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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12V 500W Immersion Heater Submersible Water Heater Element Stainless Steel Heating Element with 1 Inch NPSM Fitting Double U Type

Product ID: 504360711

Details

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

⚡12V DC power compatibility

🔥500W rapid heating output

🔩1" NPSM flange fits US standard tanks

$70.51

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Description

🔥 Power your water heating with smart, sustainable energy! ⚡

UNIVERSAL FIT - 1" NPSM flange designed to fit standard US water tanks or custom setups effortlessly.
PLUG PLAY POWER - Seamlessly connects to batteries, solar panels, and wind turbines for eco-smart heating.
ENERGY EFFICIENT BACKUP - Preheats water ahead of gas heaters, reducing gas usage and cutting energy bills.
SMART FREEZE PROTECTION - Ideal for preventing winter freeze in livestock drinkers and outdoor ponds with simple thermostat control.
CORROSION RESISTANT STAINLESS STEEL - Electropolished surface ensures durability and longevity in all water types.

The DERNORD 12V 500W Immersion Heater is a stainless steel, corrosion-resistant submersible heating element designed for versatile use in water tanks, caravans, boats, and renewable energy setups. Featuring a 1" NPSM flange for easy installation, it operates on 12V DC power compatible with batteries, solar panels, and wind turbines. UL and cUL safety listed, it offers reliable freeze protection and energy-efficient preheating to optimize your water heating system.

Specifications

Asin	B0BCW28DNW
Best Sellers Rank	#131,017 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement) #241 in Water Heater Replacement Parts
Brand Name	DERNORD
Color	White
Customer Reviews	4.2 4.2 out of 5 stars (8) 4.2 out of 5 stars
Item Length	6.89 Inches
Item Weight	0.33 Kilograms
Manufacturer	DERNORD
Material Type	Stainless Steel
Unit Count	1.0 Count
Voltage	12 Volts
Wattage	500 watts

Reviews

User

Works.. Just abit more then 500 watts

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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$70.51

Duties & taxes included

In stock

Sold byAmazon USADelivered 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 USA.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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