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 Immersion Heater Submersible Water Heater Element Stainless Steel Heating Element with 1 Inch NPSM Fitting

Product ID: 571351224

Details

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

⚡12V DC power compatibility

🔧1 inch NPSM standard fitting

🛡️UL & cUL safety certified

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VT23902

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Description

🔥 Heat smarter, not harder — power your water your way!

SAFETY FIRST - UL and cUL listings guarantee reliable, certified performance you can trust.
UNIVERSAL FIT - 1 inch NPSM flange ensures hassle-free installation on standard or custom water tanks.
DURABLE SLEEK - Electropolished stainless steel surface resists corrosion and looks premium.
WATERPROOF SEAL - Flexible silicone washer provides a leak-proof, worry-free setup every time.
PLUG PLAY POWER - Seamlessly connects to batteries, solar panels, and wind turbines for off-grid heating.

The DERNORD 12V 500W Immersion Heater is a robust stainless steel submersible heating element designed for versatile off-grid use. Featuring a standard 1 inch NPSM fitting, it easily integrates with batteries, solar, and wind power systems. UL and cUL certified for safety, it delivers reliable heating with a corrosion-resistant electropolished surface and a flexible silicone seal for waterproof installation.

Specifications

ASIN	B0BCW28DNW
ASIN	B0CJXSPHWC
Best Sellers Rank	#220,025 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #78 in Immersion Rods
Brand Name	DERNORD
Color	White
Customer Reviews	4.2 4.2 out of 5 stars (8)
Customer reviews	4.2 4.2 out of 5 stars (8)
Date First Available	28 May 2022
Item Length	6.89 Inches
Item Weight	0.33 Kilograms
Manufacturer	DERNORD
Material Type	Stainless Steel
Voltage	12 Volts
Wattage	500 watts

Reviews

T**M

Works but it isn't 500 watts. Meter rates it at around 640 watts. It works just fine but I wasn't expecting the extra 140 watts on my solar system.. Would buy again

13.09.2025

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VT23902

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In stock

Sold byAmazon VanuatuDelivered 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 Vanuatu.

Secure transaction

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