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Originally Posted by Ruiner
...I question the Innovatek design in that it's small size may pose an inlet restriction and cavitation...
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There was a problem with the earlier design. It had a bit less interior space and a
side inlet which seemed to encourage a vortex to form, which would allow air to be drawn into the pump inlet unless "discouraged" with a piece of filter-foam.
This is not the same issue as cavitation.
As far as "small size" - hunh? You mean "small enough around the inlet to restrict flow"? I'd be surprised if even the earlier model restricted flow at all, compared to, say, the ID of a threaded barb adapter screwed into the inlet. It was a simple block of aluminum with a 30mm hole bored partway down through it. There was a 20mm hole in one side, which the pump inlet pushed into about 15mm - so only 15mm clearance sides (bottom shrouded, top unobstructed). Not sure how this would present much of a restriction to 1046/1048 flows.
In any case, the newer (current) model is a good deal larger inside, with room beneath the pump inlet as well as top and all sides. The major restriction would be the inside of the 1/4BSPT fitting on the top (10mm ID). No vortex and no apparent cavitation with an Eheim/Innovatek HPPS (essentially 1046 flow at 1250 pressures) in a relatively non-restrictive loop.