What is an IPI ignition system?

Intermittent Pilot Ignition is an electronic system, which uses an electrode to ignite the pilot gas. In turn, the pilot flame lights the main burner gas. The term Intermittent is used because the pilot burner flame is only present when the main burner is operating. When the main burner is off the pilot is also off. The IPI system ensures the pilot flame extends over the burner for immediate ignition and secondly conserves energy when the appliance is not in operation.
Intellifire, an ignition system exclusively featured in Heatilator, Heat & Glo & Quadra-Fire products, is an energy-saving pilot ignition system for gas fireplaces and inserts. It provides an ignition flame only when needed and has a battery backup system that supplies power to spark the ignition flame in the event of a power outage.