Gas Rapid Heater Thermal Efficiency 24÷32KW, Efficiency 106.6÷111%, Hot Water Production 24÷32 l/min, with Double Primary and Secondary Exchangers, Built-in Control Panel, Compatible with Natural Gas and LPG, Possibility of Stacking up to 16 of units, Antifreeze Protection of Machine at Temperatures up to -40°C, Chimney up to 110m, GAR Certified