In message , Keith D
writes
Some time ago I posted a question on how to clean a combi heat exchanger.
I resolved the issue with remarkable ease using powered citric acid at 20%
solution in water at 85 c. Cleaned it in about 40 minutes.
I was so impressed that I removed and cleaned all my right angle compression
joints!!!

I'm pleased to hear this as I need to descale the hot water heat
exchanger in mine, how did you circulate the solution? How could you
tell when it was done?

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