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

🎯±3°F precise temp control

💧100% submersible design

🔥25W rapid heating power

C$1187

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Description

🔥 Keep your betta cozy and your tank flawless—hassle-free heating mastery!

SAFETY FIRST DESIGN - Fully submersible with built-in durability and 12-month warranty for peace of mind.
SMART INDICATOR LIGHTS - Red heats up, green maintains—know your tank’s status at a glance.
OPTIMIZED WATER CIRCULATION - Works best with pumps or filters to keep your aquatic environment thriving.
COMPACT VERSATILE PLACEMENT - Fits 1-6 gallon tanks, installs vertically or horizontally with ease.
EFFORTLESS TEMPERATURE STABILITY - Preset at 78℉ for perfect betta comfort—no fiddling needed.

The PULACO 25W Mini Aquarium Heater is a compact, fully submersible device designed for 1 to 6 gallon tanks. It delivers rapid, precise heating preset at 78℉ with ±3°F accuracy, featuring smart red/green indicator lights for easy monitoring. Its versatile installation options and durable build, backed by a 12-month warranty, make it the go-to choice for betta enthusiasts seeking reliable, maintenance-free temperature control.

Specifications

ASIN	B081VN41FQ
Best Sellers Rank	#4,118 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 (12,032)
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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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.

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C$1187

Duties & taxes included

In stock

Sold byAmazon NicaraguaDelivered 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 Nicaragua.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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