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Potteron Suprima 80l heat exchanger?

I've just had the Service engineer tell me that my boiler (see above) needs a new Heat exchanger because it is scaled up. The cost - £600. Is it possible for me to either: replace the exchanger myself or
descale it?

Pete
Pete Cumberland, November 2007
I'll descale it for half that if youre close enough to me (Kent)

Plumbdoctor, November 2007
USE FERNOX DS-40 DESCALER-FOLLOW INSTRUCTIONS CAREFULLY SHOULD BE OKAY --CAN BE DONE DIY FIDDLY

WP, November 2007