Fine if you can get a smooth flow if water across all surfaces, but
turbulence is the problem more than cavitation. If turbulence develops and
you get eddies recirculating past the same bit of surface you will get hot
spots. Using restrictor plates is so much an established practice where
thermostats are removed that I would be very suspicious any company that
says they aren't required as part of the sales pitch for a high-volume pump!
But then I *am* a dinosaur :o)
PaulH.
----- Original Message -----
> The Stewart people say a big no to restrictors !
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