--- product_id: 369760291 title: "P25 Submersible Aquarium Heater for Up to 6 Gallons, 25 Watts" brand: "fluval" price: "€ 79.82" currency: EUR in_stock: true reviews_count: 7 category: "Fluval" url: https://www.desertcart.hr/products/369760291-p25-submersible-aquarium-heater-for-up-to-6-gallons-25 store_origin: HR region: Croatia --- # Fully submersible & waterproof Stable 76-78°F preset temp Shatterproof polymer build P25 Submersible Aquarium Heater for Up to 6 Gallons, 25 Watts **Brand:** fluval **Price:** € 79.82 **Availability:** ✅ In Stock ## Summary > 🌊 Keep your nano world perfectly cozy—because your aquatic ecosystem deserves the best! ## Quick Answers - **What is this?** P25 Submersible Aquarium Heater for Up to 6 Gallons, 25 Watts by fluval - **How much does it cost?** € 79.82 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/369760291-p25-submersible-aquarium-heater-for-up-to-6-gallons-25) ## Best For - fluval enthusiasts ## Why This Product - Trusted fluval brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Seamless Integration:** Compact, fully submersible design fits discreetly in any nano aquarium up to 6 gallons. - • **Instant Status Insight:** LED indicator glows when heating, so you’re always in control without guesswork. - • **Effortless Precision Heating:** Preset 76-78°F ensures perfect tropical conditions—no fiddling required. - • **Versatile Nano Tank Essential:** Ideal for bettas, shrimp, nano reefs, and planted tanks—freshwater or saltwater. - • **Built to Last, Built for Safety:** Durable shatterproof polymer protects your aquatic friends and tank integrity. ## Overview The P25 Submersible Aquarium Heater delivers reliable, preset temperature control (76-78°F) for tanks up to 6 gallons. Its shatterproof polymer construction ensures durability and safety, while the fully waterproof design allows discreet placement in freshwater or saltwater nano aquariums. An LED indicator provides real-time heating status, making it the perfect compact heater for bettas, shrimp, and planted tanks. ## Description Keep your small aquarium at the perfect temperature with the P25 Submersible Aquarium Heater. This 25W heater is pre-set to 76-78°F (24-26°C) for effortless, worry-free use in nano aquariums. Built with a shatterproof polymer exterior, it ensures safety and durability for both freshwater and saltwater tanks up to 6 gallons (25L). Its fully submersible, waterproof design allows flexible placement, while the LED indicator shows when it's actively heating. Review: Dangerous Heater – Electrocuted My Betta - I bought the Fluval P25 submersible heater to keep my betta warm. After just 6 months of use, the heater cracked underwater and sadly electrocuted my betta to death. When I inspected the heater, I found visible cracks in the plastic. I’ve attached images showing the damage. After this incident, I researched online and found multiple reports on Reddit and aquarium forums like Reef2Reef from other users who had similar dangerous experiences with this heater. I can’t post links here, but you can search “fluval p25 heater cracked” on Google and see for yourself. This is unacceptable for any aquarium product, especially when it risks the lives of our pets. Please be cautious and consider safer alternatives. Review: Not as advertised - Fluval is supposed to be a good company but I can't keep my Aquarium Temperature bove 24 degrees. The Fluval Aquarium Heater is covered by plastic. Hence it keeps switching off after every few seconds. It is therefore unable to adequately heat the 10 gallon tank. I am disappointed at the poor design and inadequate heating. 😔 ## Features - Preset Temperature for Easy Use: No adjustments needed! The P25 heater maintains a stable 76-78°F (24-26°C), providing an ideal environment for tropical fish in nano aquariums - Shatterproof & Durable Build: Strong polymer construction resists damage, keeping both your aquarium and aquatic life safe from potential breakage or overheating - Fully Submersible & Waterproof: Designed for effortless positioning, this compact heater fits discreetly inside any freshwater or saltwater tank up to 6 gallons (25L) - LED Indicator for Active Heating: The built-in LED light illuminates when the heater is in operation, so you always know when it's working to maintain a consistent water temperature - Reliable Heating for Small Tanks: Perfect for betta tanks, nano reefs, shrimp habitats, and planted aquariums, ensuring stable, uniform heating in both freshwater and saltwater setups ## Technical Specifications | Specification | Value | |---------------|-------| | Manufacturer | Rolf C. Hagen (USA) Corp. | | Item model number | A744 | | Product Dimensions | 15 x 7 x 3 cm; 192 g | | ASIN | B084618P6D | ## Images ![P25 Submersible Aquarium Heater for Up to 6 Gallons, 25 Watts - Image 1](https://m.media-amazon.com/images/I/61p90wDaxML.jpg) ## Customer Reviews ### ⭐ Dangerous Heater – Electrocuted My Betta *by N***J on 11 April 2025* I bought the Fluval P25 submersible heater to keep my betta warm. After just 6 months of use, the heater cracked underwater and sadly electrocuted my betta to death. When I inspected the heater, I found visible cracks in the plastic. I’ve attached images showing the damage. After this incident, I researched online and found multiple reports on Reddit and aquarium forums like Reef2Reef from other users who had similar dangerous experiences with this heater. I can’t post links here, but you can search “fluval p25 heater cracked” on Google and see for yourself. This is unacceptable for any aquarium product, especially when it risks the lives of our pets. Please be cautious and consider safer alternatives. ### ⭐ Not as advertised *by S***A on 24 December 2024* Fluval is supposed to be a good company but I can't keep my Aquarium Temperature bove 24 degrees. The Fluval Aquarium Heater is covered by plastic. Hence it keeps switching off after every few seconds. It is therefore unable to adequately heat the 10 gallon tank. I am disappointed at the poor design and inadequate heating. 😔 ### ⭐⭐⭐⭐⭐ Good enough *by D***S on 10 May 2024* I don't know about its durability and how reliable this product is, but so far so good. It does what's supposed to do and it takes very little space in my 20l tank. Just plug it in and let it do its job. ## Frequently Bought Together - Fluval P25 Submersible Aquarium Heater for Up to 6 Gallons, 25 Watts - Fluval SPEC Aquarium Kit, Aquarium with LED Lighting and 3-Stage Filtration System, 5-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 --- ## 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/369760291-p25-submersible-aquarium-heater-for-up-to-6-gallons-25](https://www.desertcart.hr/products/369760291-p25-submersible-aquarium-heater-for-up-to-6-gallons-25) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-07-25*