Sure, the accuracy of the test was one enthusiast counting to ten and
estimating the height of the head of the tops of the hoses over the
elevation of the pump. But, by the ten count the two ten-quart buckets
definitely were full.
Anyway, although mostly of academic interest, we see that it doesn't
take but a fraction of one psi to flow water very fast unrestricted
through small orifices. I haven't tried to measure it, but it may be
that the thermostat, even when open, has more restriction than two .470"
orifices at the hose fittings, and if so, this would create a little
more backpressure in the water jackets. Bill Hoddinott
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