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Sounds to me like dnalot did some research AFTER the event, to work out what happened - and learned the linings melt way before the outer. I'm not a welder, but I do work hot metal and that seems unacceptable to me. What do the suppliers have to say?

That sounds a bit like a Chinese whisper version of "LBSC" the UK author /machinist who apparently started by upgrading and making toy steam locos as a kid with very limited resources, eventually revolutionising model loco construction by building 'real' engines, not toys. -Russ

"in the old days", I recall adding a thick copper gasket to make up for excessive skimming - usually required after repair of a crack... Possibly not really good practice, but cheap! -Russell

I got my 'powtran' brand vfd off eBay from a guy in Doncaster. It has the advantage that it can be set to 415v output in case your motor can't be set to star configuration. Not sure if they are still around though.

The poster with the bottle of 'thin' brasso... Maybe the abrasive has settled to the bottom. I found I needed to use a 'stick shaped object' to dig it off the bottom of my last can. Shaking had no effect. -russ

sorry for late reply..lost the thread... we are in agreement, no mechanical system is 100% efficient. There are losses in the 'movement' of the heat, so if you were able to measure the total energy input compared to the total usable output, there are losses. But for normal (ie, advertising!)...

Well, optimistic claims aside, reverse cycle air conditioning can be over 100 percent efficient, considering only the electrical input, because they are extracting heat from the environment, not converting electrical to heat. -russ.