hey I got an idea thats not a guess!
I read one con to submersible pumps is that it adds extra heat to the system by being cooled to the water.
so by this, it means atleast SOME heat must escape to the atmosphere. right?
With a non submerible least a little always does....how much depends apon the design. A submersible will be cooled completely by the water...no choice in the matter- all the heat has nowhere else to go. Mag or direct drive pumps release varying amounts of heat to the water. I beleive Cathars testing showed that the D4, having a fully encapsulated armature, put almost all of its 15-16 watts of electrical heat into the loop via its face plate, while a pumps like the Little Giant MD series have an open armature and are fan cooled so most of the heat is removed via air.
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