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.

Manufacturer	Dernord
Part Number	DERNORD-51
Package Dimensions	24 x 5 x 4.7 cm; 231.33 g
Manufacturer reference	DERNORD-51
Colour	silver
Material	Stainless Steel
Voltage	12 Volts
Wattage	150 watts
Item Package Quantity	1
Batteries included?	No
Batteries Required?	No
Item Weight	231 g

DERNORD 12V 150W Submersible Heater Stainless Steel Heating Element With NPSM Flange 1 Inch

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