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markadams

Plumbers Arms member
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Gas Engineer
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Has anyone tried to clean a partially blocked secondary heat exchanger using system chemicals instead of removing and acid cleaning or replacing it.

Got a vokera procombi 85 he which goes cold unless the flow is very low.
 
Depends on whether it's the heating side sludged up or a scaled up hot water side. I've always had good results using fx2
 

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