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Looking at fitting a Glowworm Micron before april (which I have experience of) or a Suprima HE condenser, (which I havent), it's got a cast iron primary exchanger but doesn't say on the pdf instructions what the secondary is made of, looks like aluminium in the picture, anybody had any experience of fitting/servicing repairing these, what do you reckon to a CI exchanger on a condenser !!! apart from the fact that Potterton dont come out for four days if the thing wont fire up from day one that is.