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 NPT Fitting Double U Type

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

Product ID: 485933827

Details

Brand
DERNORD
Colour
Silver
Item length
175
Material
Stainless
Voltage
12 Volts

🔋12V DC power compatibility

⚙️1" NPT standard fitting

🛡️Electropolished stainless steel

Description

🔥 Power your water heating off-grid with smart, stainless steel efficiency!

ALL SEASON RELIABILITY - Prevents freezing in winter and supports biodiesel production or home brewing with ease.
VERSATILE 12 V DC POWER - Seamlessly integrates with batteries, solar panels, and wind turbines for off-grid heating solutions.
UNIVERSAL 1 NPT FLANGE - Fits standard US water tanks or custom setups, ensuring hassle-free installation.
ENERGY EFFICIENT HEATING - 300W power optimizes battery use, perfect for caravans, boats, and remote workshops.
DURABLE STAINLESS STEEL BUILD - Electropolished surface resists corrosion, guaranteeing long-lasting performance.

The Dernord 12V 300W Immersion Heater is a corrosion-resistant, stainless steel heating element designed for 12V DC systems. Featuring a universal 1" NPT fitting, it fits most US water tanks and custom heaters. Ideal for off-grid applications like caravans, boats, and renewable energy setups, it delivers reliable, energy-efficient heating while preventing freezing and supporting alternative uses such as biodiesel production.

Specifications

ASIN	B017VT68XA
Best Sellers Rank	796,505 in DIY & Tools ( See Top 100 in DIY & Tools ) 2,472 in Water Heaters & Parts 36,369 in Large Appliances Parts & Accessories
Brand	DERNORD
Colour	Silver
Customer Reviews	4.3 4.3 out of 5 stars (133)
Item Length	175 Millimetres
Item Weight	11 Ounces
Manufacturer	Dernord
Material Type	Stainless Steel
UPC	717080640254
Unit Count	1.0 count
Voltage	12 Volts
Wattage	300 watts

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