1)Efficiency:82%; 2) SIT valve, firebox, burner, gas logs, black louver, blower G33 features: 1) 33'' small size2) ... 0003) Efficiency: 82%4) Fuel: Natural gas/LPG5) High-temperature glass6) SIT valve, firebox, burner, gas logs, black louver, blower7) D-Vent8) ... 0003) Efficiency 82%4) Fuel: Natural gas/LPG5) High-temperature glass6) SIT valve, firebox, burner, gas logs, black louver, blower7) D-Vent8) ...