# Aquarium Heater Fluval T300 300W for Aquariums up to 300 L

**URL:** https://aio.lv/en/product--fluval-fv-14434--12253369
**Data updated:** 2026-04-14 14:27 (EEST)
**Category:** Aquarium Supplies
**Manufacturer:** Fluval
**Manufacturer code:** FV-14434
**EAN:** 015561014434
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 45.49 €
**Prices and availability valid until:** 2026-07-17 23:59
**Price without VAT (21%):** 37.60 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--fluval-fv-14434--12253369

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 09.07.2026 | free |
| Pickup points | 14.07.2026 | 1.99 EUR |
| Courier delivery to door | 14.07.2026 | 4.99 EUR |

## Summary description

Fluval T300 is a 300W submersible aquarium heater designed for tanks up to 300 liters. It provides stable temperature regulation for freshwater and marine aquariums, features an integrated thermostat with adjustable setpoint and safety cut-off, and is intended to maintain optimal conditions for fish, invertebrates, and planted systems.

## Long description

The Fluval T300 300W submersible aquarium heater is designed to maintain stable water temperature in freshwater and marine aquariums up to 300 litres. It integrates a compact heating tube and a user-adjustable thermostat with a clear setpoint range, providing consistent thermal conditions for tropical fish, invertebrates and planted aquaria. The unit includes a safety cut-off feature that helps prevent overheating and is built for continuous submerged operation with corrosion-resistant materials.
Advantages
The Fluval T300 offers precise temperature control through an integrated adjustable thermostat and delivers uniform heating across the aquarium. Its submersible design allows discreet installation inside the tank and reduces temperature stratification. The heater is built for continuous use and includes an automatic safety cut-off to reduce the risk of damage from overheating. Materials and construction are chosen for compatibility with both freshwater and marine environments.
Suitable for
Freshwater aquariums up to 300 L
Marine and reef tanks within the same volume range
Tropical community fish and invertebrate systems
Planted aquaria requiring stable temperatures
Aquarium setups needing a submersible heater with adjustable setpoint
When it may not be suitable
This heater is not intended for aquariums larger than the recommended 300 litres; using it in significantly larger tanks may result in insufficient warming and uneven temperatures. It may also be unnecessary for coldwater species or environments that do not require active heating.
Key specifications
Power: 300 W
Recommended aquarium volume: up to 300 L
Type: submersible electric heater with integrated thermostat
Operation: suitable for freshwater and marine aquaria
Control: adjustable temperature setpoint with safety cut-off
How to use
Mount the Fluval T300 fully submerged according to the manufacturer’s mounting guidance, ideally positioned near moderate water flow to ensure even heat distribution. Set the desired temperature using the adjustable control and allow the aquarium to stabilise for several hours before adding sensitive livestock. Regularly inspect the heater and its power cord for damage, and follow routine maintenance and safety checks. If the heater’s safety cut-off engages, disconnect power and allow the unit to cool before investigating the cause.
What to consider before purchase
Confirm aquarium volume does not exceed 300 litres
Decide whether submersible installation inside the tank fits your layout and aesthetics
Ensure compatibility with freshwater or marine setups
Plan for placement near water flow to promote even heating
Usage recommendations
For reliable temperature control, position the heater where circulation passes over it and monitor water temperature with an independent thermometer. Set the heater slightly higher than the target temperature and verify with a separate gauge to account for factory calibration variance. Regular checks and preventative maintenance help maintain stable conditions for fish, invertebrates and plants.

## FAQ

### How much does the Fluval T300 Aquarium Heater 300W cost, and is it available for purchase?

The price is 45.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 11 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 09.07.2026 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/12253369/68520215_large.webp