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I have a ground floor apartment. The overflow pipe from the gas boiler condensing tank is plumbed into the under sink pipes via a complicated and difficult (impossible) route short of pulling out all the kitchen cabinets. There is a blow back that is caused by something happening in one of the...

I have owned from new, a ground floor apartment in a block that has two other apartments above. The condensing outlet for the gas boiler has been plumbed into the pipes under the sink. The condensing tank has been filling up and overflowing. The outlet pipe from the tank follows a complicated...