Will this heater work for a 450 gal tank to keep water from freezing?

Most likely NOT, Is the tank indoors or outdoors? you will need at least a 800watt element, make sure yo have a thermostat to control the temp...

I will be connecting this directly to my solar panel. My solar panel puts out 12-21 volts. Will 21v damage the element?

The heater is actually two twelve volt elements connected in parallel by factory jumpers. Much of the time, this load would pull down a 300 watt panel to very low voltage resulting in poor heating. You will probably find the higher voltage and lower amps of putting the elements in series (change the factory jumpers) across your panel yields better results (heating) and solves the possibility of damaging the elements. The heater then becomes 24 V and 300 W.

What is the resistance of the element aka how many ohms is it

The element which is made of sus304 has 0.48 ohms. Thank you

what size bulkhead do folks use for this? Any links to one?

12 volt 300 watt will take a long time to heat up i use a 48 volt 1000 watt element with batterys

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DERNORD 12V 300W Immersion Heater Submersible Water Heater Element Stainless Steel Heating Element with 1 Inch NPSM Fitting Double U Type

Product ID: 24106484

Details

Brand
DERNORD
Color
silver
Item Length
6.89 inches
Material
Stainless
Voltage
12 volts

⚡300W rapid heating output

🔋12V DC power compatibility

🛠️1" NPSM flange fits standard tanks

₨907

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Description

🔥 Power your water heating game with sleek, off-grid efficiency! 🔋

BUILT TO LAST SAFE - UL and cUL certified with electropolished stainless steel for durability and peace of mind.
FAST EFFICIENT HEATING - 300W stainless steel element delivers quick, reliable warmth exactly when you need it.
POWER YOUR HEAT ANYWHERE - Runs seamlessly on batteries, solar panels, or wind turbines for off-grid freedom.
WATERPROOF SEAL INCLUDED - Flexible silicone washer guarantees leak-proof, worry-free submersion every time.
UNIVERSAL FIT ZERO HASSLE - 1-inch NPSM flange ensures easy installation on USA standard or custom water tanks.

The DERNORD 12V 300W Immersion Heater is a durable, stainless steel submersible heating element designed for versatile off-grid use. Featuring a 1-inch NPSM flange for universal tank compatibility, it operates safely at 12 volts DC with UL and cUL certification. Its electropolished surface and included silicone sealing washer ensure long-lasting, waterproof performance ideal for solar, battery, or wind-powered setups.

Specifications

ASIN	B0761L2Q8M
Best Sellers Rank	#64,783 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #81 in Water Heater Replacement Parts
Brand	DERNORD
Brand Name	DERNORD
Color	silver
Customer Reviews	4.3 out of 5 stars 141 Reviews
Item Length	6.89 inches
Item Weight	8.16 ounces
Manufacturer	DERNORD
Material	Stainless Steel
Material Type	Stainless Steel
Number of Items	1
Part Number	DERNORD-51
UPC	717643521518
Unit Count	1 Count
Voltage	12 volts
Wattage	150 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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₨907

Duties & taxes included

In stock

Sold byAmazon SeychellesDelivered 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 Seychelles.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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