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 Bolivia

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Bs.665

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Sold byAmazon BoliviaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔥 Power your off-grid lifestyle with sleek, reliable heat! 🔋

SAFETY CERTIFIED - UL and cUL listed to guarantee reliable and safe operation under demanding conditions.
OFF GRID READY POWER - Seamlessly integrates with batteries, solar panels, and wind turbines for eco-smart heating.
FLEXIBLE INSTALLATION - Standard 1" NPSM flange fits most US water tanks or custom setups with ease.
WATERPROOF SEAL INCLUDED - Comes with a silicone sealing washer for a leak-proof, flexible fit every time.
ROBUST STAINLESS STEEL BUILD - Electropolished surface ensures durability and corrosion resistance for long-lasting performance.

The DERNORD 12V 300W Immersion Heater is a stainless steel, submersible heating element designed for off-grid energy systems. Featuring a universal 1" NPSM fitting, UL safety certifications, and a waterproof silicone seal, it delivers efficient and durable heating compatible with batteries, solar, and wind power setups.

Specifications

ASIN	B017VT68XA
Best Sellers Rank	#108,310 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #197 in Water Heater Replacement Parts
Brand	DERNORD
Brand Name	DERNORD
Color	Silver
Customer Reviews	4.3 out of 5 stars 119 Reviews
Item Length	175 Millimeters
Item Weight	11 Ounces
Manufacturer	DERNORD
Material	Stainless Steel
Material Type	Stainless Steel
Model Number	DERNORDJF-15010302
Part Number	DERNORDJF-15010302
UPC	717080640254
Unit Count	1.0 Count
Voltage	12 Volts
Wattage	300 watts

Reviews

P**R

13.06.2020

Y**N

4.09.2022

M**T

29.09.2024

A**.

16.08.2017

T**Y

15.12.2019

R**S

6.05.2021

G**A

24.03.2021

D**Y

7.06.2022

T**.

4.02.2023

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Buy anything from 5,000+ international stores. One checkout price. No surprise fees. Join 2M+ shoppers on Desertcart.

Bs.665

Duties & taxes included

In stock

Sold byAmazon BoliviaDelivered 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 Bolivia.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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Smooth transaction and product arrived in perfect condition.

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