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 Power

🌊Stainless Steel

🔌12V Connectivity

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1883140₫

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Sold byAmazon VietnamDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔥 Heat Up Your Life with DERNORD!

CUSTOM FIT - 1-inch NPSM flange fits standard and custom tanks.
SAFETY FIRST - UL and cUL listed for your peace of mind.
DURABLE DESIGN - Crafted from electropolished stainless steel for longevity.
POWERFUL HEATING - Experience rapid heating with 700 watts of energy.
VERSATILE COMPATIBILITY - Easily connects to batteries, solar panels, and more.

The DERNORD 12V 700W Immersion Heater is a robust and versatile heating solution designed for various applications. With its stainless steel construction and compatibility with multiple power sources, this heater ensures efficient and safe heating for your water needs.

Specifications

ASIN	B0BCW51N7T
Best Sellers Rank	#97,110 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #165 in Water Heater Replacement Parts
Brand Name	DERNORD
Color	White
Customer Reviews	4.6 4.6 out of 5 stars (6)
Item Length	6.89 Inches
Manufacturer	DERNORD
Material Type	Stainless Steel
Unit Count	1.0 Count
Voltage	12 Volts
Wattage	700 watts

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