How do you secure this strip around the brewing jar?

I use a rubber band to secure mine. Velcro strips or gaffer's tape would also work. If you're using this to brew kombucha or a comparable drink, whatever you do, don't set the jar on the heating pad, which is what another user recommended. That's the last thing you'd want to do. Doing this offsets yeast growth and will ruin batches. The variance in temperature throughout the container will also be greater.

I'm thinking of this or the larger one for inside a little house I ordered for a feral cat, would it be adequate in frigid temps? It won't come insid

Not a good choice as a heating mat for cats, because it will heat to 2 degrees above the cats body temperature. I know this because my own old kitty, got on this mat when I was moving my dragonfruit babies from the mat to pot them up, said cat laid on it for the heat. I let her do it for quite a while, even tho I knew it would get too hot for her. She was on and off it, but it really would just get too hot. So I finally broke down and bought a pet mat and wrapped a couple shirts around it. That mat was a pet, K&H 15.75x25.5 and sold on Amazon for 36$. My old cat can lay on it all day without burning up. This plant product wasn't intended for that much heat, it did ok, but works better for the purpose it was designed for. Hope this helps, but I wouldn't do it myself, if only temporary until you could get a better "for pets" heated waterproof mat.

How long can it be plugged in for?

Mine stays plugged in literally 24/7. I use it to start pepper seedings in January so I can't shut it off. I have had no issues with the surface underneath it overheating.

I have a 1 gallon glass jar for brewing kombucha in. Does the size of the mat make a difference? If so, which size is best - 3" x 20" or 10" x 20"?

10 by 20 is the best surface coverage. wrap it around the jug, not jug on top

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VIVOSUN Durable Waterproof Seedling Heat Mat Warm Hydroponic Heating Pad 1-Pack 3"*20"

VIVOSUN Durable Waterproof Seedling Heat Mat Warm Hydroponic Heating Pad 1-Pack 3"*20"

Product ID: 643418028

Details

Brand
VIVOSUN
Colour
Black
Is Dishwasher Safe
No
Manufacturer
VIVOSUN
Material
Other
Net Quantity
1.0 Count

⚡6.5W ultra-low power usage

💧IP67 waterproof rating

🌡️68-86℉ optimal temp range

AR$340886

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Description

🔥 Grow smarter, not harder — your seedlings’ secret weapon! 🌱

VERSATILE USAGE - Perfect for seedlings, cuttings, terrariums, and even home brewing setups.
ENERGY EFFICIENT - Runs on just 6.5 watts, saving electricity while delivering consistent warmth.
PORTABLE FLEXIBLE - Soft, rollable design with carrying bag for effortless transport and storage.
DURABLE WATERPROOF - IP67-rated PVC surface ensures longevity and easy cleaning without damage.
PRECISION HEAT CONTROL - Maintains ideal 68-86℉ for faster germination and propagation.

The VIVOSUN Durable Waterproof Seedling Heat Mat is a professional-grade heating pad designed to maintain a stable 68-86℉ environment, accelerating seed germination and plant growth. Made from durable, waterproof PVC with advanced far-infrared technology, it ensures uniform heat without scorching roots. Energy-efficient at 6.5 watts and portable with a carrying bag, it’s ideal for indoor gardening, terrariums, and home brewing.

Specifications

ASIN	B073PTZCJ4
Best Sellers Rank	#262,943 in Garden & Outdoors ( See Top 100 in Garden & Outdoors ) #891 in Greenhouses & Plant Germination Equipment
Brand	VIVOSUN
Colour	Black
Customer Reviews	4.2 out of 5 stars 1,747 Reviews
Expected Blooming Period	Winter
Expected Planting Period	Spring
Item Weight	0.1 Kilograms
Manufacturer	VIVOSUN
Manufacturer Part Number	VS-330104
Material Feature	Natural
Material Features	Natural
Number of Items	1
Number of Pieces	1
Other Special Features of the Product	Waterproof
Plant or Animal Product Type	Herb
Product Care Instructions	water
Special Feature	Waterproof
UPC	615435161501
Unit Count	1.0 Count

Reviews

A**R

NICHT KAUFEN!!!!!

Nicht kaufen!!!!! Ich hab auch genug vom Austauschen, die Dinger sind Schrott!!!!!!

6.07.2026

J**E

Great works as should

Works well temp controller is the bomb,had other brand no temp controller and it got very hot and melted ,caution do not Sandwich any heat mat

22.11.2025

C**S

Não esquenta no meio

Não esquenta no meio. Dividindo o tapete retângulo em 3 partes, a do meio não esquenta, apenas as outras duas. E o calor é bem discreto.

29.04.2025

D**T

Only plugged in for 2 days.

So far this heating mat is working great. You have to play with the thermostat adjuster to get the correct temperature. I would recommend a thermostat to go inside of your seedling trays or someway to monitor actual soul temperature. That way you can adjust the heating mat accordingly.

25.12.2023

N**S

As a heated mat cant be faulted although smaller than I expected . Longevity is the key

It seems well made and does everything it says on the tin. Temperature maintains its setting and goes up plenty high enough. It does not get a 5 star as I cant yet say it continues to perform for season 2 and beyond

16.03.2026

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Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

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4 days ago

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AR$340886

Duties & taxes included

In stock

Sold byAmazon ArgentinaDelivered 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 Argentina.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

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