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Is it acceptable to use a rubber boot to make the connection between the top of the water heater and the pvc vent pipe?
The book is where you should be looking for the answer I would not think so.Most systems have specific instuctions and restrictions not to mention code and more important your home safety
rubber boot is not what i should have written
what i mean more specifically, is a flexible pvc coupling
sched 40 should be ok but refer to manuf specs
The water heater should come with the right connector and literature to explain the appropriate vent material and footage. As well as appropriate requirements for vent terminations, combustion air, and condensation disposal.