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I have an Alpha 240p combi boiler which needs replacing. Before I do this, I think the entire system needs to be flushed to remove the sludge. What is best product and process to use ?

I have an old multipoint boiler which needs replacing. Before I do this, I think the entire system needs to be flushed to remove the sludge. What is best product and process to use ?

I have an Alpha240P boiler. When I try to draw the domestic hot water, the diagphram in the boiler activates ok and the boiler and pump start up but the majority of the boiler circulatory hot water continues to run around the central heating system with very little going through the domestic hot...