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 700W Immersion Heater Submersible Water Heater Element Stainless Steel Heating Element with 1 Inch NPSM Fitting Double U Type

DERNORD 12V 700W Immersion Heater Submersible Water Heater Element Stainless Steel Heating Element with 1 Inch NPSM Fitting Double U Type

Product ID: 490810470

Details

Brand
DERNORD
Color
White
Item Length
6.89 Inches
Material
Stainless
Voltage
12 Volts

⚡700W high power output

🔋12V DC compatible with batteries & renewables

🛠️1" NPSM flange fits standard US tanks

¥10498

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Description

🔥 Stay warm, stay powered — anywhere, anytime! ⚡

SMART FREEZE PROTECTION - Ideal for preventing winter freeze in livestock drinkers and outdoor tanks
UNIVERSAL 1 NPSM FITTING - Easy installation on standard US water tanks or custom setups
DURABLE STAINLESS STEEL BUILD - Electropolished surface resists corrosion for long-lasting performance
POWERFUL 700 W HEATING ELEMENT - Rapidly warms water with efficient energy use
VERSATILE 12 V DC COMPATIBILITY - Seamlessly integrates with batteries, solar panels, and wind turbines for off-grid freedom

The DERNORD 12V 700W Immersion Heater is a robust stainless steel submersible heating element designed for versatile off-grid applications. Compatible with 12V DC power sources like batteries and renewable energy systems, it features a standard 1" NPSM flange for easy installation in US water tanks. Its electropolished corrosion-resistant surface ensures durability, making it perfect for domestic hot water, biodiesel production, home brewing, and freeze protection in outdoor water containers.

Specifications

ASIN	B0BCW51N7T
Best Sellers Rank	#201,040 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #387 in Water Heater Replacement Parts
Brand	DERNORD
Brand Name	DERNORD
Color	White
Customer Reviews	4.7 out of 5 stars 7 Reviews
Item Length	6.89 inches
Manufacturer	DERNORD
Material	Stainless Steel
Material Type	Stainless Steel
Number of Items	1
Number of Packs	1
Unit Count	1 Count
Voltage	12 volts
Wattage	700 watts

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¥10498

Duties & taxes included

In stock

Sold byAmazon JapanDelivered 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 Japan.

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