I used the Eden 104, small and low wattage. Koolance makes some nice pumps with res also.
The eden is low flow rated, but with a good head. I placed them in series, and it gives me the same performence in a loop as the L20. But it is half the size, and half the wattage.
As long as it is low wattage, there is no problem submerging it. If it is high wattage, you will only add aditional heat it your loop.
A Hydor L20 is for me a high wattage pump.
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If it get's hot, it needs to be watercooled!
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