---
product_id: 215897741
title: "P25 Submersible Aquarium Heater – 25W, Shatterproof & Fully Submersible, Preset 76-78°F for Freshwater & Saltwater Tanks up to 6 Gal, LED Indicator, Safe & Durable Nano Tank Heater"
brand: "fluval"
price: "$52.56"
currency: USD
in_stock: true
reviews_count: 13
category: "Fluval"
url: https://www.desertcart.us/products/215897741-p25-submersible-aquarium-heater-25w-shatterproof-and-fully-submersible-preset
store_origin: US
region: United States of America
---

# fully submersible & waterproof 25W stable heating shatterproof polymer build P25 Submersible Aquarium Heater – 25W, Shatterproof & Fully Submersible, Preset 76-78°F for Freshwater & Saltwater Tanks up to 6 Gal, LED Indicator, Safe & Durable Nano Tank Heater

**Brand:** fluval
**Price:** $52.56
**Availability:** ✅ In Stock

## Summary

> 🔥 Keep your nano tank cozy and your fish thriving — no guesswork, just perfect warmth!

## Quick Answers

- **What is this?** P25 Submersible Aquarium Heater – 25W, Shatterproof & Fully Submersible, Preset 76-78°F for Freshwater & Saltwater Tanks up to 6 Gal, LED Indicator, Safe & Durable Nano Tank Heater by fluval
- **How much does it cost?** $52.56 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/215897741-p25-submersible-aquarium-heater-25w-shatterproof-and-fully-submersible-preset)

## 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

- • **Built to Last:** Durable shatterproof polymer protects your aquatic environment
- • **Instant Status Check:** LED indicator glows when actively heating, so you’re always in control
- • **Seamless Integration:** Compact, fully submersible design fits discreetly in tanks up to 6 gallons
- • **Plug & Play Precision:** Preset 76-78°F thermostat for effortless, worry-free heating
- • **Versatile Compatibility:** Perfect for freshwater & saltwater nano tanks, bettas, shrimp, and planted aquariums

## Overview

The Fluval P25 is a 25W submersible aquarium heater preset to maintain a stable 76-78°F, ideal for freshwater and saltwater tanks up to 6 gallons. Its shatterproof polymer construction ensures durability and safety, while the waterproof design allows flexible placement. An LED indicator provides real-time heating status, making it the perfect hassle-free solution for nano aquariums, bettas, shrimp habitats, 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: Little beta blanket - This thing works like a charm! Just plug and play. Ever since I put it in my Fishtank, my little beta fish are so happy and warm. It’s automatically controlled by the thermostat set at the factory. I was a little freaked out at first when I thought of the idea of buying something that was controlled automatically, but no boiled fish yet! They’re warm and cozy and happy. If you’re on the fence about buying this for your beta fish, look no further than this heater. Buy your little beta fish a blanket before they freeze to death. I’ve been using it for about three months now and it’s held up so far. It’s the perfect size to fit into a 3 gallon aquarium.
Review: Perfect! - This is perfect for my 3 1/2 gallon beta tank! Keeps it the perfect temperature for him. His name is Gill.

## 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 |
|---------------|-------|
| ASIN | B084618P6D |
| ASIN  | B084618P6D |
| Age Range Description | All Life Stages |
| Best Sellers Rank | #21,439 in Pet Supplies ( See Top 100 in Pet Supplies ) #51 in Aquarium Heaters |
| Brand Name | Fluval |
| Color | Black |
| Customer Reviews | 4.1 4.1 out of 5 stars (711) |
| Date First Available | June 23, 2020 |
| Date First Available  | June 23, 2020 |
| Directions | Follow individual packaging instructions. |
| Included Components | All items listed in description |
| Item Dimensions LxWxH | 5.91 x 2.76 x 1.18 inches |
| Item Package Dimensions L x W x H | 9.49 x 3.31 x 2.32 inches |
| Item Weight | 0.19 Kilograms |
| Item model number | A744 |
| Item model number  | A744 |
| Manufacturer | Rolf C. Hagen (USA) Corp. |
| Manufacturer  | Rolf C. Hagen (USA) Corp. |
| Model Name | Fluval P25 Submersible Aquarium Heater |
| Product Dimensions  | 5.91 x 2.76 x 1.18 inches; 6.77 ounces |
| Size | P25 |
| Specific Uses for Product | Indoor |
| Target Audience Keyword | Fish |
| Warranty Description | 2 Year Limited Warranty |

## Images

![P25 Submersible Aquarium Heater – 25W, Shatterproof & Fully Submersible, Preset 76-78°F for Freshwater & Saltwater Tanks up to 6 Gal, LED Indicator, Safe & Durable Nano Tank Heater - Image 1](https://m.media-amazon.com/images/I/61p90wDaxML.jpg)

## Available Options

This product comes in different **Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Little beta blanket
*by A***R on October 31, 2023*

This thing works like a charm! Just plug and play. Ever since I put it in my Fishtank, my little beta fish are so happy and warm. It’s automatically controlled by the thermostat set at the factory. I was a little freaked out at first when I thought of the idea of buying something that was controlled automatically, but no boiled fish yet! They’re warm and cozy and happy. If you’re on the fence about buying this for your beta fish, look no further than this heater. Buy your little beta fish a blanket before they freeze to death. I’ve been using it for about three months now and it’s held up so far. It’s the perfect size to fit into a 3 gallon aquarium.

### ⭐⭐⭐⭐⭐ Perfect!
*by B***P on February 12, 2025*

This is perfect for my 3 1/2 gallon beta tank! Keeps it the perfect temperature for him. His name is Gill.

### ⭐⭐⭐⭐⭐ Fluval P10
*by M***T on June 15, 2025*

Works perfect in the spec 3

## 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

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-03-03*