If it can horizontally, does that mean it can be placed under gravel/substrate?

No it can’t be under the gravel

I want this for a tank with a beta - no water current. Is this going to work you think?

There is NO fish in existance that can survive and thrive without filtration...even bettas. If you have a betta and no filter, thus no water movement, you are killing your fish. Please...do some research. Don't fall prey to the misinformation that they little guys can live in a puddle. Thats as bad as saying a goldfish can live in a bowl.

Will this overheat a one gallon tank?

I bought it for my 1.5 gallon tank and it made my tank 93 degrees it does not shut off like it's suppose too!

It says under 6 gallons. So if i have a 6 gallon round that a bette stays in would it be good for that?

Bettas should have a MINIMUM of a 3 gallon tank WITH filtration AND heater. It is a myth that they can survive and THRIVE in anything smaller. They really should have a 5 gallon tank but if the tank is well planted with live plants to help with nitrate removal, they can live in a 3 gallon. Please do research on this. There are lots of good videos on youtube on how to take proper care of a betta and what is flat out cruelty. A bowl is basically the equivalent to keeping your dog in a closet and never scooping their poop. Except bettas have to breath it too.

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PULACO 25Watt Mini Aquarium Submersible Betta Heater with Free Thermometer Strip for 1-6 Gallon Fish Tanks (Preset Temperature 78℉)

PULACO 25Watt Mini Aquarium Submersible Betta Heater with Free Thermometer Strip for 1-6 Gallon Fish Tanks (Preset Temperature 78℉)

Product ID: 174013013

Details

Brand
PULACO
Color
Transparent
Item Length
4.9 Inches
Item Weight
0.28 Pounds
Wattage
25 watts

💧Fully submersible design

🔥25Watt precise heating

🌡️Preset 78℉ constant temp

€ 18.44

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Description

🔥 Keep your betta chill and your tank thrill-ready!

SAFETY FIRST - Automatic on/off indicator lights with ±3℉ accuracy keep your aquatic friends safe and cozy.
COMPACT VERSATILE - Mini 4.9-inch size fits perfectly in 1-6 gallon tanks, ideal for desktop or small aquarium setups.
PLUG PLAY PRECISION - Preset 78℉ temperature ensures a stable, stress-free environment for your betta—no fiddling required.
PEACE OF MIND WARRANTY - Backed by a 12-month warranty and 24/7 support, because your betta deserves the best.
EFFORTLESS INSTALLATION - Mount vertically or horizontally—quick setup means more time enjoying your vibrant fish.

The PULACO 25Watt Mini Aquarium Submersible Betta Heater is a compact, fully submersible heater designed for 1-6 gallon tanks. It maintains a preset temperature of 78℉ with ±3℉ accuracy, featuring automatic on/off indicator lights for safety. Easy to install vertically or horizontally, it comes with a free thermometer strip and is backed by a 12-month warranty and responsive customer service.

Specifications

ASIN	B081VN41FQ
Best Sellers Rank	#5,248 in Pet Supplies ( See Top 100 in Pet Supplies ) #7 in Aquarium Heaters
Brand Name	PULACO
Color	Transparent
Customer Reviews	4.3 4.3 out of 5 stars (11,995)
Included Components	heater
Item Length	4.9 Inches
Item Weight	0.28 Pounds
Manufacturer	PULACO
Model Number	25 Watt-Under 6 gallon
Part Number	PULACO-1
Smart Home Compatibility	Not Smart Home Compatible
UPC	763032017889
Unit Count	1.0 Count
Warranty Description	1 YEAR
Wattage	25 watts

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€ 18.44

Duties & taxes included

In stock

Sold byAmazon SpainDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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

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TrustScore 4.5 | 7,300+ reviews

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