DVE heaters that exceed 80 percent efficiency and Mantis fireplaces that exceed 90 percent efficiency employ advanced electronics, hot-surface ignition, and power venting through multi-stage heat exchangers to achieve these lofty efficiencies.
Multi-Function Systems use a small electronically generated spark to ignite the burner. This eliminates the standing pilot, which saves about 800 BTU/Hour on a direct vent system.
Because they can operate with battery backup, multi-function systems can provide heat during a poweroutage.
Multi-function systems include their own remote controls. Available on some direct-vend fireplaces andvent-free burners (FQ-VFSV).
IP Systems use a small electronically generated spark to ignite a pilot, which ignites the burner. This eliminates the standing pilot, which saves about 800-1100 BTU/Hour.
Most IP systems include their own remote controls - either an on/off (for outdoor products) or thermostat (used mostly on direct-vent and vent-free fireplaces).
Millivolt systems include a standing pilot light that ignites the burner. The pilot also heats a small thermopile, which generates a tiny electric current (measured in millivolts) - just enough to operate the controls on the gas valve when you switch it on or when a thermostat calls for heat. Because a Millivolt system does not require electricity, it allows the fireplace or heater to operate without interruption during power outages.
