Oh, something I wanted to ask to Cathar (I believe he had something to do with the design of the PA series rad) and to Marci.

How would an all aluminium PA series radiator compare - a few adjustments can be granted, but essentially the same product.

In other words, is there anything at all in Koolances statements about aluminium. I'm happy to accept - thanks to the studies done - that a combination of their materials, manufacturing process and design do not produce a superior radiator.