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 Immersion Heater

Product ID: 24106484

Details

Brand
DERNORD
Color
Silver
Item Length
17.5
Material
Stainless
Voltage
12 volts

⚡300W rapid heating output

🔋12V DC power compatibility

🛠️1" NPSM flange fits US standard tanks

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Description

🔥 Power your water heating with off-grid confidence! 🔋

UNIVERSAL FIT - 1-inch NPSM flange ensures hassle-free installation on standard or custom water tanks.
DURABLE SAFE - Electropolished stainless steel surface resists corrosion and meets UL/cUL safety standards.
WATERPROOF SEAL - Includes flexible silicone sealing washer for leak-proof, worry-free submersion.
RAPID HEAT BOOST - 300W stainless steel element delivers fast, efficient water heating exactly when you need it.
PLUG PLAY POWER - Seamlessly connects to batteries, solar panels, and wind turbines for off-grid heating freedom.

The DERNORD 12V 300W Immersion Heater is a robust stainless steel submersible heating element designed for 12V DC systems. Featuring a universal 1-inch NPSM flange, it fits standard US water tanks and custom setups alike. UL and cUL certified for safety, it offers rapid heating with a durable electropolished surface and a waterproof silicone seal, making it ideal for off-grid and renewable energy applications.

Specifications

ASIN	B017VT68XA
Best Sellers Rank	#118,496 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #176 in Water Heater Replacement Parts
Brand	DERNORD
Brand Name	DERNORD
Color	Silver
Customer Reviews	4.3 out of 5 stars 122 Reviews
Item Length	17.5 centimeters
Item Weight	11 ounces
Manufacturer	DERNORD
Material	Stainless Steel
Material Type	Stainless Steel
Model Number	DERNORDJF-15010302
Number of Items	1
Part Number	DERNORDJF-15010302
UPC	717080640254
Unit Count	1 Count
Voltage	12 volts
Wattage	300 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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B/.87

Duties & taxes included

In stock

Sold byAmazon PanamaDelivered 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 Panama.

Secure transaction

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