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

Dernord Immersion Heater | Desertcart EGYPT

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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الحساب عربة التسوق

E£ 4910

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Sold byAmazon EGYPTDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔥 Stay warm, stay independent – power your water your way! 🔋

RAPID 300 W HEATING - Delivers fast, reliable warmth to your water with energy-efficient performance.
POWER YOUR HEAT ANYWHERE - Runs seamlessly on batteries, solar panels, hydro, or wind energy for off-grid freedom.
WATERPROOF SILICONE SEAL - Flexible, durable sealing washer guarantees leak-proof operation every time.
UNIVERSAL 1 NPSM FITTING - Fits standard US water tanks or custom setups with ease—no hassle installation.
DURABLE STAINLESS STEEL BUILD - Electropolished surface resists corrosion and ensures long-lasting use.

The DERNORD 12V 300W Immersion Heater is a robust stainless steel submersible heating element designed for versatile off-grid power sources like batteries and solar panels. Featuring a universal 1-inch NPSM flange and a waterproof silicone seal, it ensures easy installation and reliable, corrosion-resistant performance for your water heating needs.

Specifications

ASIN	B017VT68XA
Best Sellers Rank	#118,496 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #176 in Water Heater Replacement Parts
Brand	DERNORD
Brand Name	DERNORD
Color	Silver
Customer Reviews	4.3 out of 5 stars 122 Reviews
Item Length	17.5 centimeters
Item Weight	11 ounces
Manufacturer	DERNORD
Material	Stainless Steel
Material Type	Stainless Steel
Model Number	DERNORDJF-15010302
Number of Items	1
Part Number	DERNORDJF-15010302
UPC	717080640254
Unit Count	1 Count
Voltage	12 volts
Wattage	300 watts

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E£ 4910

Duties & taxes included

In stock

Sold byAmazon EGYPTDelivered 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 EGYPT.

Secure transaction

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DERNORD Immersion Heater

Details

Details

Description

Specifications

Common Questions