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

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

Help Track order

Account Cart

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

Help Track order

Account Cart

DERNORD 12V 300W Immersion Heater Submersible Water Heater Element Stainless Steel Heating Element with 1 Inch NPSM Fitting Double U Type

DERNORD 12V 300W Immersion Heater Submersible Water Heater Element Stainless Steel Heating Element with 1 Inch NPSM Fitting Double U Type

Product ID: 24106484

Details

Brand
DERNORD
Color
Silver
Item Length
17.5
Material
Stainless
Voltage
12 volts

⚡300W high-efficiency heating output

🔋12V DC compatible - powers from batteries & renewables

🛠️1" NPSM flange - fits standard US tanks

E£ 4806

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

Description

🔥 Stay warm anywhere, anytime with power you control! 🔋

PRECISION FIT GUARANTEED - Standard 1-inch NPSM flange fits most US water tanks or custom setups with ease.
WATERPROOF SILICONE SEAL - Flexible sealing washer prevents leaks, ensuring reliable submersion and performance.
ROBUST STAINLESS STEEL BUILD - Electropolished surface ensures long-lasting corrosion resistance and sleek durability.
PLUG PLAY POWER FLEXIBILITY - Seamlessly connects to batteries, solar panels, and wind turbines for off-grid heating freedom.
SAFETY CERTIFIED PEACE OF MIND - UL and cUL listed to meet rigorous safety standards for worry-free operation.

The DERNORD 12V 300W Immersion Heater is a stainless steel, double U-type submersible heating element designed for 12V DC systems. It delivers efficient 300W heating, fits standard 1-inch NPSM water tanks, and is UL/cUL safety certified. Ideal for off-grid setups powered by batteries, solar, or wind, it features a waterproof silicone seal and durable electropolished surface for reliable, long-term use.

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

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Yusuf A.

Fantastic experience overall. Will recommend to friends and family.

1 month ago

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

View all Trustpilot reviews

Shop Global, Save with Desertcart

Value for Money

Competitive prices on a vast range of products

Shop Globally

Serving millions of shoppers across more than 100 countries

Enhanced Protection

Trusted payment options loved by worldwide shoppers

Customer Assurance

Trusted payment options loved by worldwide shoppers.

Desertcart App

Shop on the go, anytime, anywhere.