No directions came with my heater....How can I adjust the temp so that it actually sticks?

Use the Button by the outlet side and then press it, it will start to flash press until your at the proper temp then leave it. It will adjust itself

Can i adjust it to set to 78 degrees F for a betta fish?

Dear customer, 78 ℉ is ≈ 26℃ , designed temperature for this heater is 15~34℃，normally, suitable temperature for betta fish is 24~30℃（75~86℉）, we suggest you ask local fish store for more details.

What type of plastic is it made of?

The Plastic is durable, does no appear to be fiberglass filed plastic. How ever the one I purchased is sitting in a box it didn't last much more than a month. an alert message flashed and I removed it as soon as I noticed it. Replaced it with a Cobalt Neo-Therm Heater.

Why is this Heater flashing 00? Tried unplugging and resetting- still does not work.

It flashes till you set the temp you want then it stops. If it keeps flashing then you need to contact seller and send it back.

Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

Help Track order

Account Cart

Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

Help Track order

Account Cart

FREESEA Aquarium Fish Tank Heater: 50W Small Submersible Turtle Heater with Adjustable Temperature External Controller for Betta | Saltwater | Freshwater | 1-10 Gallon

FREESEA Aquarium Fish Tank Heater: 50W Small Submersible Turtle Heater with Adjustable Temperature External Controller for Betta | Saltwater | Freshwater | 1-10 Gallon

Product ID: 52830982

Details

Brand
FREESEA
Color
Submersible
Item Length
3.5 Inches
Material
Glass
Voltage
110 Volts

⚡50W precise heating power

🔒Dual auto shut-off safety system

🌡️Adjustable 63℉-94℉ external controller

€ 38.99

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Croatia.

Secure transaction

Description

🌊 Keep your aquatic world perfectly heated — because your fish deserve the best vibe.

SAFETY FIRST DESIGN - Auto shut-off activates if heater is exposed or water exceeds 94℉, protecting your aquatic friends.
REAL TIME LED DISPLAY - Digital temperature readout with error codes keeps you informed at a glance.
RELIABLE 24 7 SUPPORT - FREESEA’s dedicated customer service ensures your tank stays cozy and your worries minimal.
PRECISION HEATING POWER - 50W ensures stable warmth for 1-10 gallon tanks, perfect for bettas and turtles.
CUSTOM TEMPERATURE CONTROL - External controller lets you dial in the perfect aquatic climate from 63℉ to 94℉ with ease.

The FREESEA 50W Aquarium Fish Tank Heater is a compact, submersible device designed for 1-10 gallon freshwater and saltwater tanks. Featuring an external adjustable controller with a temperature range of 63℉ to 94℉, it offers precise climate control. Dual safety protections include automatic shut-off when exposed or overheating above 94℉. The digital LED display provides real-time temperature and error alerts, backed by responsive 24-hour customer support.

Specifications

ASIN	B075PSPCNY
ASIN	B075PSPCNY
Best Sellers Rank	#31,338 in Pet Supplies ( See Top 100 in Pet Supplies ) #53 in Aquarium Heaters
Brand Name	FREESEA
Color	Submersible Heater with External Controller
Customer Reviews	4.3 4.3 out of 5 stars (7,499)
Date First Available	September 17, 2017
Is Discontinued By Manufacturer	No
Item Length	3.5 Inches
Item model number	FS28-50W
Manufacturer	FREESEA
Manufacturer	FREESEA
Material Type	Glass
Model Number	FS28-50W
Part Number	4334822537
Product Dimensions	2.5 x 1.5 x 3.5 inches; 8.15 ounces
UPC	722970219243
Unit Count	1 Count
Voltage	110 Volts
Wattage	50 watts

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Meera L.

Smooth transaction and product arrived in perfect condition.

3 weeks ago

Reema J.

Perfect platform for hard-to-find items. Delivery was prompt.

1 month ago

View all Trustpilot reviews

Shop Global, Save with Desertcart

Value for Money

Competitive prices on a vast range of products

Shop Globally

Serving millions of shoppers across more than 100 countries

Enhanced Protection

Trusted payment options loved by worldwide shoppers

Customer Assurance

Trusted payment options loved by worldwide shoppers.

Desertcart App

Shop on the go, anytime, anywhere.

€ 38.99

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Croatia.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Anita G.

Good experience, but the tracking updates could be better.

2 months ago

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

View all Trustpilot reviews