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Originally Posted by fhorst
as far as I'm aware, there is not such test availible.
All submerged pumps will transfer their full wattage into the water.
All inline pumps just a small portion (3 to 5 % ?) as only the axis and the impeller + impeller housing are in contact with the water.
I did a test once, with an inline pump, 35 watts, made a closed loop with only a small res.
After 2 days of running, the water was only slightly above ambient (total of water 300cc)
I also did a test with submerging the pump. After 1 hour, the water was about 20 degrees above ambient. (this time it was little over one litre)
After this home test I decided that for me I will use only small low wattage pumps submerged. (like the small ones from Koolance 3 watt's each)
Bigger pumps only go inline!
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Ah, well that was helpful. Thx dude!