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 Heater, Submersible Betta Heater | Small Fish Tank 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
4.48 ounces
Wattage
25 watts

💧100% submersible design

🔥25W rapid heating power

🌡️Preset 78℉ ±3℉ precision

€ 21.13

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.

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Description

🔥 Keep your betta cozy and your tank flawless—hassle-free heating that’s always on point!

COMPACT VERSATILE FIT - Sleek mini design fits seamlessly in 1-6 gallon tanks, perfect for desktop or acrylic aquariums.
INSTANT VISUAL FEEDBACK - Dual LED indicators show heating status—red for warming, green for steady state, so you’re always in the know.
SAFETY FIRST SUBMERSION - Fully submersible with built-in safeguards to protect your fish and heater longevity.
EFFORTLESS TEMPERATURE CONTROL - Plug in and relax—preset 78℉ keeps your betta’s environment perfectly stable without any fiddling.
BONUS THERMOMETER STRIP INCLUDED - Track your tank’s temperature at a glance and never second-guess your betta’s comfort.

The PULACO 25W Mini Aquarium Submersible Betta Heater is engineered for small tanks (1-6 gallons), delivering precise, preset 78℉ temperature control with ±3℉ accuracy. Its fully submersible design ensures safe, efficient heating, complemented by dual LED indicators and a free thermometer strip for easy monitoring. Backed by a 12-month warranty and 24-hour support, it’s the smart, reliable choice for maintaining optimal betta fish habitat.

Specifications

ASIN	B081VN41FQ
Best Sellers Rank	#4,007 in Pet Supplies ( See Top 100 in Pet Supplies ) #6 in Aquarium Heaters
Brand Name	PULACO
Color	Transparent
Customer Reviews	4.3 4.3 out of 5 stars (12,024)
Included Components	heater
Item Length	4.9 inches
Item Weight	4.48 ounces
Manufacturer	Guangzhou Purelake Trading Co.,Ltd
Model Number	25 Watt-Under 6 gallon
Number of Items	1
Number of Packs	1
Part Number	PULACO-1
UPC	763032017889
Unit Count	1 Count
Warranty Description	1 YEAR
Wattage	25 watts

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€ 21.13

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

Abdullah B.

Great price for an authentic product. Fast international shipping too!

3 weeks ago

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

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