approx age of the property? type of pipe work? pvc, copper, steel or other? Boiler type? type of heating systems they are i.e open vent, semi sealed or fully sealed, what material the radiators and hot press i.e is it copper system, qualpex or gun barrel as different methods to chemical flushing for different metal, make , model of boiler for chemical selection for cleansing as certain heat exchangers require different cleansing chemicals that suit.. as much info as possible
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