | Tetra | | Material Type | Alloy Steel, Plastic | | Model Number | 26446 | | Number of Items | 1 | | Part Number | AQ-26446 | | Product Dimensions | 1.63 x 3.5 x 8.25 inches; 5.6 ounces | | UPC | 046798264460 | | Unit Count | 1 Count | | Warranty Description | See label | | Wattage | 100 watts | ## Product Details - **Brand:** Tetra - **Color:** Black - **Item Weight:** 5.6 ounces - **Material:** Alloy Steel, Plastic - **Wattage:** 100 watts ## Images ![100W Submersible Aquarium Heater For 10-30 Gallon Fish Tanks - Image 1](https://m.media-amazon.com/images/I/81Ic0gLmBNL.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 26446 HT Submersible Aquarium Heater With Electronic Thermostat, 100-Watt, Multicolor, 10-30 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/2956715-100w-submersible-aquarium-heater-for-10-30-gallon-fish-tanks](https://www.desertcart.hr/products/2956715-100w-submersible-aquarium-heater-for-10-30-gallon-fish-tanks) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-09-01*