Until recently, gas hearth appliances could be described as negative pressure venting and systems designed to release adequate heat to prevent problems from condensation of water vapor produced by combustion. The introduction of high efficiency furnace technology to the hearth industry, however, now means that there are gas hearth appliances that have positive pressure (mechanical) venting with the expectation of condensation of combustion-produced water vapor and adds the use of approved plastic piping (PVC). The venting system of super high efficiency gas appliances has significantly lower operating temperature, but must withstand the corrosive nature of the condensate. This session will explain an overview of the applications, technology, and installation considerations for super-efficient fireplaces – including PVC venting considerations, controls, and simple troubleshooting.