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  • i have a Vokera linea 28 combi boiler and we have had three heat exchangers fitted in 4 years .This was done because hot water temp was fluctuating and eventually went cold altogether.Also some rads were cold at the bottom.engineer told me that the system needs flushing.what is the best way to do this and if i use something like fernox or senntinel will it harm the system . i have a chrome towel rail fitted in the bathroom. what is the best sludge remover to use. thanks eddie007
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