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Thank you Beerlover - just the information I needed. Appreciate your time. Don.

Hi, new to forum and have possibly daft question: I need to replace the secondary heat exchanger on a Vaillant VCW242. The original plastic one is leaking (as I beleive they are notorious for..) I have read the thread http://www.diynot.com/forums/viewtopic.php?t=37559 which is extremely helpful...