I would like to top mount the element, but a small amount of the tube won't be covered with water. Will that be a problem? Denord please.

Yes it will . Needs to be covered with water at all times to keep it from overheating . Overheating will damage the unit .needs to be at least 4to6 inches under water at all times .p

What if you have lower amperage? instead of 12, maybe 3-5 amps. will it still work? just not get as hot?

Its 12 volts, not 12 amps. If you have 12v and 3 - 5 amps you will get maybe 36 - 60 watts. It won't get very hot.

Can this be used hooked straight to a 100w solar panel?

150w element 100w panel no offense do the math. It will heat but at 12v 150w takes 4 hrs to heat 5 gallons of water so I doubt your getting a solid 5 hrs full output. Not recommended but might limp through.

Material	Stainless Steel
Voltage	12 Volts
Item Length	6.89 Inches
Brand	DERNORD
Color	silver
Wattage	150 watts
Item Weight	0.51 Pounds
UPC	717643521518
Manufacturer	DERNORD
Part Number	DERNORD-51
Item Weight	8.2 ounces
Is Discontinued By Manufacturer	Yes
Size	12V 150W
Item Package Quantity	1
Batteries Included?	No
Batteries Required?	No

12V 150W Immersion Heater Submersible Water Heater Element Stainless Steel Heating Element with 1 Inch NPSM Flange

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