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Good post. There were two separate lines of water in the latest demonstration. One ran into and out of the E-cat, and then to a heat exchanger where it transferred heat to a second body of water.

The first water line then went to a drain. Meanwhile the 2nd body of water also went to another drain. One drain was inside, the other outside. It does strike me as odd that they didn't just run them to the same drain (why not if they are just water)?

I recall someone writing/calculating that 1.8 tons of water ran through the E-cat during the 'self-powered' portion of the demonstration. That would be a lot of water. Now, thinking through what you said, the hydrogen peroxide would have to be in this first water line, because the observers agree the heat was coming from the E-cat itself, not just appearing in the heat exchanger. This means the 2nd water line can be ruled out as far as anything suspicious goes.

You mention a 35% mix of hydrogen peroxide, but that would require almost 1000 lbs. of hydrogen peroxide in the water-in line if the 1.8 ton comment is correct. The E-cat itself weighed only ~200 lbs., so the hydrogen peroxide would have to have been fed in, not stored within the E-cat for this test.

I'm not enough of a chemist, so I defer to you and others: Could hydrogen peroxide be mixed in at a much more dilute level with a very large quantity of water and still provide a heating effect such as was observed? Otherwise, it doesn't seem terribly plausible that Rossi managed to plumb the water line and add a thousand pounds of hydrogen peroxide without anyone noticing. Conceivable? Maybe. Can anyone add more insight pro or con?

FWIW, I thought to check the James Randi ("The Great Randi") site to see if Rossi and his e-cat ever came up. It turns out that there are 50 pages in the forum about it: randi.org

I have only just started reading through it, but it looks like it's going to be interesting.

"I'm not enough of a chemist, so I defer to you and others: Could hydrogen peroxide be mixed in at a much more dilute level with a very large quantity of water and still provide a heating effect such as was observed?"

Simple answer......no. They use hydrogen peroxide as the fuel for the NASA "flying belts", but it is highly purified (I forget whether it is 90% or 99%, but of that order). The more dilute it is, the less the max available energy/time. You're not going to power a "flying belt" with the stuff from your medicine cabinet. Run that through the same catalyst used in the "flying belt", and all you'll get is some fizzy water (got to watch out that the oxygen released doesn't get to some combustibles, though).