# Aquarium Heater Fluval Grzałka E 300W – Submersible Heater for Freshwater and Marine Tanks

**URL:** https://aio.lv/en/product--fluval-fv-7747--12038321
**Data updated:** 2026-03-12 16:47 (EET)
**Category:** Aquarium Supplies
**Manufacturer:** Fluval
**Manufacturer code:** FV-7747
**EAN:** 015561107747
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 49.99 €
**Prices and availability valid until:** 2026-07-19 23:59
**Price without VAT (21%):** 41.31 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--fluval-fv-7747--12038321

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 14.07.2026 | free |
| Pickup points | 17.07.2026 | 1.99 EUR |
| Courier delivery to door | 17.07.2026 | 4.99 EUR |

## Summary description

Fluval Grzałka E 300W is a submersible aquarium heater delivering 300 watts of heating power. Designed for maintaining stable water temperature in freshwater and marine tanks, it fits larger aquariums requiring reliable heat. The heater features durable construction for continuous operation, easy installation and temperature regulation suitable for tropical fish, coral, and aquatic plants.

## Long description

Fluval Grzałka E 300W is a submersible aquarium heater designed to provide steady, reliable heating for larger freshwater and marine tanks. Delivering 300 watts of power, this heater supports stable water temperatures for tropical fish, corals and aquatic plants. Built for continuous use, the unit combines robust construction with straightforward installation and simple temperature regulation to meet the needs of hobbyists and professional aquarists.
Advantages
The heater offers consistent heat output suitable for maintaining target temperatures in volume aquaria. Its submersible design ensures full immersion without reducing performance, and durable materials support long-term operation in both freshwater and saltwater environments. The device is engineered for easy mounting and adjustment, enabling reliable operation with minimal maintenance.
Suitable for
 Large freshwater aquariums housing tropical fish
 Marine tanks with corals and invertebrates requiring stable temperatures
 Aquariums with live aquatic plants that need controlled warmth
 Public displays or breeder tanks where continuous heating is essential
Key specifications
 Power output: 300 W
 Design: fully submersible heater
 Application: suitable for freshwater and marine aquaria
 Operation: continuous-duty capable for long-term use
 Mounting: in-tank mounting with adjustable bracket
 Temperature control: manual adjustment for setpoint regulation
How to use
Install the Fluval 300W heater fully submerged in the aquarium, positioning it near a circulation area to promote even temperature distribution. Secure the unit with the included bracket to a side or rear panel, avoiding direct contact with substrate or decorations. Set the desired temperature using the heater's adjustment control, then monitor water temperature with a reliable thermometer. Allow time for the heater to stabilize and verify uniform tank temperature before making further adjustments.
Usage recommendations
For reliable performance, pair the heater with adequate filtration and circulation to prevent hot spots. Periodically inspect the heater for signs of wear, secure mounting, and clean it as needed according to manufacturer guidance. Use a separate thermometer to verify set temperatures and perform gradual adjustments to avoid thermal stress on aquatic life.

## FAQ

### How much does the Fluval Grzałka E 300W aquarium heater cost, and is it available for purchase?

The price is 49.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 10 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 14.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All Fluval products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized Fluval service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

https://aio.lv/img/cache/product/12038321/67525585_large.webp