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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🔥 Stay warm, stay ahead — power your water heating with smart, sustainable energy!

SMART FREEZE PROTECTION - Ideal for livestock drinkers and outdoor tanks, preventing winter freeze automatically.
ENERGY EFFICIENT HEAT DUMP - Diverts excess renewable energy to heat water, reducing waste and lowering utility bills.
POWER YOUR OFF GRID LIFESTYLE - Seamlessly connects to batteries, solar panels, and wind turbines for eco-smart heating.
UNIVERSAL FIT INSTANT UPGRADE - 1-inch NPT flange fits standard US tanks or custom setups with ease.
CORROSION RESISTANT STAINLESS STEEL - Electropolished surface ensures durability and longevity in any water environment.

The Dernord 12V 300W Immersion Heater is a stainless steel, double U-type heating element designed for versatile water heating applications. Compatible with 12V DC power sources like batteries and renewable energy systems, it features a standard 1-inch NPT flange for easy installation in domestic or custom tanks. UL and cUL safety listed, it offers corrosion resistance and energy-efficient heating ideal for off-grid living, freeze protection, and eco-conscious users.

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Manufacturer	Dernord
Part number	DERNORDJF-15010302
Item Weight	311 g
Package Dimensions	24 x 5.31 x 4.39 cm; 311.84 g
Item model number	DERNORDJF-15010302
Size	12V 300W(Double U Type)
Colour	Silver
Material	Stainless Steel
Voltage	12 Volts
Wattage	300 watts
Item Package Quantity	1
Batteries included?	No
Batteries Required?	No

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

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