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I recently had a Viessmann Vitodens 111-w storage combi boiler installed in my property but the electrician did not connect up the hive thermostat correctly. The central heating has 3 circuits, a UFH circuit for the kitchen (where the boiler lives), a zone for downstairs rads and a zone for...

I have house built in 2011 with 2 internal soil stacks. There is one main soil pipe under the ground floor that runs front to back on the right hand side of the property, and a connecting soil pipe that runs under the kitchen floor diagonally from left to right. The vent for the system is on the...